The Experts below are selected from a list of 360 Experts worldwide ranked by ideXlab platform
Haoshen Zhou - One of the best experts on this subject based on the ideXlab platform.
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oxygen vacancy promising highly reversible phase transition in layered cathodes for sodium ion Batteries
Nano Research, 2021Co-Authors: Kezhu Jiang, Shaohua Guo, Haoshen Zhou, Wei Kong Pang, Xueping Zhang, Tiancheng Fang, Shaofei Wang, Fangwei Wang, Xiaoyu ZhangAbstract:Phase transition is common during (de)-intercalating layered sodium oxides, which directly affects the structural stability and electrochemical performance. However, the artificial control of phase transition to achieve advanced Sodium-Ion Batteries is lacking, since the remarkably little is known about the influencing factor relative to the sliding process of transition-metal slabs upon sodium release and uptake of layered oxides. Herein, we for the first time demonstrate the manipulation of oxygen vacancy concentrations in multinary metallic oxides has a significant impact on the reversibility of phase transition, thereby determining the sodium storage performance of cathode materials. Results show that abundant oxygen vacancies intrigue the return of the already slide transition-metal slabs between O3 and P3 phase transition, in contrast to the few oxygen vacancies and resulted irreversibility. Additionally, the abundant oxygen vacancies enhance the electronic and ionic conductivity of the Na0.9Ni0.3Co0.15Mn0.05Ti0.5O2 electrode, delivering the high initial Coulombic efficiency of 97.1%, large reversible capacity of 112.7 mAh·g−1, superior rate capability upon 100 C and splendid cycling performance over 1,000 cycles. Our findings open up new horizons for artificially manipulating the structural evolution and electrochemical process of layered cathodes, and pave a way in designing advanced Sodium-Ion Batteries.
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a new layered sodium molybdenum oxide anode for full intercalation type sodium ion Batteries
Journal of Materials Chemistry, 2015Co-Authors: Shaohua Guo, Haoshen Zhou, Kai Zhu, Songyan Bai, Yingjin Wei, Gang ChenAbstract:A new layered Na0.3MoO2 exhibits a reversible capacity of 146 mA h g−1, remarkable cycling stability and good rate capability for sodium half-cells. And a Na0.3MoO2//Na0.8Ni0.4Ti0.6O2 full intercalation-type Sodium-Ion cell is fabricated and it displays an excellent cycling stability. These results indicate that molybdenum-based oxide is a promising anode material for Sodium-Ion Batteries.
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high performance symmetric sodium ion Batteries using a new bipolar o3 type material na0 8ni0 4ti0 6o2
Energy and Environmental Science, 2015Co-Authors: Shaohua Guo, Yang Ren, Haoshen Zhou, Masayoshi Ishida, Pan Liu, Mingwei Chen, Tao ZhangAbstract:Based on low-cost and rich resources, Sodium-Ion Batteries have been regarded as a promising candidate for next-generation energy storage Batteries in the large-scale energy applications of renewable energy and smart grids. However, there are some critical drawbacks limiting its application, such as safety and stability problems. In this work, a stable symmetric Sodium-Ion battery based on the bipolar, active O3-type material, Na0.8Ni0.4Ti0.6O2, is developed. This bipolar material shows a typical O3-type layered structure, containing two electrochemically active transition metals with redox couples of Ni4+/Ni2+ and Ti4+/Ti3+, respectively. This Na0.8Ni0.4Ti0.6O2-based symmetric cell exhibits a high average voltage of 2.8 V, a reversible discharge capacity of 85 mA h g−1, 75% capacity retention after 150 cycles and good rate capability. This full symmetric cell will greatly contribute to the development of room-temperature Sodium-Ion Batteries with a view towards safety, low cost and long life, and it will stimulate further research on symmetric cells using the same active materials as both cathode and anode.
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an ultrastable anode for long life room temperature sodium ion Batteries
Angewandte Chemie, 2014Co-Authors: Yang Ren, Shaohua Guo, Yanbei Zhu, Dongdong Xiao, Yumin Qian, Haoshen ZhouAbstract:Sodium-Ion Batteries are important alternative energy storage devices that have recently come again into focus for the development of large-scale energy storage devices because sodium is an abundant and low-cost material. However, the development of electrode materials with long-term stability has remained a great challenge. A novel negative-electrode material, a P2-type layered oxide with the chemical composition Na2/3Co1/3Ti2/3O2, exhibits outstanding cycle stability (ca. 84.84 % capacity retention for 3000 cycles, very small decrease in the volume (0.046 %) after 500 cycles), good rate capability (ca. 41 % capacity retention at a discharge/charge rate of 10 C), and a usable reversible capacity of about 90 mAh g(-1) with a safe average storage voltage of approximately 0.7 V in the sodium half-cell. This P2-type layered oxide is a promising anode material for Sodium-Ion Batteries with a long cycle life and should greatly promote the development of room-temperature Sodium-Ion Batteries.
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a high capacity low cost layered sodium manganese oxide material as cathode for sodium ion Batteries
Chemsuschem, 2014Co-Authors: Shaohua Guo, Yanbei Zhu, Haoshen Zhou, Masayoshi Ishida, Zelang Jian, Pan Liu, Xianwei Guo, Mingwei ChenAbstract:A layered sodium manganese oxide material (NaMn3 O5 ) is introduced as a novel cathode materials for Sodium-Ion Batteries. Structural characterizations reveal a typical Birnessite structure with lamellar stacking of the synthetic nanosheets. Electrochemical tests reveal a particularly large discharge capacity of 219 mAh g(-1) in the voltage rang of 1.5-4.7 V vs. Na/Na(+) . With an average potential of 2.75 V versus sodium metal, layered NaMn3 O5 exhibits a high energy density of 602 Wh kg(-1) , and also presents good rate capability. Furthermore, the diffusion coefficient of sodium ions in the layered NaMn3 O5 electrode is investigated by using the galvanostatic intermittent titration technique. The results greatly contribute to the development of room-temperature Sodium-Ion Batteries based on earth-abundant elements.
Shaohua Guo - One of the best experts on this subject based on the ideXlab platform.
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oxygen vacancy promising highly reversible phase transition in layered cathodes for sodium ion Batteries
Nano Research, 2021Co-Authors: Kezhu Jiang, Shaohua Guo, Haoshen Zhou, Wei Kong Pang, Xueping Zhang, Tiancheng Fang, Shaofei Wang, Fangwei Wang, Xiaoyu ZhangAbstract:Phase transition is common during (de)-intercalating layered sodium oxides, which directly affects the structural stability and electrochemical performance. However, the artificial control of phase transition to achieve advanced Sodium-Ion Batteries is lacking, since the remarkably little is known about the influencing factor relative to the sliding process of transition-metal slabs upon sodium release and uptake of layered oxides. Herein, we for the first time demonstrate the manipulation of oxygen vacancy concentrations in multinary metallic oxides has a significant impact on the reversibility of phase transition, thereby determining the sodium storage performance of cathode materials. Results show that abundant oxygen vacancies intrigue the return of the already slide transition-metal slabs between O3 and P3 phase transition, in contrast to the few oxygen vacancies and resulted irreversibility. Additionally, the abundant oxygen vacancies enhance the electronic and ionic conductivity of the Na0.9Ni0.3Co0.15Mn0.05Ti0.5O2 electrode, delivering the high initial Coulombic efficiency of 97.1%, large reversible capacity of 112.7 mAh·g−1, superior rate capability upon 100 C and splendid cycling performance over 1,000 cycles. Our findings open up new horizons for artificially manipulating the structural evolution and electrochemical process of layered cathodes, and pave a way in designing advanced Sodium-Ion Batteries.
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a new layered sodium molybdenum oxide anode for full intercalation type sodium ion Batteries
Journal of Materials Chemistry, 2015Co-Authors: Shaohua Guo, Haoshen Zhou, Kai Zhu, Songyan Bai, Yingjin Wei, Gang ChenAbstract:A new layered Na0.3MoO2 exhibits a reversible capacity of 146 mA h g−1, remarkable cycling stability and good rate capability for sodium half-cells. And a Na0.3MoO2//Na0.8Ni0.4Ti0.6O2 full intercalation-type Sodium-Ion cell is fabricated and it displays an excellent cycling stability. These results indicate that molybdenum-based oxide is a promising anode material for Sodium-Ion Batteries.
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high performance symmetric sodium ion Batteries using a new bipolar o3 type material na0 8ni0 4ti0 6o2
Energy and Environmental Science, 2015Co-Authors: Shaohua Guo, Yang Ren, Haoshen Zhou, Masayoshi Ishida, Pan Liu, Mingwei Chen, Tao ZhangAbstract:Based on low-cost and rich resources, Sodium-Ion Batteries have been regarded as a promising candidate for next-generation energy storage Batteries in the large-scale energy applications of renewable energy and smart grids. However, there are some critical drawbacks limiting its application, such as safety and stability problems. In this work, a stable symmetric Sodium-Ion battery based on the bipolar, active O3-type material, Na0.8Ni0.4Ti0.6O2, is developed. This bipolar material shows a typical O3-type layered structure, containing two electrochemically active transition metals with redox couples of Ni4+/Ni2+ and Ti4+/Ti3+, respectively. This Na0.8Ni0.4Ti0.6O2-based symmetric cell exhibits a high average voltage of 2.8 V, a reversible discharge capacity of 85 mA h g−1, 75% capacity retention after 150 cycles and good rate capability. This full symmetric cell will greatly contribute to the development of room-temperature Sodium-Ion Batteries with a view towards safety, low cost and long life, and it will stimulate further research on symmetric cells using the same active materials as both cathode and anode.
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an ultrastable anode for long life room temperature sodium ion Batteries
Angewandte Chemie, 2014Co-Authors: Yang Ren, Shaohua Guo, Yanbei Zhu, Dongdong Xiao, Yumin Qian, Haoshen ZhouAbstract:Sodium-Ion Batteries are important alternative energy storage devices that have recently come again into focus for the development of large-scale energy storage devices because sodium is an abundant and low-cost material. However, the development of electrode materials with long-term stability has remained a great challenge. A novel negative-electrode material, a P2-type layered oxide with the chemical composition Na2/3Co1/3Ti2/3O2, exhibits outstanding cycle stability (ca. 84.84 % capacity retention for 3000 cycles, very small decrease in the volume (0.046 %) after 500 cycles), good rate capability (ca. 41 % capacity retention at a discharge/charge rate of 10 C), and a usable reversible capacity of about 90 mAh g(-1) with a safe average storage voltage of approximately 0.7 V in the sodium half-cell. This P2-type layered oxide is a promising anode material for Sodium-Ion Batteries with a long cycle life and should greatly promote the development of room-temperature Sodium-Ion Batteries.
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a high capacity low cost layered sodium manganese oxide material as cathode for sodium ion Batteries
Chemsuschem, 2014Co-Authors: Shaohua Guo, Yanbei Zhu, Haoshen Zhou, Masayoshi Ishida, Zelang Jian, Pan Liu, Xianwei Guo, Mingwei ChenAbstract:A layered sodium manganese oxide material (NaMn3 O5 ) is introduced as a novel cathode materials for Sodium-Ion Batteries. Structural characterizations reveal a typical Birnessite structure with lamellar stacking of the synthetic nanosheets. Electrochemical tests reveal a particularly large discharge capacity of 219 mAh g(-1) in the voltage rang of 1.5-4.7 V vs. Na/Na(+) . With an average potential of 2.75 V versus sodium metal, layered NaMn3 O5 exhibits a high energy density of 602 Wh kg(-1) , and also presents good rate capability. Furthermore, the diffusion coefficient of sodium ions in the layered NaMn3 O5 electrode is investigated by using the galvanostatic intermittent titration technique. The results greatly contribute to the development of room-temperature Sodium-Ion Batteries based on earth-abundant elements.
Liquan Chen - One of the best experts on this subject based on the ideXlab platform.
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anthraquinone derivative as high performance anode material for sodium ion Batteries using ether based electrolytes
Green Energy & Environment, 2018Co-Authors: Yuejun Ding, Liquan Chen, Xuejie HuangAbstract:Abstract Organic materials, especially the carbonyl compounds, are promising anode materials for room temperature Sodium-Ion Batteries owing to their high reversible capacity, structural diversity as well as eco-friendly synthesis from bio-mass. Herein, we report a novel anthraquinone derivative, C14H6O4Na2 composited with carbon nanotube (C14H6O4Na2-CNT), used as an anode material for Sodium-Ion Batteries in ether-based electrolyte. The C14H6O4Na2-CNT electrode delivers a reversible capacity of 173 mAh g−1 and an ultra-high initial Coulombic efficiency of 98% at the rate of 0.1 C. The capacity retention is 82% after 50 cycles at 0.2 C and a good rate capability is displayed at 2 C. Furthermore, the average Na insertion voltage of 1.27 V vs. Na+/Na makes it a unique and safety battery material, which would avoid Na plating and formation of solid electrolyte interface. Our contribution provides new insights for designing developed organic anode materials with high initial Coulombic efficiency and improved safety capability for Sodium-Ion Batteries.
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pitch derived amorphous carbon as high performance anode for sodium ion Batteries
Energy Storage Materials, 2016Co-Authors: Liquan Chen, Xuejie HuangAbstract:Abstract Carbonaceous materials hold the most promising application among all anode materials for Sodium-Ion Batteries (SIBs) because of the high storage capacity and good cycling stability. However, the high cost and the low initial Coulombic efficiency limit their further commercialization. Herein, an amorphous carbon material was fabricated through direct pyrolysis of low-cost pitch and phenolic resin at heat treatment temperatures between 1200 and 1600 °C. The electrochemical performances of the amorphous carbon were systematically investigated in SIBs with inexpensive Al foil as current collector and environmentally benign aqueous sodium alginate as binder. By optimizing the carbonization temperature and precursor, we achieved an initial Coulombic efficiency of 88% – the highest reported so far for carbon-based anodes in SIBs with a high reversible capacity of 284 mA h g − 1 and excellent cycling performance. It was found that both the carbonization temperature and the mass ratio of pitch to phenolic resin have significant impact on the local structure of amorphous carbon, which leads to various electrochemical behaviors. When coupled with an air-stable O3-Na 0.9 [Cu 0.22 Fe 0.30 Mn 0.48 ]O 2 cathode, the full cell shows excellent electrochemical performance with an initial Coulombic efficiency of 80%, a good cycling stability and an energy density of 195 Wh/kg. This contribution provides a new approach for the development of low-cost Sodium-Ion Batteries.
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a novel high capacity positive electrode material with tunnel type structure for aqueous sodium ion Batteries
Advanced Energy Materials, 2015Co-Authors: Yuesheng Wang, Zhenzhong Yang, Liquan Chen, Jue Liu, Xiaoqing Yang, Xuejie HuangAbstract:Aqueous Sodium-Ion Batteries have shown desired properties of high safety characteristics and low-cost for large-scale energy storage applications such as smart grid, because of the abundant sodium resources as well as the inherently safer aqueous electrolytes. Among various Na insertion electrode materials, tunnel-type Na0.44MnO2 has been widely investigated as a positive electrode for aqueous Sodium-Ion Batteries. However, the low achievable capacity hinders its practical applications. Here, a novel sodium rich tunnel-type positive material with a nominal composition of Na0.66[Mn0.66Ti0.34]O2 is reported. The tunnel-type structure of Na0.44MnO2 obtained for this compound is confirmed by X-ray diffraction and atomic-scale spherical aberration-corrected scanning transmission electron microscopy/electron energy-loss spectrum. When cycled as positive electrode in full cells using NaTi2(PO4)3/C as negative electrode in 1 m Na2SO4 aqueous electrolyte, this material shows the highest capacity of 76 mAh g−1 among the Na insertion oxides with an average operating voltage of 1.2 V at a current rate of 2 C. These results demonstrate that Na0.66[Mn0.66Ti0.34]O2 is a promising positive electrode material for rechargeable aqueous Sodium-Ion Batteries.
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novel copper redox based cathode materials for room temperature sodium ion Batteries
Chinese Physics B, 2014Co-Authors: Shuyin Xu, Yong-sheng Hu, Xiaoyan Wu, Yunming Li, Liquan ChenAbstract:Layered oxides of P2-type Na0.68Cu0.34Mn0.66O2, P2-type Na0.68Cu0.34Mn0.50Ti0.16O2, and O'3-type NaCu0.67Sb0.33O2 were synthesized and evaluated as cathode materials for room-temperature Sodium-Ion Batteries. The first two materials can deliver a capacity of around 70 mAh/g. The Cu2+ is oxidized to Cu3+ during charging, and the Cu3+ goes back to Cu2+ upon discharging. This is the first demonstration of the highly reversible change of the redox couple of Cu2+/Cu3+ with high storage potential in secondary Batteries.
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a zero strain layered metal oxide as the negative electrode for long life sodium ion Batteries
Nature Communications, 2013Co-Authors: Yuesheng Wang, Liquan Chen, Xiaoqing Yang, Jianming Bai, Ruijuan Xiao, Xuejie HuangAbstract:Anode materials in Sodium-Ion Batteries can undergo significant volume change upon sodium insertion and extraction, leading to deteriorated cycling performance. Wang et al. report a layered metal oxide anode with zero-strain characteristics, which may lead to extended battery cycle life.
Yong-sheng Hu - One of the best experts on this subject based on the ideXlab platform.
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sodium vanadium titanium phosphate electrode for symmetric sodium ion Batteries with high power and long lifespan
Nature Communications, 2017Co-Authors: Dongxue Wang, Yong-sheng Hu, Gang Chen, Qiang Fu, Ditty Dixon, Natalia Bramnik, F Fauth, Helmut Ehrenberg, Fei DuAbstract:Sodium-Ion Batteries operating at ambient temperature hold great promise for use in grid energy storage owing to their significant cost advantages. However, challenges remain in the development of suitable electrode materials to enable long lifespan and high rate capability. Here we report a sodium super-ionic conductor structured electrode, sodium vanadium titanium phosphate, which delivers a high specific capacity of 147 mA h g−1 at a rate of 0.1 C and excellent capacity retentions at high rates. A symmetric Sodium-Ion full cell demonstrates a superior rate capability with a specific capacity of about 49 mA h g−1 at 20 C rate and ultralong lifetime over 10,000 cycles. Furthermore, in situ synchrotron diffraction and X-ray absorption spectroscopy measurement are carried out to unravel the underlying sodium storage mechanism and charge compensation behaviour. Our results suggest the potential application of symmetric Batteries for electrochemical energy storage given the superior rate capability and long cycle life. Discovering suitable electrodes is a challenge for the development of Sodium-Ion Batteries. Here the authors demonstrate a high-performance symmetric battery based on Na2VTi(PO4)3, highlighting its potential application in a smart grid.
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a p2 na0 67co0 5mn0 5o2 cathode material with excellent rate capability and cycling stability for sodium ion Batteries
Journal of Materials Chemistry, 2016Co-Authors: Xingguo Qi, Yong-sheng Hu, Xianlong Zhou, Xiaoqing Chen, Xu Zhang, Zhen ZhouAbstract:Sodium ion Batteries are considered as next-generation energy storage devices; however, stable cathode materials are highly desirable and challenging for sodium ion Batteries. Herein, we report the preparation of a layered cathode material, P2-Na0.67Co0.5Mn0.5O2, with a hierarchical architecture, through a facile and simple sol–gel route. X-ray diffraction (XRD) and high resolution transmission electron microscopy elucidated a well-defined P2-type phase structure, and in situ XRD measurements provided further evidence about the structural stability during desodiation/sodiation. Benefiting from the structural stability, the cathode material delivered a high discharge capacity of 147 mA h g−1 at 0.1C rate, and excellent cyclic stability with nearly 100% capacity retention over at least 100 cycles at 1C. More importantly, 88 mA h g−1 was maintained when the electrode was cycled at a very high rate of 30C, and almost half of its capacity was retained over 2000 cycles, which outperforms all the reported P2-type cathode materials. With outstanding electrochemical performance and structural flexibility, the P2-Na0.67Co0.5Mn0.5O2 cathode material will promote the practical applications of sodium ion Batteries.
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ti substituted tunnel type na 0 44 mno 2 oxide as a negative electrode for aqueous sodium ion Batteries
Nature Communications, 2015Co-Authors: Yuesheng Wang, Shuyin Xu, Xiqian Yu, Yong-sheng Hu, Ruimin Qiao, Wanli Yang, Kisuk Kang, Zhenzhong Yang, Lin Gu, Hong LiAbstract:Aqueous Sodium-Ion Batteries could be a potential solution for large-scale energy storage, but the conventional negative electrodes are not efficient. Here, the authors report a titanium-substituted tunnel-type Na0.44MnO2 material as a promising negative electrode for aqueous Sodium-Ion Batteries.
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novel copper redox based cathode materials for room temperature sodium ion Batteries
Chinese Physics B, 2014Co-Authors: Shuyin Xu, Yong-sheng Hu, Xiaoyan Wu, Yunming Li, Liquan ChenAbstract:Layered oxides of P2-type Na0.68Cu0.34Mn0.66O2, P2-type Na0.68Cu0.34Mn0.50Ti0.16O2, and O'3-type NaCu0.67Sb0.33O2 were synthesized and evaluated as cathode materials for room-temperature Sodium-Ion Batteries. The first two materials can deliver a capacity of around 70 mAh/g. The Cu2+ is oxidized to Cu3+ during charging, and the Cu3+ goes back to Cu2+ upon discharging. This is the first demonstration of the highly reversible change of the redox couple of Cu2+/Cu3+ with high storage potential in secondary Batteries.
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Room-temperature stationary Sodium-Ion Batteries for large-scale electric energy storage
Energy and Environmental Science, 2013Co-Authors: Huilin Pan, Yong-sheng Hu, Liquan ChenAbstract:Room-temperature stationary Sodium-Ion Batteries have attracted great attention particularly in large-scale electric energy storage applications for renewable energy and smart grid because of the huge abundant sodium resources and low cost. In this article, a variety of electrode materials including cathodes and anodes as well as electrolytes for room-temperature stationary Sodium-Ion Batteries are briefly reviewed. We compare the difference in storage behavior between Na and Li in their analogous electrodes and summarize the sodium storage mechanisms in the available electrode materials. This review also includes some new results from our group and our thoughts on developing new materials. Some perspectives and directions on designing better materials for practical applications are pointed out based on knowledge from the literature and our experience. Through this extensive literature review, the search for suitable electrode and electrolyte materials for stationary Sodium-Ion Batteries is still challenging. However, after intensive research efforts, we believe that low-cost, long-life and room-temperature Sodium-Ion Batteries would be promising for applications in large-scale energy storage system in the near future.
Xuejie Huang - One of the best experts on this subject based on the ideXlab platform.
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anthraquinone derivative as high performance anode material for sodium ion Batteries using ether based electrolytes
Green Energy & Environment, 2018Co-Authors: Yuejun Ding, Liquan Chen, Xuejie HuangAbstract:Abstract Organic materials, especially the carbonyl compounds, are promising anode materials for room temperature Sodium-Ion Batteries owing to their high reversible capacity, structural diversity as well as eco-friendly synthesis from bio-mass. Herein, we report a novel anthraquinone derivative, C14H6O4Na2 composited with carbon nanotube (C14H6O4Na2-CNT), used as an anode material for Sodium-Ion Batteries in ether-based electrolyte. The C14H6O4Na2-CNT electrode delivers a reversible capacity of 173 mAh g−1 and an ultra-high initial Coulombic efficiency of 98% at the rate of 0.1 C. The capacity retention is 82% after 50 cycles at 0.2 C and a good rate capability is displayed at 2 C. Furthermore, the average Na insertion voltage of 1.27 V vs. Na+/Na makes it a unique and safety battery material, which would avoid Na plating and formation of solid electrolyte interface. Our contribution provides new insights for designing developed organic anode materials with high initial Coulombic efficiency and improved safety capability for Sodium-Ion Batteries.
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advanced sodium ion Batteries using superior low cost pyrolyzed anthracite anode towards practical applications
Energy Storage Materials, 2016Co-Authors: Xiaohui Rong, Xuejie Huang, Liqua CheAbstract:Abstract Energy storage technologies are the core technology for smooth integration of renewable energy into the grid. Among which Sodium-Ion Batteries show great promise due to the potential low cost originated from the abundant resources and wide distribution of sodium. However, the anode still remains great challenge for the commercialization of Sodium-Ion Batteries. Here we report a pyrolyzed anthracite (PA) anode material with superior low cost and high safety through one simple carbonization process. The PA anode material shows promising sodium storage performance demonstrated by prototype pouch cells with a practical energy density of 100 Wh kg −1 , good rate and cycling performance. Furthermore, the high safety of pouch cells with PA anode was also proved by a series of safety experiments. These desirable properties of the PA anode can meet the requirements for practical applications and pave the way for the industrial production of low-cost and high-safety Sodium-Ion Batteries for large-scale electrical energy storage.
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pitch derived amorphous carbon as high performance anode for sodium ion Batteries
Energy Storage Materials, 2016Co-Authors: Liquan Chen, Xuejie HuangAbstract:Abstract Carbonaceous materials hold the most promising application among all anode materials for Sodium-Ion Batteries (SIBs) because of the high storage capacity and good cycling stability. However, the high cost and the low initial Coulombic efficiency limit their further commercialization. Herein, an amorphous carbon material was fabricated through direct pyrolysis of low-cost pitch and phenolic resin at heat treatment temperatures between 1200 and 1600 °C. The electrochemical performances of the amorphous carbon were systematically investigated in SIBs with inexpensive Al foil as current collector and environmentally benign aqueous sodium alginate as binder. By optimizing the carbonization temperature and precursor, we achieved an initial Coulombic efficiency of 88% – the highest reported so far for carbon-based anodes in SIBs with a high reversible capacity of 284 mA h g − 1 and excellent cycling performance. It was found that both the carbonization temperature and the mass ratio of pitch to phenolic resin have significant impact on the local structure of amorphous carbon, which leads to various electrochemical behaviors. When coupled with an air-stable O3-Na 0.9 [Cu 0.22 Fe 0.30 Mn 0.48 ]O 2 cathode, the full cell shows excellent electrochemical performance with an initial Coulombic efficiency of 80%, a good cycling stability and an energy density of 195 Wh/kg. This contribution provides a new approach for the development of low-cost Sodium-Ion Batteries.
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a novel high capacity positive electrode material with tunnel type structure for aqueous sodium ion Batteries
Advanced Energy Materials, 2015Co-Authors: Yuesheng Wang, Zhenzhong Yang, Liquan Chen, Jue Liu, Xiaoqing Yang, Xuejie HuangAbstract:Aqueous Sodium-Ion Batteries have shown desired properties of high safety characteristics and low-cost for large-scale energy storage applications such as smart grid, because of the abundant sodium resources as well as the inherently safer aqueous electrolytes. Among various Na insertion electrode materials, tunnel-type Na0.44MnO2 has been widely investigated as a positive electrode for aqueous Sodium-Ion Batteries. However, the low achievable capacity hinders its practical applications. Here, a novel sodium rich tunnel-type positive material with a nominal composition of Na0.66[Mn0.66Ti0.34]O2 is reported. The tunnel-type structure of Na0.44MnO2 obtained for this compound is confirmed by X-ray diffraction and atomic-scale spherical aberration-corrected scanning transmission electron microscopy/electron energy-loss spectrum. When cycled as positive electrode in full cells using NaTi2(PO4)3/C as negative electrode in 1 m Na2SO4 aqueous electrolyte, this material shows the highest capacity of 76 mAh g−1 among the Na insertion oxides with an average operating voltage of 1.2 V at a current rate of 2 C. These results demonstrate that Na0.66[Mn0.66Ti0.34]O2 is a promising positive electrode material for rechargeable aqueous Sodium-Ion Batteries.
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a zero strain layered metal oxide as the negative electrode for long life sodium ion Batteries
Nature Communications, 2013Co-Authors: Yuesheng Wang, Liquan Chen, Xiaoqing Yang, Jianming Bai, Ruijuan Xiao, Xuejie HuangAbstract:Anode materials in Sodium-Ion Batteries can undergo significant volume change upon sodium insertion and extraction, leading to deteriorated cycling performance. Wang et al. report a layered metal oxide anode with zero-strain characteristics, which may lead to extended battery cycle life.
