The Experts below are selected from a list of 7863 Experts worldwide ranked by ideXlab platform
Hua-kun Liu - One of the best experts on this subject based on the ideXlab platform.
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optimizing synthesis of silicon Disordered Carbon composites for use as anode materials in lithium ion batteries
Journal of Power Sources, 2006Co-Authors: Zaiping Guo, Dianzeng Jia, Ling Yuan, Hua-kun LiuAbstract:Abstract Pyrolysis conditions for the production of silicon/Disordered Carbon (Si–DC) nanocomposites using PVA as the Carbon source were optimized in this work. It was found that the optimum sintering temperature for the Si–DC nanocomposites is 800 °C. In order to achieve good cell performance, a high argon gas flow rate and a slow heating rate are preferred in sample preparation. The morphology of the Carbon source (PVA) affects the electrochemical performance of the Si–DC nanocomposites as well. The key point to obtain Si–DC nanocomposites with good electrochemical performance is to reduce the chances of pyrolysis gases (especially CO 2 ) to react with Carbon, thereby preventing Carbon burnoff during the sintering process.
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Optimizing synthesis of silicon/Disordered Carbon composites for use as anode materials in lithium-ion batteries
Journal of Power Sources, 2006Co-Authors: Zaiping Guo, Dianzeng Jia, Ling Yuan, Hua-kun LiuAbstract:Abstract Pyrolysis conditions for the production of silicon/Disordered Carbon (Si–DC) nanocomposites using PVA as the Carbon source were optimized in this work. It was found that the optimum sintering temperature for the Si–DC nanocomposites is 800 °C. In order to achieve good cell performance, a high argon gas flow rate and a slow heating rate are preferred in sample preparation. The morphology of the Carbon source (PVA) affects the electrochemical performance of the Si–DC nanocomposites as well. The key point to obtain Si–DC nanocomposites with good electrochemical performance is to reduce the chances of pyrolysis gases (especially CO 2 ) to react with Carbon, thereby preventing Carbon burnoff during the sintering process.
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silicon Disordered Carbon nanocomposites for lithium ion battery anodes
Journal of The Electrochemical Society, 2005Co-Authors: Zaiping Guo, E. Milin, Jiazhao Wang, Jun Chen, Hua-kun LiuAbstract:Silicon/Disordered Carbon (Si-DC) nanocomposites have been synthesized by high-energy ballmilling of Si-sucrose and silicon-polyvinyl alcohol followed by pyrolysis under argon flow. The exact Disordered Carbon content in the as-prepared Si-DC nanocomposites was determined by thermogravimetric analysis for the first time. Based on the thermogravimetric analysis, X-ray diffraction, Raman, and cyclic voltammetric results, we believe that Carbon distribution on the Si particles in Si-DC nanocomposite using PVA as the Carbon source is more uniform and has higher efficiency than that using sucrose as the Carbon source, under the same preparation conditions. The Carbon content and the starting polymers significantly affect the electrochemical performance of the Si-DC nanocomposites. The optimized Si-DC nanocomposite anode demonstrated a reversible capacity of 754 mAh/g within 20 cycles.
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Silicon/Disordered Carbon Nanocomposites for Lithium-Ion Battery Anodes
Journal of The Electrochemical Society, 2005Co-Authors: Zaiping Guo, E. Milin, Jiazhao Wang, Jun Chen, Hua-kun LiuAbstract:Silicon/Disordered Carbon (Si-DC) nanocomposites have been synthesized by high-energy ballmilling of Si-sucrose and silicon-polyvinyl alcohol followed by pyrolysis under argon flow. The exact Disordered Carbon content in the as-prepared Si-DC nanocomposites was determined by thermogravimetric analysis for the first time. Based on the thermogravimetric analysis, X-ray diffraction, Raman, and cyclic voltammetric results, we believe that Carbon distribution on the Si particles in Si-DC nanocomposite using PVA as the Carbon source is more uniform and has higher efficiency than that using sucrose as the Carbon source, under the same preparation conditions. The Carbon content and the starting polymers significantly affect the electrochemical performance of the Si-DC nanocomposites. The optimized Si-DC nanocomposite anode demonstrated a reversible capacity of 754 mAh/g within 20 cycles.
Zaiping Guo - One of the best experts on this subject based on the ideXlab platform.
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optimizing synthesis of silicon Disordered Carbon composites for use as anode materials in lithium ion batteries
Journal of Power Sources, 2006Co-Authors: Zaiping Guo, Dianzeng Jia, Ling Yuan, Hua-kun LiuAbstract:Abstract Pyrolysis conditions for the production of silicon/Disordered Carbon (Si–DC) nanocomposites using PVA as the Carbon source were optimized in this work. It was found that the optimum sintering temperature for the Si–DC nanocomposites is 800 °C. In order to achieve good cell performance, a high argon gas flow rate and a slow heating rate are preferred in sample preparation. The morphology of the Carbon source (PVA) affects the electrochemical performance of the Si–DC nanocomposites as well. The key point to obtain Si–DC nanocomposites with good electrochemical performance is to reduce the chances of pyrolysis gases (especially CO 2 ) to react with Carbon, thereby preventing Carbon burnoff during the sintering process.
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Optimizing synthesis of silicon/Disordered Carbon composites for use as anode materials in lithium-ion batteries
Journal of Power Sources, 2006Co-Authors: Zaiping Guo, Dianzeng Jia, Ling Yuan, Hua-kun LiuAbstract:Abstract Pyrolysis conditions for the production of silicon/Disordered Carbon (Si–DC) nanocomposites using PVA as the Carbon source were optimized in this work. It was found that the optimum sintering temperature for the Si–DC nanocomposites is 800 °C. In order to achieve good cell performance, a high argon gas flow rate and a slow heating rate are preferred in sample preparation. The morphology of the Carbon source (PVA) affects the electrochemical performance of the Si–DC nanocomposites as well. The key point to obtain Si–DC nanocomposites with good electrochemical performance is to reduce the chances of pyrolysis gases (especially CO 2 ) to react with Carbon, thereby preventing Carbon burnoff during the sintering process.
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silicon Disordered Carbon nanocomposites for lithium ion battery anodes
Journal of The Electrochemical Society, 2005Co-Authors: Zaiping Guo, E. Milin, Jiazhao Wang, Jun Chen, Hua-kun LiuAbstract:Silicon/Disordered Carbon (Si-DC) nanocomposites have been synthesized by high-energy ballmilling of Si-sucrose and silicon-polyvinyl alcohol followed by pyrolysis under argon flow. The exact Disordered Carbon content in the as-prepared Si-DC nanocomposites was determined by thermogravimetric analysis for the first time. Based on the thermogravimetric analysis, X-ray diffraction, Raman, and cyclic voltammetric results, we believe that Carbon distribution on the Si particles in Si-DC nanocomposite using PVA as the Carbon source is more uniform and has higher efficiency than that using sucrose as the Carbon source, under the same preparation conditions. The Carbon content and the starting polymers significantly affect the electrochemical performance of the Si-DC nanocomposites. The optimized Si-DC nanocomposite anode demonstrated a reversible capacity of 754 mAh/g within 20 cycles.
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Silicon/Disordered Carbon Nanocomposites for Lithium-Ion Battery Anodes
Journal of The Electrochemical Society, 2005Co-Authors: Zaiping Guo, E. Milin, Jiazhao Wang, Jun Chen, Hua-kun LiuAbstract:Silicon/Disordered Carbon (Si-DC) nanocomposites have been synthesized by high-energy ballmilling of Si-sucrose and silicon-polyvinyl alcohol followed by pyrolysis under argon flow. The exact Disordered Carbon content in the as-prepared Si-DC nanocomposites was determined by thermogravimetric analysis for the first time. Based on the thermogravimetric analysis, X-ray diffraction, Raman, and cyclic voltammetric results, we believe that Carbon distribution on the Si particles in Si-DC nanocomposite using PVA as the Carbon source is more uniform and has higher efficiency than that using sucrose as the Carbon source, under the same preparation conditions. The Carbon content and the starting polymers significantly affect the electrochemical performance of the Si-DC nanocomposites. The optimized Si-DC nanocomposite anode demonstrated a reversible capacity of 754 mAh/g within 20 cycles.
Chunsheng Wang - One of the best experts on this subject based on the ideXlab platform.
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Sulfur-impregnated Disordered Carbon nanotubes cathode for lithium-sulfur batteries
Nano Letters, 2011Co-Authors: Juchen Guo, Yunhua Xu, Chunsheng WangAbstract:The commercialization of lithium-sulfur batteries is hindered by low cycle stability and low efficiency, which are induced by sulfur active material loss and polysulfide shuttle reaction through dissolution into electrolyte. In this study, sulfur-impregnated Disordered Carbon nanotubes are synthesized as cathode material for the lithium-sulfur battery. The obtained sulfur-Carbon tube cathodes demonstrate superior cyclability and Coulombic efficiency. More importantly, the electrochemical characterization indicates a new stabilization mechanism of sulfur in Carbon induced by heat treatment.
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Electrochemical performance of lithium ion battery, nano-silicon-based, Disordered Carbon composite anodes with different microstructures
Journal of Power Sources, 2004Co-Authors: Xiangwu Zhang, Chunsheng Wang, Prashanth K. Patil, A. John Appleby, Frank E. Little, David L. CockeAbstract:Abstract Nano-silicon-based Disordered Carbon composites prepared by mechanical milling and pyrolysis have been examined as anodes of a lithium ion cell. Electrochemical measurements show that the charge–discharge capacity of Disordered Carbon composites incorporating both silicon-polyparaphenylene (Si-PPP) and silicon-polyvinyl chloride (Si-PVC) with differing silicon contents, decreases with increasing pyrolysis temperature. Si-PVC-based materials have a better cycle life than those based on Si-PPP at the same silicon content.
Kai Jiang - One of the best experts on this subject based on the ideXlab platform.
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a high performance sulfur doped Disordered Carbon anode for sodium ion batteries
Energy and Environmental Science, 2015Co-Authors: Min Zhou, Kangli Wang, Shijie Cheng, Kai JiangAbstract:Sulfur-doped Disordered Carbon is facilely synthesized and investigated as an anode for sodium ion batteries. Benefiting from the high sulfur doping (∼26.9 wt%), it demonstrates a high reversible capacity of 516 mA h g−1, excellent rate capability as well as superior cycling stability (271 mA h g−1 at 1 A g−1 after 1000 cycles).
Juan Wang - One of the best experts on this subject based on the ideXlab platform.
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enhanced cycling performance of silicon Disordered Carbon Carbon nanotubes composite for lithium ion batteries
Journal of Alloys and Compounds, 2010Co-Authors: Zhibin Zhou, Mirabbos Hojamberdiev, Wengang Liu, Juan WangAbstract:A composite anode material of silicon/Disordered Carbon/Carbon nanotubes (Si/DC/CNTs) was prepared by pyrolyzing the mixture of silicon (Si), Carbon nanotubes (CNTs), and polyvinyl chloride (PVC) as Carbon source. The X-ray diffraction (XRD) analysis confirmed that the phase transition of Si from crystalline to amorphous form occurred during the first cycle. The field-emission scanning electron microscopy (FESEM) observation revealed that Si particles wrapped by a CNTs network were homogeneously embedded into the Carbonaceous matrix. The Si/DC/CNTs composite showed a discharge capacity of 1254 mAh/g in the first cycle, and a discharge capacity of 821 mAh/g after 20 cycles, which is much higher than that of Si/DC composite (658 mAh/g). It was found that the excellent resiliency of the CNTs can assist the Carbonaceous matrix derived from PVC to restore the volumetric changes of the Si.
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Enhanced cycling performance of silicon/Disordered Carbon/Carbon nanotubes composite for lithium ion batteries
Journal of Alloys and Compounds, 2010Co-Authors: Zhibin Zhou, Mirabbos Hojamberdiev, Wengang Liu, Juan WangAbstract:A composite anode material of silicon/Disordered Carbon/Carbon nanotubes (Si/DC/CNTs) was prepared by pyrolyzing the mixture of silicon (Si), Carbon nanotubes (CNTs), and polyvinyl chloride (PVC) as Carbon source. The X-ray diffraction (XRD) analysis confirmed that the phase transition of Si from crystalline to amorphous form occurred during the first cycle. The field-emission scanning electron microscopy (FESEM) observation revealed that Si particles wrapped by a CNTs network were homogeneously embedded into the Carbonaceous matrix. The Si/DC/CNTs composite showed a discharge capacity of 1254 mAh/g in the first cycle, and a discharge capacity of 821 mAh/g after 20 cycles, which is much higher than that of Si/DC composite (658 mAh/g). It was found that the excellent resiliency of the CNTs can assist the Carbonaceous matrix derived from PVC to restore the volumetric changes of the Si.