The Experts below are selected from a list of 10851 Experts worldwide ranked by ideXlab platform
Hui Zhao - One of the best experts on this subject based on the ideXlab platform.
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Mussel-Inspired Conductive Polymer Binder for Si-Alloy Anode in Lithium-Ion Batteries
ACS applied materials & interfaces, 2018Co-Authors: Hui Zhao, Yang Wei, Cheng Wang, Ruimin Qiao, Wanli Yang, Phillip B. Messersmith, Gao LiuAbstract:The excessive volume changes during cell cycling of Si-based anode in lithium ion batteries impeded its application. One major reason for the cell failure is particle isolation during volume shrinkage in delithiation process, which makes strong adhesion between Polymer Binder and anode active material particles a highly desirable property. Here, a biomimetic side-chain conductive Polymer incorporating catechol, a key adhesive component of the mussel holdfast protein, was synthesized. Atomic force microscopy-based single-molecule force measurements of mussel-inspired conductive Polymer Binder contacting a silica surface revealed a similar adhesion toward substrate when compared with an effective Si anode Binder, homo-poly(acrylic acid), with the added benefit of being electronically conductive. Electrochemical experiments showed a very stable cycling of Si-alloy anodes realized via this biomimetic conducting Polymer Binder, leading to a high loading Si anode with a good rate performance. We attribute the a...
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Conductive Polymer Binder-Enabled SiO-SnxCoyCz Anode for High-Energy Lithium-Ion Batteries.
ACS applied materials & interfaces, 2016Co-Authors: Hui Zhao, Xiangyun Song, Min Ling, Zhe Jia, Zonghai Chen, Khalil Amine, Gao LiuAbstract:A SiOSnCoC composite anode is assembled using a conductive Polymer Binder for the application in next-generation high energy density lithium-ion batteries. A specific capacity of 700 mAh/g is achieved at a 1C (900 mA/g) rate. A high active material loading anode with an areal capacity of 3.5 mAh/cm(2) is demonstrated by mixing SiOSnCoC with graphite. To compensate for the lithium loss in the first cycle, stabilized lithium metal powder (SLMP) is used for prelithiation; when paired with a commercial cathode, a stable full cell cycling performance with a 86% first cycle efficiency is realized. By achieving these important metrics toward a practical application, this conductive Polymer Binder/SiOSnCoC anode system presents great promise to enable the next generation of high-energy lithium-ion batteries.
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conductive Polymer Binder for high tap density nanosilicon material for lithium ion battery negative electrode application
Nano Letters, 2015Co-Authors: Hui Zhao, Ziyan Zheng, Yanbao Fu, Yang Wei, Ruimin Qiao, Min Ling, Zhe Jia, Chenhui Zhu, Ying Bai, Jinglei LeiAbstract:© 2015 American Chemical Society. High-tap-density silicon nanomaterials are highly desirable as anodes for lithium ion batteries, due to their small surface area and minimum first-cycle loss. However, this material poses formidable challenges to Polymeric Binder design. Binders adhere on to the small surface area to sustain the drastic volume changes during cycling; also the low porosities and small pore size resulting from this material are detrimental to lithium ion transport. This study introduces a new Binder, poly(1-pyrenemethyl methacrylate-co-methacrylic acid) (PPyMAA), for a high-tap-density nanosilicon electrode cycled in a stable manner with a first cycle efficiency of 82%-a value that is further improved to 87% when combined with graphite material. Incorporating the MAA acid functionalities does not change the lowest unoccupied molecular orbital (LUMO) features or lower the adhesion performance of the PPy homoPolymer. Our single-molecule force microscopy measurement of PPyMAA reveals similar adhesion strength between Polymer Binder and anode surface when compared with conventional Polymer such as homopolyacrylic acid (PAA), while being electronically conductive. The combined conductivity and adhesion afforded by the MAA and pyrene coPolymer results in good cycling performance for the high-tap-density Si electrode.
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Conductive Polymer Binder for High-Tap-Density Nanosilicon Material for Lithium-Ion Battery Negative Electrode Application
Nano Letters, 2015Co-Authors: Hui Zhao, Ziyan Zheng, Yang Wei, Ruimin Qiao, Min Ling, Zhe Jia, Chenhui Zhu, Ying Bai, Jinglei LeiAbstract:High-tap-density silicon nanomaterials are highly desirable as anodes for lithium ion batteries, due to their small surface area and minimum first-cycle loss. However, this material poses formidable challenges to Polymeric Binder design. Binders adhere on to the small surface area to sustain the drastic volume changes during cycling; also the low porosities and small pore size resulting from this material are detrimental to lithium ion transport. This study introduces a new Binder, poly(1-pyrenemethyl methacrylate-co-methacrylic acid) (PPyMAA), for a high-tap-density nanosilicon electrode cycled in a stable manner with a first cycle efficiency of 82%-a value that is further improved to 87% when combined with graphite material. Incorporating the MAA acid functionalities does not change the lowest unoccupied molecular orbital (LUMO) features or lower the adhesion performance of the PPy homoPolymer. Our single-molecule force microscopy measurement of PPyMAA reveals similar adhesion strength between Polymer Binder and anode surface when compared with conventional Polymer such as homopolyacrylic acid (PAA), while being electronically conductive. The combined conductivity and adhesion afforded by the MAA and pyrene coPolymer results in good cycling performance for the high-tap-density Si electrode.
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high capacity and high density functional conductive Polymer and sio anode for high energy lithium ion batteries
ACS Applied Materials & Interfaces, 2015Co-Authors: Hui Zhao, Ziyan Zheng, Guerfi Abdelbast, Vincent Battaglia, Neslihan Yuca, Karim Zaghib, Gao LiuAbstract:High capacity and high density functional conductive Polymer Binder/SiO electrodes are fabricated and calendered to various porosities. The effect of calendering is investigated in the reduction of thickness and porosity, as well as the increase of density. SiO particle size remains unchanged after calendering. When compressed to an appropriate density, an improved cycling performance and increased energy density are shown compared to the uncalendered electrode and overcalendered electrode. The calendered electrode has a high-density of ∼1.2 g/cm3. A high loading electrode with an areal capacity of ∼3.5 mAh/cm2 at a C/10 rate is achieved using functional conductive Polymer Binder and simple and effective calendering method.
Gao Liu - One of the best experts on this subject based on the ideXlab platform.
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Mussel-Inspired Conductive Polymer Binder for Si-Alloy Anode in Lithium-Ion Batteries
ACS applied materials & interfaces, 2018Co-Authors: Hui Zhao, Yang Wei, Cheng Wang, Ruimin Qiao, Wanli Yang, Phillip B. Messersmith, Gao LiuAbstract:The excessive volume changes during cell cycling of Si-based anode in lithium ion batteries impeded its application. One major reason for the cell failure is particle isolation during volume shrinkage in delithiation process, which makes strong adhesion between Polymer Binder and anode active material particles a highly desirable property. Here, a biomimetic side-chain conductive Polymer incorporating catechol, a key adhesive component of the mussel holdfast protein, was synthesized. Atomic force microscopy-based single-molecule force measurements of mussel-inspired conductive Polymer Binder contacting a silica surface revealed a similar adhesion toward substrate when compared with an effective Si anode Binder, homo-poly(acrylic acid), with the added benefit of being electronically conductive. Electrochemical experiments showed a very stable cycling of Si-alloy anodes realized via this biomimetic conducting Polymer Binder, leading to a high loading Si anode with a good rate performance. We attribute the a...
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Conductive Polymer Binder-Enabled SiO-SnxCoyCz Anode for High-Energy Lithium-Ion Batteries.
ACS applied materials & interfaces, 2016Co-Authors: Hui Zhao, Xiangyun Song, Min Ling, Zhe Jia, Zonghai Chen, Khalil Amine, Gao LiuAbstract:A SiOSnCoC composite anode is assembled using a conductive Polymer Binder for the application in next-generation high energy density lithium-ion batteries. A specific capacity of 700 mAh/g is achieved at a 1C (900 mA/g) rate. A high active material loading anode with an areal capacity of 3.5 mAh/cm(2) is demonstrated by mixing SiOSnCoC with graphite. To compensate for the lithium loss in the first cycle, stabilized lithium metal powder (SLMP) is used for prelithiation; when paired with a commercial cathode, a stable full cell cycling performance with a 86% first cycle efficiency is realized. By achieving these important metrics toward a practical application, this conductive Polymer Binder/SiOSnCoC anode system presents great promise to enable the next generation of high-energy lithium-ion batteries.
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electronically conductive Polymer Binder for lithium ion battery electrode
2015Co-Authors: Gao Liu, Shidi Xun, Vincent S Battaglia, Honghe ZhengAbstract:A family of carboxylic acid group containing fluorene/fluorenon coPolymers is disclosed as Binders of silicon particles in the fabrication of negative electrodes for use with lithium ion batteries. These Binders enable the use of silicon as an electrode material as they significantly improve the cycle-ability of silicon by preventing electrode degradation over time. In particular, these Polymers, which become conductive on first charge, bind to the silicon particles of the electrode, are flexible so as to better accommodate the expansion and contraction of the electrode during charge/discharge, and being conductive promote the flow battery current.
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high capacity and high density functional conductive Polymer and sio anode for high energy lithium ion batteries
ACS Applied Materials & Interfaces, 2015Co-Authors: Hui Zhao, Ziyan Zheng, Guerfi Abdelbast, Vincent Battaglia, Neslihan Yuca, Karim Zaghib, Gao LiuAbstract:High capacity and high density functional conductive Polymer Binder/SiO electrodes are fabricated and calendered to various porosities. The effect of calendering is investigated in the reduction of thickness and porosity, as well as the increase of density. SiO particle size remains unchanged after calendering. When compressed to an appropriate density, an improved cycling performance and increased energy density are shown compared to the uncalendered electrode and overcalendered electrode. The calendered electrode has a high-density of ∼1.2 g/cm3. A high loading electrode with an areal capacity of ∼3.5 mAh/cm2 at a C/10 rate is achieved using functional conductive Polymer Binder and simple and effective calendering method.
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Manipulating the polarity of conductive Polymer Binders for Si-based anodes in lithium-ion batteries
Journal of Materials Chemistry A, 2015Co-Authors: Xiangyun Song, Wanli Yang, Vincent Battaglia, Xiaosong Liu, Gao LiuAbstract:Si-based anodes continue to draw tremendous interest for lithium-ion batteries due to their large specific capacity for lithium. However, maintaining the stability while extracting high capacity from Si anodes remains a challenge because of significant volume changes during their electrochemical alloying and de-alloying with lithium. Polymer Binder selection and optimization may allow dramatic improvements in the performance of Si-based anodes. Most studies of Polymer Binders of Si anodes have involved the use of insulating poly(vinylidene fluoride) (PVDF) and carboxyl group containing carboxymethylcellulose (CMC) or poly(acrylic acid) (PAA). Herein, we report for the first time the systematic studies on manipulating the polarity by adjusting the molar ratio of polar triethyleneoxide side chains, therefore the electrolyte up-taking properties change systematically for conductive polyfluorene-based Polymer Binders. The results show that through optimizing the polarity of Polymer Binders, superior performance as a Binder for Si anodes may be obtained. This study could be used as a model system and may open new avenues to explore a novel series of Binders for both insulating and conductive Polymer Binder families.
Tae Hyun Kim - One of the best experts on this subject based on the ideXlab platform.
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A conductive self healing Polymeric Binder using hydrogen bonding for Si anodes in lithium ion batteries
Scientific reports, 2020Co-Authors: Jaebin Nam, K K Rajeev, Eunsoo Kim, Yeonho Kim, Tae Hyun KimAbstract:A ureido-pyrimidinone (UPy)-functionalized poly(acrylic acid) grafted with poly(ethylene glycol)(PEG), designated PAU-g-PEG, was developed as a high performance Polymer Binder for Si anodes in lithium-ion batteries. By introducing both a ureido-pyrimidinone (UPy) unit, which is capable of self-healing through dynamic hydrogen bonding within molecules as well as with Si, and an ion-conducting PEG onto the side chain of the poly(acrylic acid), this water-based self-healable and conductive Polymer Binder can effectively accommodate the volume changes of Si, while maintaining electronic integrity, in an electrode during repeated charge/discharge cycles. The Si@PAU-g-PEG electrode retained a high capacity of 1,450.2 mAh g-1 and a Coulombic efficiency of 99.4% even after 350 cycles under a C-rate of 0.5 C. Under a high C-rate of 3 C, an outstanding capacity of 2,500 mAh g-1 was also achieved, thus demonstrating its potential for improving the electrochemical performance of Si anodes.
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A self-healable Polymer Binder for Si anodes based on reversible Diels–Alder chemistry
Electrochimica Acta, 2020Co-Authors: K K Rajeev, Jaebin Nam, Eunsoo Kim, Yeonho Kim, Tae Hyun KimAbstract:Abstract Polymeric Binders that interact strongly with Si can overcome a rapid capacity fading caused by its large volumetric changes (around 400%) during the charge-discharge process when Si was used as a next generation anode material in lithium ion batteries (LIBs). Among them, poly(acrylic acid) (PAA) is known to improve cell cyclability by enhancing the mechanical properties of Si through hydrogen bonding. This study added 1,6-bismaleimide (BMI) as a crosslinker to furfurylamine-functionalized poly(acrylic acid) (FPAA) and formed a 3D crosslinked Polymer network based on thermal Diels–Alder (D–A) click chemistry, which was then used as a new Polymer Binder for the Si anode. Having the reversible nature of D–A chemistry, the crosslinked network exhibited a self-healing property. The Si electrode with the D-A-adduct Binder (DA-PAA) had excellent adhesive strength with regards to Si. After 200 cycles, it recorded a reversible capacity of 1076 mAh g−1 and a high Coulombic efficiency of 99.7%, both of which were much higher than the values obtained for typical commercial Binders.
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physically cross linked Polymer Binder based on poly acrylic acid and ion conducting poly ethylene glycol co benzimidazole for silicon anodes
Journal of Power Sources, 2017Co-Authors: Sanghyun Lim, Kukjoo Lee, Taeeun Yim, Junyoung Mun, Inseop Shin, Artur Tron, Tae Hyun KimAbstract:Abstract The practical applications of Si electrodes in lithium-ion batteries are limited since they undergo large changes in volume during charge and discharge, and consequently become highly deteriorated. A novel Binder system holding silicon particles together and preventing disintegration of the electrode during operation hence needs to be developed to enable reliable cycleability. In the current work, such a new Polymer Binder system, based on poly(acrylic acid) (PAA) and poly(ethylene glycol-co-benzimidazole) (PEGPBI), is developed for silicon anodes. The physical crosslinking using acid-base interactions between PAA and PBI, together with the ion-conducting PEG group, yields physical properties for the resulting PAA-PEGPBI-based anodes that are better than those of electrodes based on the currently available PAA Binder, and yields good cell performances. A Si-based electrode with high loading levels of 1.0–1.3 mg cm−2 (0.7–0.91 Si mg cm−2) is reliably manufactured using specifically PAA-PEGPBI-2, which is made with 2 wt% of PEGPBI relative to PAA, and shows a very high capacity value of 1221 mAh g−1 at a rate of 0.5 C after 50 cycles, and a high capacity value of more than 1600 mAh g−1 at a high rate of 2 C.
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physically cross linked Polymer Binder induced by reversible acid base interaction for high performance silicon composite anodes
ACS Applied Materials & Interfaces, 2015Co-Authors: Sanghyun Lim, Hodong Chu, Kukjoo Lee, Taeeun Yim, Youngjun Kim, Junyoung Mun, Tae Hyun KimAbstract:Silicon is greatly promising for high-capacity anode materials in lithium-ion batteries (LIBs) due to their exceptionally high theoretical capacity. However, it has a big challenge of severe volume changes during charge and discharge, resulting in substantial deterioration of the electrode and restricting its practical application. This conflict requires a novel Binder system enabling reliable cyclability to hold silicon particles without severe disintegration of the electrode. Here, a physically cross-linked Polymer Binder induced by reversible acid–base interaction is reported for high performance silicon-anodes. Chemical cross-linking of Polymer Binders, mainly based on acidic Polymers including poly(acrylic acid) (PAA), have been suggested as effective ways to accommodate the volume expansion of Si-based electrodes. Unlike the common chemical cross-linking, which causes a gradual and nonreversible fracturing of the cross-linked network, a physically cross-linked Binder based on PAA–PBI (poly(benzimida...
Jinglei Lei - One of the best experts on this subject based on the ideXlab platform.
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conductive Polymer Binder for high tap density nanosilicon material for lithium ion battery negative electrode application
Nano Letters, 2015Co-Authors: Hui Zhao, Ziyan Zheng, Yanbao Fu, Yang Wei, Ruimin Qiao, Min Ling, Zhe Jia, Chenhui Zhu, Ying Bai, Jinglei LeiAbstract:© 2015 American Chemical Society. High-tap-density silicon nanomaterials are highly desirable as anodes for lithium ion batteries, due to their small surface area and minimum first-cycle loss. However, this material poses formidable challenges to Polymeric Binder design. Binders adhere on to the small surface area to sustain the drastic volume changes during cycling; also the low porosities and small pore size resulting from this material are detrimental to lithium ion transport. This study introduces a new Binder, poly(1-pyrenemethyl methacrylate-co-methacrylic acid) (PPyMAA), for a high-tap-density nanosilicon electrode cycled in a stable manner with a first cycle efficiency of 82%-a value that is further improved to 87% when combined with graphite material. Incorporating the MAA acid functionalities does not change the lowest unoccupied molecular orbital (LUMO) features or lower the adhesion performance of the PPy homoPolymer. Our single-molecule force microscopy measurement of PPyMAA reveals similar adhesion strength between Polymer Binder and anode surface when compared with conventional Polymer such as homopolyacrylic acid (PAA), while being electronically conductive. The combined conductivity and adhesion afforded by the MAA and pyrene coPolymer results in good cycling performance for the high-tap-density Si electrode.
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Conductive Polymer Binder for High-Tap-Density Nanosilicon Material for Lithium-Ion Battery Negative Electrode Application
Nano Letters, 2015Co-Authors: Hui Zhao, Ziyan Zheng, Yang Wei, Ruimin Qiao, Min Ling, Zhe Jia, Chenhui Zhu, Ying Bai, Jinglei LeiAbstract:High-tap-density silicon nanomaterials are highly desirable as anodes for lithium ion batteries, due to their small surface area and minimum first-cycle loss. However, this material poses formidable challenges to Polymeric Binder design. Binders adhere on to the small surface area to sustain the drastic volume changes during cycling; also the low porosities and small pore size resulting from this material are detrimental to lithium ion transport. This study introduces a new Binder, poly(1-pyrenemethyl methacrylate-co-methacrylic acid) (PPyMAA), for a high-tap-density nanosilicon electrode cycled in a stable manner with a first cycle efficiency of 82%-a value that is further improved to 87% when combined with graphite material. Incorporating the MAA acid functionalities does not change the lowest unoccupied molecular orbital (LUMO) features or lower the adhesion performance of the PPy homoPolymer. Our single-molecule force microscopy measurement of PPyMAA reveals similar adhesion strength between Polymer Binder and anode surface when compared with conventional Polymer such as homopolyacrylic acid (PAA), while being electronically conductive. The combined conductivity and adhesion afforded by the MAA and pyrene coPolymer results in good cycling performance for the high-tap-density Si electrode.
Daegeun Choi - One of the best experts on this subject based on the ideXlab platform.
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gold coated silicon nanowire graphene core shell composite film as a Polymer Binder free anode for rechargeable lithium ion batteries
Physica E-low-dimensional Systems & Nanostructures, 2014Co-Authors: Hanjung Kim, Sang Eon Lee, Jihye Lee, Jooyun Jung, Eungsug Lee, Junhyuk Choi, Junho Jung, Seungmin Hyun, Daegeun ChoiAbstract:Abstract We designed and fabricated a gold (Au)-coated silicon nanowires/graphene (Au–SiNWs/G) hybrid composite as a Polymer Binder-free anode for rechargeable lithium-ion batteries (LIBs). A large amount of SiNWs for LIB anode materials can be prepared by metal-assisted chemical etching (MaCE) process. The Au–SiNWs/G composite film on current collector was obtained by vacuum filtration using an anodic aluminum oxide (AAO) membrane and hot pressing method. Our experimental results show that the Au–SiNWs/G composite has a stable reversible capacity of about 1520 mA h/g which was maintained for 20 cycles. The Au–SiNWs/G composite anode showed much better cycling performance than SiNWs/polyvinylidene fluoride (PVDF)/Super-P, SiNWs/G composite, and pure SiNWs anodes. The improved electrochemical properties of the Au–SiNWs/G composite anode material is mainly ascribed to the composite׳s porous network structure.
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Highly robust silicon nanowire/graphene core-shell electrodes without Polymeric Binders.
Nanoscale, 2013Co-Authors: Sang Eon Lee, Hanjung Kim, Hwanjin Kim, Jong Hyeok Park, Daegeun ChoiAbstract:A large theoretical charge storage capacity along with a low discharge working potential renders silicon a promising anode material for high energy density lithium ion batteries. However, up to 400% volume expansion during charge–discharge cycling coupled with a low intrinsic electronic conductivity causes pulverization and fracture, thus inhibiting silicon's widespread use in practical applications. We report herein on a low cost approach to fabricate hybrid silicon nanowire (SiNW)/graphene nanostructures that exhibit enhanced cycle performance with the capability of retaining more than 90% of their initial capacity after 50 cycles. We also demonstrate the use of hot-pressing in the absence of any common Polymer Binder such as PVDF to bind the hybrid structure to the current collector. The applied heat and pressure ensure strong adhesion between the SiNW/graphene nano-composite and current collector. This facile yet strong binding method is expected to find use in the further development of Polymer-Binder free anodes for lithium ion batteries.