摘要
A novel water-borne fluorinated binder is synthesized via copolymerizing 2-(perfluorohexyl) ethyl methacrylate (PFHEMA) and poly(ethylene glycol) methacrylate (PEGMA) to improve the performance of lithium ion battery with LiFePO 4 -based cathode materials. The resulting copolymer binders can self-assemble into 150-220 nm particles stably dispersed in aqueous solution. Self-dispersed fluorinated binders (SF binders) with the PFHEMA to PEGMA ratio of 3:1 effectively reduce the overpotential during the high-discharge current density compared with the conventional PVDF cathode binder. Further increasing the PEGMA amount yet decreases the electrochemical performance of SF binders, inconsistent with the expected Li + conduction of the PEO moiety. Molecular dynamics simulations show that the PEO segments reduce the Li + and PF6 - interaction and increase the amount of unpaired Li + . In contrast, the PEO moiety wrapping around Li + can decrease its mobility. These competing effects lead to the observed optimum ratio of PEO to fluorinated moieties. The novel SF binders are fully compatible with LiFePO 4 -based cathode materials and feature small impedance after charging and discharging. Coin cells assembled with the SF cathode binder demonstrated excellent cyclic performance after 150 cycles with negligible decay and near-100% column efficiency. The superior performance of the novel water-borne SF binders makes them excellent candidates for the environmentally friendly production of high-power lithium ion batteries.
| 原文 | English |
|---|---|
| 頁（從 - 到） | 3999-4008 |
| 頁數 | 10 |
| 期刊 | ACS Applied Energy Materials |
| 卷 | 1 |
| 發行號 | 8 |
| DOIs | |
| 出版狀態 | Published - 2018 八月 27 |
指紋
All Science Journal Classification (ASJC) codes
- Chemical Engineering (miscellaneous)
- Energy Engineering and Power Technology
- Electrochemistry
- Materials Chemistry
- Electrical and Electronic Engineering
引用此文
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Fluorinated Copolymer Functionalized with Ethylene Oxide as Novel Water-Borne Binder for a High-Power Lithium Ion Battery : Synthesis, Mechanism, and Application. / Tsao, Chih Hao; Wu, E. Ting; Lee, Wei Hsun; Chiu, Chi Cheng; Kuo, Ping Lin.
於: ACS Applied Energy Materials, 卷 1, 編號 8, 27.08.2018, p. 3999-4008.研究成果: Article
TY - JOUR
T1 - Fluorinated Copolymer Functionalized with Ethylene Oxide as Novel Water-Borne Binder for a High-Power Lithium Ion Battery
T2 - Synthesis, Mechanism, and Application
AU - Tsao, Chih Hao
AU - Wu, E. Ting
AU - Lee, Wei Hsun
AU - Chiu, Chi Cheng
AU - Kuo, Ping Lin
PY - 2018/8/27
Y1 - 2018/8/27
N2 - A novel water-borne fluorinated binder is synthesized via copolymerizing 2-(perfluorohexyl) ethyl methacrylate (PFHEMA) and poly(ethylene glycol) methacrylate (PEGMA) to improve the performance of lithium ion battery with LiFePO 4 -based cathode materials. The resulting copolymer binders can self-assemble into 150-220 nm particles stably dispersed in aqueous solution. Self-dispersed fluorinated binders (SF binders) with the PFHEMA to PEGMA ratio of 3:1 effectively reduce the overpotential during the high-discharge current density compared with the conventional PVDF cathode binder. Further increasing the PEGMA amount yet decreases the electrochemical performance of SF binders, inconsistent with the expected Li + conduction of the PEO moiety. Molecular dynamics simulations show that the PEO segments reduce the Li + and PF6 - interaction and increase the amount of unpaired Li + . In contrast, the PEO moiety wrapping around Li + can decrease its mobility. These competing effects lead to the observed optimum ratio of PEO to fluorinated moieties. The novel SF binders are fully compatible with LiFePO 4 -based cathode materials and feature small impedance after charging and discharging. Coin cells assembled with the SF cathode binder demonstrated excellent cyclic performance after 150 cycles with negligible decay and near-100% column efficiency. The superior performance of the novel water-borne SF binders makes them excellent candidates for the environmentally friendly production of high-power lithium ion batteries.
AB - A novel water-borne fluorinated binder is synthesized via copolymerizing 2-(perfluorohexyl) ethyl methacrylate (PFHEMA) and poly(ethylene glycol) methacrylate (PEGMA) to improve the performance of lithium ion battery with LiFePO 4 -based cathode materials. The resulting copolymer binders can self-assemble into 150-220 nm particles stably dispersed in aqueous solution. Self-dispersed fluorinated binders (SF binders) with the PFHEMA to PEGMA ratio of 3:1 effectively reduce the overpotential during the high-discharge current density compared with the conventional PVDF cathode binder. Further increasing the PEGMA amount yet decreases the electrochemical performance of SF binders, inconsistent with the expected Li + conduction of the PEO moiety. Molecular dynamics simulations show that the PEO segments reduce the Li + and PF6 - interaction and increase the amount of unpaired Li + . In contrast, the PEO moiety wrapping around Li + can decrease its mobility. These competing effects lead to the observed optimum ratio of PEO to fluorinated moieties. The novel SF binders are fully compatible with LiFePO 4 -based cathode materials and feature small impedance after charging and discharging. Coin cells assembled with the SF cathode binder demonstrated excellent cyclic performance after 150 cycles with negligible decay and near-100% column efficiency. The superior performance of the novel water-borne SF binders makes them excellent candidates for the environmentally friendly production of high-power lithium ion batteries.
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U2 - 10.1021/acsaem.8b00335
DO - 10.1021/acsaem.8b00335
M3 - Article
AN - SCOPUS:85064728894
VL - 1
SP - 3999
EP - 4008
JO - ACS Applied Energy Materials
JF - ACS Applied Energy Materials
SN - 2574-0962
IS - 8
ER -