Fluorinated Copolymer Functionalized with Ethylene Oxide as Novel Water-Borne Binder for a High-Power Lithium Ion Battery: Synthesis, Mechanism, and Application

Chih Hao Tsao, E. Ting Wu, Wei Hsun Lee, Chi Cheng Chiu, Ping Lin Kuo

研究成果: Article同行評審

11 引文 斯高帕斯(Scopus)

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 LiFePO4-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 LiFePO4-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
1
發行號8
DOIs
出版狀態Published - 2018 8月 27

All Science Journal Classification (ASJC) codes

  • 化學工程(雜項)
  • 能源工程與電力技術
  • 電化學
  • 電氣與電子工程
  • 材料化學

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