Abstract
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 ...
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