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Tuning Thin-Film Electrolyte for Lithium Battery by Grafting Cyclic Carbonate and Combed Poly(ethylene oxide) on Polysiloxane

Authors

  • Dr. Jie Li,

    1. School of Metallurgy and Environment, Central South University, 932 Lushan South Road, Changsha City, 410083 (PR China)
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  • Yue Lin,

    1. School of Metallurgy and Environment, Central South University, 932 Lushan South Road, Changsha City, 410083 (PR China)
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  • Hehua Yao,

    1. School of Metallurgy and Environment, Central South University, 932 Lushan South Road, Changsha City, 410083 (PR China)
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  • Dr. Changfu Yuan,

    1. School of Metallurgy and Environment, Central South University, 932 Lushan South Road, Changsha City, 410083 (PR China)
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  • Prof. Jin Liu

    Corresponding author
    1. School of Metallurgy and Environment, Central South University, 932 Lushan South Road, Changsha City, 410083 (PR China)
    • School of Metallurgy and Environment, Central South University, 932 Lushan South Road, Changsha City, 410083 (PR China)===

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Abstract

A tunable polysiloxane thin-film electrolyte for all-solid-state lithium-ion batteries was developed. The polysiloxane was synthesized by hydrosilylation of polymethylhydrosiloxane with cyclic [(allyloxy)methyl]ethylene ester carbonic acid and vinyl tris(2-methoxyethoxy)silane. 1H NMR spectroscopy and gel-permeation chromatography demonstrated that the bifunctional groups of the cyclic propylene carbonate (PC) and combed poly(ethylene oxide) (PEO) were well grafted on the polysiloxane. At PC/PEO=6:4, the polysiloxane-based electrolyte had an ionic conductivity of 1.55×10−4 and 1.50×10−3 S cm−1 at 25 and 100 °C, respectively. The LiFePO4/Li batteries fabricated with the thin-film electrolyte presented excellent cycling performance in the temperature range from 25 to 100 °C with an initial discharge capacity at a rate of 1 C of 88.2 and 140 mA h g−1 at 25 and 100 °C, respectively.

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