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Supporting Information for "Electrochemical Properties of Poly(vinylidene fluoride-co-hexafluoropropylene) Gel Electrolytes with High-Concentration Li Salt/Sulfolane for Lithium Batteries"

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posted on 18.08.2021, 07:26 by Ji-young OCK, Miki FUJISHIRO, Kazuhide UENO, Masayoshi WATANABE, Kaoru DOKKO
Combining highly concentrated electrolytes with a polymer network is a valid approach to simultaneously achieve fast Li+ ion transport, high thermal stability, and a wide electrochemical window in a quasi-solid-state form. In this work, flexible gel electrolytes comprising commercially available poly(vinylidene fluoride-co-hexafluoropropylene) (PVDF–HFP) and highly concentrated electrolytes of Li salts/sulfolane (SL) were prepared by a simple solution casting method. The anionic effects of the gel electrolytes on the Li-ion conductivity and charge transfer kinetics at the gel/electrode interface were investigated. The SL-based gel electrolyte with lithium bis(fluorosulfonyl)amide (LiFSA) showed an ionic conductivity of 0.7 mS cm−1 and a high Li transference number (>0.5) at 30 °C. The charge transfer resistance in a [Li/gel/LiCoO2] cell with LiFSA was lower than that of the cells with lithium bis(trifluoromethanesulfonyl)amide (LiTFSA) or LiBF4, indicating faster interfacial charge transfer kinetics in the gel electrolyte with FSA. The Li/LiCoO2 cell with the LiFSA/SL gel electrolyte exhibited a higher capacity than that of the cells with the LiTFSA/SL and LiBF4/SL gel electrolytes. Hence, rationally designed gel electrolytes containing highly concentrated SL-based electrolytes enable the high rate performance of Li batteries.

Funding

Electrolyte design for high-speed alkali metal ion hopping conduction and high speed electrochemical reaction

Japan Society for the Promotion of Science

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Interface Ionics : Fabrication of model systems and their fundamental ion dynamics

Japan Society for the Promotion of Science

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Electric double layer in nanospace: Statistical analysis of experimental data and statistical analysis of calculated data

Japan Society for the Promotion of Science

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advanced low carbon technology research and development program JPMJAL1301

History

Manuscript title

Electrochemical Properties of Poly(vinylidene fluoride-co-hexafluoropropylene) Gel Electrolytes with High-Concentration Li Salt/Sulfolane for Lithium Batteries