Abstract
Gel polymer electrolytes are one of the candidates for solid electrolytes to solve safety issues and improve the energy density of solid-state lithium batteries. Gel polymer electrolyte has high ionic conductivity at room temperature (~ 10−3 S cm−1), but its mechanical properties are poor. Herein, we prepared a series of composite gel polymer electrolytes by N-methyl-N-propylpiperidinium bis(trifluoromethanesulfonyl)imide, poly(vinylidene fluoride-hexafluoropropylene), LiTFSI, and various inorganic fillers. The addition of 5 wt% TiO2 can not only increase the ionic conductivity of gel polymer electrolytes but also improve the mechanical properties of gel polymer electrolytes. Besides, as a semiconductor, the TiO2 has safety risk when uses in composite gel polymer electrolyte. TiO2-ILGPE safety is investigated by cyclic voltammetry and battery performance. Additionally, TiO2-ILGPE displays a perfect flame-retarding ability, and TiO2 would not be reduced by the lithium metal anode.
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Funding
The work was supported by the National Natural Science Foundation of China (Grant No. 21878061). X.P. and Q.H. acknowledge the support from China Scholarship Council.
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P.Y., X.P., and Q.H. designed the experiments. X.P. and Q.H. performed preparation, materials characterization, and electrochemical measurements. L.L, J.Z., and M.A. participated in the scientific discussion. X.P. and Q.H. analyzed the data and wrote the manuscript with assistance from coauthors.
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Pan, X., Hou, Q., Liu, L. et al. Semiconductor TiO2 ceramic filler for safety-improved composite ionic liquid gel polymer electrolytes. Ionics 27, 2045–2051 (2021). https://doi.org/10.1007/s11581-020-03850-9
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DOI: https://doi.org/10.1007/s11581-020-03850-9