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20-02-2018 | Energy materials | Issue 11/2018

Journal of Materials Science 11/2018

A novel room temperature POSS ionic liquid-based solid polymer electrolyte

Journal:
Journal of Materials Science > Issue 11/2018
Authors:
Jifang Fu, Qi Lu, Dapeng Shang, Liya Chen, Yong Jiang, Yufeng Xu, Jintao Yin, Xing Dong, Wei Deng, Shuai Yuan
Important notes

Electronic supplementary material

The online version of this article (https://​doi.​org/​10.​1007/​s10853-018-2135-5) contains supplementary material, which is available to authorized users.

Abstract

Ionic liquids-based solid polymer electrolytes enhance the battery’s overall performance without drawbacks in safety compared with conventional electrolyte. In order to develop a novel solid electrolyte, we synthesized a series of novel room temperature imidazolium-based polyhedral oligomeric silsesquioxane ionic liquids (POSS-ILs) consisting of POSS-COO anions and a variety of imidazolium cations, which will be used as plasticizers of solid polymer electrolyte in this work. The thermal stabilities of POSS-ILs have been dramatically enhanced by the introduction of POSS moiety, and the initial decomposition temperatures of POSS-ILs have increased by at least 94 °C compared to their corresponded succinamic acid ionic liquids. The glass transition temperatures of POSS-ILs also have increased to − 15.9 to − 25.4 °C. Then the POSS-ILs are employed to obtain a novel solid polymer electrolyte based on blend of polyethylene oxide, poly(vinylidene fluoride-hexafluoropropylene), propylene carbonate and lithium bis(trifluoromethanesulfonyl) imide with high ionic conductivity and electrochemical windows. The ionic conductivities of POSS-ILs-based solid polymer electrolytes are up to 8.0 × 10−4 S cm−1 at 22 °C and 2.0 × 10−3 S cm−1 at 62 °C, and the electrochemical windows of POSS-ILs-based solid polymer electrolytes are stable up to 5.0 V. Moreover, the Li/LiFePO4 cell containing POSS-ILs-based solid polymer electrolytes exhibits good cycling performance and high rate stability. These results suggest that the POSS-ILs-based solid polymer electrolytes could be a suitable prospective electrolyte material for lithium-ion battery applications.

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