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Single Lithium-Ion Polymer Electrolytes Based on Poly(ionic liquid)s for Lithium-Ion Batteries

Abstract

A promising method of synthesizing lithium-containing room temperature polymeric ionic liquid (PIL) by utilizing zwitterionic effect to turn a lithium salt into a liquid for single lithium-ion conduction was proposed. In this work, the room temperature PIL was constructed by the equimolar monomer mixture of zwitterion 3-(1-vinyl-3-imidazolic) propanesulfonate (VIPS) and 4-styrenesulfnny (trifluoromethylsulfony)imde (LiSTFSI) based on the intermolecular electrostatic interaction. In-situ photopolymerization with flexible chain poly (ethylene glycol) methyl ether methacrylate (PEGM) and cross-linker poly (ethylene glycol) dimethacrylate (PEGDM) in the presence of propylene carbonate (PC) generated free-standing PIL electrolyte films. The PIL electrolytes with Li+-rich channels have excellent lithium transference number approaching unity (0.93 at room temperature) while attaining comparable ionic conductivity (σ≈1.31ꓫ10-4 S cm-1 at 30°C). The charge-discharge performance of Li/LiFePO4 half-cell equipped with this PIL electrolyte would provide a promising model system for novel single lithium ion conductors.

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Publication details

The article was received on 03 May 2018, accepted on 07 Jul 2018 and first published on 10 Jul 2018


Article type: Paper
DOI: 10.1039/C8SM00907D
Citation: Soft Matter, 2018, Accepted Manuscript
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    Single Lithium-Ion Polymer Electrolytes Based on Poly(ionic liquid)s for Lithium-Ion Batteries

    Y. Yu, F. Lu, N. Sun, A. Wu, W. Pan and L. Zheng, Soft Matter, 2018, Accepted Manuscript , DOI: 10.1039/C8SM00907D

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