Incorporation of Poly(Ionic Liquid) with PVDF-HFP-Based Polymer Electrolyte for All-Solid-State Lithium-Ion Batteries

Polymers

Hongfei Pan¹  Ruiming Zhang²  Fangfang Zhang³  Haolin Tang⁴  Haining Zhang⁴  Zhefei Ruan⁴  Yuzhe Du⁴ 

[1] Foshan Xianhu Laboratory of the Advanced Energy Science and Technology Guangdong Laboratory, Foshan 528200, China;Guangdong Hydrogen Energy Institute of WHUT, Foshan 528000, China;School of Nuclear Technology and Chemistry & Biology, Hubei University of Science and Technology, Nr. 88 Xianning Avenue, Xianning 437100, China;State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, China;

关键词: solid polymer electrolyte;    all-solid-state;    lithium-ion battery;    ion conduction;    polymer composite;   

DOI  :  10.3390/polym14101950

来源: DOAJ

【 摘 要 】

A solid-state polymer electrolyte membrane is formed by blending poly(vinylidene fluoride-co-hexafluoropropylene) with the synthesized copolymer of poly(methyl methacrylate-co-1-vinyl-3-butyl-imidazolium bis(trifluoromethanesulfonyl)imide, in which lithium bis(trifluoromethane)sulfonimide molecules are applied as the source of lithium ions. The accordingly formed membrane that contains 14 wt.% of P(MMA-co-VBIm-TFSI), 56 wt.% of PVDF-HFP, and 30 wt.% of LiTFSI manifests the best electrochemical properties, achieving an ionic conductivity of 1.11 × 10⁻⁴ S·cm⁻¹ at 30 °C and 4.26 × 10⁻⁴ S·cm⁻¹ at 80 °C, a Li-ion transference number of 0.36, and a wide electrochemical stability window of 4.7 V (vs. Li/Li⁺). The thus-assembled all-solid-state lithium-ion battery of LiFePO₄/SPE/Li delivers a discharge specific capacity of 148 mAh·g⁻¹ in the initial charge–discharge cycle at 0.1 C under 60 °C. The capacity retention of the cell is 95.2% after 50 cycles at 0.1 C and the Coulombic efficiency remains close to 100% during the cycling process.

【 授权许可】

Unknown