A study on PVDF-HFP gel polymer electrolyte for lithium-ion batteries

2017 Global Conference on Polymer and Composite Materials

材料科学;化学

Liu, W.^1 ; Zhang, X.K.^1 ; Wu, F.^1 ; Xiang, Y.^1

School of Energy Science and Engineering, University of Electronic Science and Technology of China, West High-Tech Zone, No. 2006 Xiyuan Avenue, Chengdu, Sichuan, China^1

关键词: Diethyl carbonates;    Different proportions;    Discharge specific capacity;    Gel polymer electrolytes;    Lithium perchlorate;    Lithium transference numbers;    Poly(vinylidene fluoride-co-hexafluoropropylene);    Solvent casting method;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/213/1/012036/pdf
DOI  :  10.1088/1757-899X/213/1/012036

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

In this paper, poly (vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP) gel polymer electrolyte was fabricated via solvent casting method in order to improve the performance of the lithium-ion batteries. By comparing the physical and electrochemical properties of PVDF-HFP gel polymer electrolyte with three different proportions, the optimization of the PVDF-HFP gel polymer electrolyte was obtained: 10wt% PVDF-HFP - 80wt% tetrahydrofuran (THF) / acetone - 10wt% 1mol L-1lithium perchlorate (LiClO4) in elthylene carbonate (EC) and diethyl carbonate (DEC). The optimized PVDF-HFP gel polymer electrolyte displayed a high conductivity of 1.0610-3S cm-1at room temperature, a high lithium transference number of 0.36 and a good thermal stability within 100C. Moreover, the discharge specific capacity was 135.1 mAh g-1, and the charge / discharge efficiency was 99.1% at 0.1C rate. Therefore, the fabricated PVDF-HFP gel polymer electrolyte was an effective gel polymer electrolyte to be applied on lithium-ion batteries.