Study on performance of a novel P(VDF-HFP)/SiO2 composite polymer electrolyte using urea as pore-forming agent
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- 作者：Yan Li ; Wei Xiao ; Xinhai Li ; Chang Miao ; Huajun Guo ; Zhixing Wang
- 关键词：P(VDF ; HFP) ; Composite polymer electrolyte ; Urea ; Nano ; SiO2 ; Lithium ; ion battery
- 刊名：Ionics
- 出版年：2014
- 出版时间：September 2014
- 年：2014
- 卷：20
- 期：9
- 页码：1217-1224
- 全文大小：1,388 KB
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Wei Xiao (1) (2)
Xinhai Li (1)
Chang Miao (2)
Huajun Guo (1)
Zhixing Wang (1)
1. School of Metallurgy and Environment, Central South University, Changsha, 410083, People’s Republic of China
2. College of Chemistry and Environmental Engineering, Yangtze University, Jingzhou, 434023, People’s Republic of China - ISSN：1862-0760
文摘
Novel poly(vinylidene fluoride-co-hexafluoropropylene) (P(VDF-HFP))-based composite polymer electrolyte (CPE) membranes doped with different contents of nano-SiO2 using urea as a pore-forming agent were prepared by phase inversion method, and the desired CPEs were obtained by being immersed into 1.0?M LiPF6-EC/DMC/EMC electrolytes for 0.5?h. The physicochemical properties of the CPEs were characterized by scanning electron microscope (SEM), X-ray diffraction (XRD), electrochemical impedance spectroscopy (EIS), and linear sweep voltammetry (LSV). The results show that the CPEs doped with 10?% nano-SiO2 exhibit the best performance, in which the SEM images of the as-prepared polymer membranes present homogeneous surface and abundant micropores; the uptake ratio is up to 107.4?%; EIS and LSV analysis also show that the ionic conductivity at room temperature and electrochemical stability window of the modified membrane can reach 3.652?mS cm? and 5.0?V, respectively; the interfacial resistance R i is 380?Ω cm? in the first day,then increases rapidly to a stable value about 500?Ω cm? in a 5-day storage at room temperature. The Li/As-fabricated CPEs/LiCoO2 cell also shows excellent charge-discharge performance, which suggests that it can be a potential electrolyte for the lithium-ion battery.