Effect on properties of PVDF-HFP based composite polymer electrolyte doped with nano-SiO2
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- 作者：Yan Li (1)
Xinhai Li (1)
Huajun Guo (1)
Zhixing Wang (1)
Tao Li (1) - 关键词：PVDF ; HFP ; Composite polymer electrolyte ; Nano ; SiO2 ; Lithium ion battery
- 刊名：Iranian Polymer Journal
- 出版年：2014
- 出版时间：June 2014
- 年：2014
- 卷：23
- 期：6
- 页码：487-494
- 全文大小：
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Xinhai Li (1)
Huajun Guo (1)
Zhixing Wang (1)
Tao Li (1)
1. School of Metallurgy and Environment, Central South University, Changsha, 410083, People’s Republic of China - ISSN：1735-5265
文摘
Various kinds of nano-SiO2 using different catalysts were obtained and characterized by scanning electron microscope (SEM) technique. The results showed that the nano-SiO2 using NH3·H2O as catalyst presented the best morphology. Poly(vinylidenefluoride-co-hexafluoropropylene) (PVDF-HFP) based composite polymer electrolyte (CPE) membranes doped with different contents of nano-SiO2 were prepared by phase inversion method. The as-prepared CPE membranes were immersed into 1.0 M LiPF6-EC/DMC/EMC electrolytes for 0.5?h to be activated. The physicochemical and electrochemical properties of the CPEs were characterized by SEM, X-ray diffraction (XRD), electrochemical impedance spectroscopy (EIS), and linear sweep voltammetry (LSV) techniques. The results indicate that the CPEs doped with 10?% nano-SiO2 exhibit the best performance. SEM micrographs showed that the CPE membranes have uniform surface with abundant interconnected micro-pores, and the uptake ratio was up to 104.4?wt%. EIS and LSV analysis also showed that the ionic conductivity at room temperature and electrochemical stability window of the modified membrane can reach 3.372?mS?cm? and 4.7?V, respectively. The interfacial resistance R i was 670?Ω?cm? in the first day, then increased to a stable value of about 850?Ω?cm? in 10?days storage at room temperature. The Li/As-fabricated CPEs/LiCoO2 cell also showed good charge–discharge performance, which suggested that the prepared CPE membranes can be used as potential electrolytes for lithium ion batteries.