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Citation: ZHANG Guo-Qiang, MA Li, WU Zhong-Jie, ZHANG Hai-Yan, NI Pei. Electrochemical Behaviour of the Composite Polymer Electrolyte P(VDF-HFP)-PMMA/CaCO₃(SiO₂)[J]. Acta Physico-Chimica Sinica, ;2009, 25(03): 555-560. doi: 10.3866/PKU.WHXB20090326 shu

Electrochemical Behaviour of the Composite Polymer Electrolyte P(VDF-HFP)-PMMA/CaCO₃(SiO₂)

1.
Faculty of Material and Energy, Guangdong University of Technology, Guangzhou 510006, P, R. China; McNair Technology Co., Ltd., Dongguan 523800, Guangdong Province, P. R. China

Received Date: 3 September 2008
Available Online: 4 December 2008

Electrochemical behavior of the composite polymer electrolyte (CPE) prepared from polyvinylidene fluoride-co-hexafluoropropylene(P(VDF-HFP)), poly(methyl methacrylate) (PMMA), and nanosized CaCO3 (SiO2) particles was investigated by confocal laser scanning microscopy, X-ray diffraction (XRD), cyclic voltammetry (CV), and electrochemical impedance spectroscopy (EIS). Results show that CPEs have many micropores, and that the addition of PMMA can increase the absorption potential of the liquid electrolyte and therefore improve ionic conductivity. The best performance of CPE was found at a P(VDF-HFP)/PMMAmass ratio of 1:1. The composite polymer electrolyte that was produced by adding nanosized CaCO3 and SiO2 to a P(VDF-HFP)-PMMA base keeps the amorphous structure of the original polymer base. The ionic conductivity of CPE can reach 3.42 mS·cm-1 and the electrochemical window can be up to 4.8 V at room temperature. A test on Li/CPE/GMS cells showed that the composite polymer electrolyte was compatible with graphite anodes. The battery made from Li/CPE(CaCO3)/LiCoO2 was shown to have a superior rate discharging performance to Li/CPE(SiO2)/LiCoO2.
- Li-ion battery,
- Composite polymer electrolyte,
- P(VDF-HFP)-PMMA,
- Nanosized CaCO3,
- Nanosized SiO2
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Electrochemical Behaviour of the Composite Polymer Electrolyte P(VDF-HFP)-PMMA/CaCO3(SiO2)

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通讯作者: 陈斌, bchen63@163.com

Electrochemical Behaviour of the Composite Polymer Electrolyte P(VDF-HFP)-PMMA/CaCO₃(SiO₂)