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Acta Phys. -Chim. Sin.  2003, Vol. 19 Issue (12): 1097-1101    DOI: 10.3866/PKU.WHXB20031201
Article     
Research on the Interfacial Properties of Polymer Electrolyte by A.C.Impedance
Wang Zhan-Liang;Tang Zhi-Yuan
School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072
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Abstract  A novel polymer material poly(methyl methacrylate-co-acrylonitrile-co-lithium methacrylate) (PMAML) was synthesized. The polymer electrolytes based on the blend of PMAML and PVDF-HFP (poly(vinylidene fluoride-co-hexafluoropropylene)) were prepared. The structure of PMAML was characterized by FTIR, and the surface morphology of PMAML/PVDF-HFP membrane was observed by SEM. Gelled polymer electrolytes were obtained by soaking PMAML/PVDF-HFP membrane in electrolyte solution. Ambient temperature conductivity of 2.6×10-3 S•cm-1 was obtained. The interfacial properties between the polymer electrolyte and lithium electrode were investigated by A.C. impedance. The effects of storage time, cyclic voltammetry and constant charge on interfacial impedance were studied. The interfacial resistance between polymer electrolyte and lithium electrode increased with the increasing of storage time. But the interfacial impedance decreased after the surface of lithium was refreshed by means of cyclic voltammetry or constant charge. The retention capability of electrolyte solution and the interfacial stability can be improved by introducing PMAML into PVDF-HFP.

Key wordsPolymer electrolyte      Lithium ion battery      A.C. impedance      Interfacial property     
Received: 23 May 2003      Published: 15 December 2003
Corresponding Authors: Tang Zhi-Yuan     E-mail: zytang@tju.edu.cn
Cite this article:

Wang Zhan-Liang;Tang Zhi-Yuan. Research on the Interfacial Properties of Polymer Electrolyte by A.C.Impedance. Acta Phys. -Chim. Sin., 2003, 19(12): 1097-1101.

URL:

http://www.whxb.pku.edu.cn/10.3866/PKU.WHXB20031201     OR     http://www.whxb.pku.edu.cn/Y2003/V19/I12/1097

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