Preparation and characterization of the porous solid polymer electrolyte of PAN/PVA by phase inversion

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• 作者：F. A. Amaral ; R. M. Sousa ; L. C. T. Morais…
• 关键词：Solid polymer electrolyte ; Lithium ; ion batteries ; Thin films ; Phase inversion ; Polyacrylonitrile and poly (vinyl acetate)
• 刊名：Journal of Applied Electrochemistry
• 出版年：2015
• 出版时间：August 2015
• 年：2015
• 卷：45
• 期：8
• 页码：809-820
• 全文大小：1,119 KB
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• 作者单位：F. A. Amaral (1)
  R. M. Sousa (1)
  L. C. T. Morais (1)
  R. G. Rocha (1)
  I. O. Campos (1)
  W. S. Fagundes (1)
  C. N. P. Fonseca (1)
  S. C. Canobre (1)
  
  1. LAETE - Laboratório de Armazenamento de Energia e Tratamento de Efluentes, Instituto de Química, Universidade Federal de Uberlandia -UFU, Av. Jo?o Naves de ávila, 2121, Uberlandia, MG, CEP 38408-100, Brazil
  
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Electrochemistry
  Physical Chemistry
  Industrial Chemistry and Chemical Engineering
  
• 出版者：Springer Netherlands
• ISSN：1572-8838

文摘

Porous solid polymer electrolytes (SPE) were prepared in the form of thin films by phase inversion by direct immersion in non-solvent acetone or methanol, using a copolymer of polyacrylonitrile and poly (vinyl acetate) in ethylene carbonate/dimethylene carbonate (EC/DMC 1:1 v/v) as plasticizer, which contained different LiClO4 percentages. SEM images revealed pores on a micrometer scale (average diameter around 2?μm) distributed inside and on the surface of the films. XRD patterns revealed a predominantly amorphous behavior, favorable to the ionic conduction process. Thin films presented low glass transition temperatures (T g), between ?7 and ?8?°C. Thin films showed a thermal stability higher than those obtained for the gels. Thin films (average thickness of 22?μm) showed ionic conductivity around 10?0 S cm? and 10? S cm? by immersion in acetone and methanol, respectively. The porous thin films when were swollen in liquid electrolyte, the maximum ionic conductivity value reached was of 2.5?×?10? S cm? with 10?% LiClO4 at 25?°C. The oxidation of the SPE only occurred around 4.5?V for the gel and 4.8?V versus Li/Li+ for the SPE thin film, thus resulting in a wide electrochemical stability. A stable passive layer at the interface between the polymer electrolyte and lithium metal was formed within the first 10?h and maintained during 4?weeks. The cell containing LiCoO2 in thin-film electrolyte presented the one well-known plateaux for the Li-ion intercalation in the 4?V region.