Inorganic‐Organic Composite Solid Polymer Electrolytes

Abstract

Inorganic‐organic composite solid polymer electrolytes (CSPEs) have been prepared from the poly(ethylene oxide) (PEO)‐like electrolytes of the general formula polyvinylidene fluoride‐hexafluoropropylene and ceramic powders. In the PEO‐like electrolytes, PVdF‐HFP is the copolymer of PVdF and HFP, is a nonvolatile oligomeric polyethylene oxide of ∼400 g/mol molecular weight, and LiX is lithium bis(trifluoroethylsulfonyl) imide. Two types of inorganic oxide ceramic powders were used: a highly material of the composition 14 mol % , and the poorly Li‐silicates where M is Ca or Mg and x is 0 or 0.05. The composite electrolytes can be prepared as thin membranes in which the conductivity and good mechanical strength of the inorganic ceramics are complemented by the structural flexibility and high conductivity of organic polymer electrolytes. Excellent electrochemical and thermal stabilities have been demonstrated for the electrolyte films. Li//composite electrolyte// rechargeable cells have been fabricated and cycled at room temperature and 50°C. © 2000 The Electrochemical Society. All rights reserved.