Abstract
A solvent-free, cross-linked polymer electrolyte based on polyurethane acrylate (PUA) containing LiTFSI has been prepared and tested in an all-solid-state lithium-polymer battery It was found that the new polymer electrolyte could be directly membranous in the absence of any solvent and could be coated directly on a lithium foil or a composite cathode to form an ultrathin membrane of 10-50 μm. The PUA electrolyte membrane was thermally stable to 220°C at the system and had a higher ionic conductivity than a polyethylene oxide based polymer electrolyte below 60°C. The cell exhibited a high initial capacity (190 mAh/g), a charge-discharge efficiency of above 99%, and could be operated at 40°C. © 2004 The Electrochemical Society. All rights reserved.
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