PRESSURE-SENSITIVE ADHESIVE TAPE OR SHEET FOR WINDING FIXTURE OF LITHIUM ION BATTERY ELEMENT

摘要

PROBLEM TO BE SOLVED: To provide a pressure-sensitive adhesive tape or sheet for winding fixture of a lithium ion battery element impregnating the element with an electrolyte in a short time by exhibiting high permeability for the electrolyte and having sufficient adhesion.

SOLUTION: The pressure-sensitive adhesive tape or sheet for the winding fixture of the lithium ion battery element has a pressure-sensitive adhesive layer composed of a soluble region dissolving in an electrolyte solvent and an insoluble region not dissolving in the electrolyte solvent on one surface of a substrate. The pressure-sensitive adhesive layer comprises, e.g. the soluble region within the range of 10-80% of the whole surface of the pressure-sensitive adhesive layer and the soluble region is preferably provided at the tape ends or so as to communicate with the ends of the tape. In the lithium ion battery, the element is subjected to the winding fixture with the pressure-sensitive tape or sheet for the winding fixture of the lithium ion battery element.

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