SEPARATOR FOR BATTERY AND BATTERY

摘要

PROBLEM TO BE SOLVED: To provide a separator for a battery obtained through polymer including hydrophilic group and a battery with improved performance by restraining a polymer containing a hydrophilic group from isolating in an electrolyte solution. SOLUTION: With the separator for the battery with a part of the surface of an unwoven fabric made of at least a kind of polyolefin system fabric coated with hydrophilic group containing ultra-branched polymer, the hydrophilic group containing ultra-branched polymer should be either grafted in a fabric or make itself formed in a bridging structure, so that it does not get isolated in a electrolyte solution.