THERMALLY SHRINKABLE TUBE AND LITHIUM ION SECONDARY CELL COATED WITH THE TUBE

摘要

PROBLEM TO BE SOLVED: To provide a thermally shrinkable tube which is used appropriately for coating cells and others, and excellent in heat resistance and coating properties by an automatic machine, and provide a lithium ion secondary cell coated with the tube. SOLUTION: In a thermally shrinkable tube prepared by stretching an unoriented tube of a mixture consisting chiefly of an ionomer resin, a storage modulus of elasticity E' at 30 deg.C is 6×10<9> -3×10<10> dyne/cm<2> , at 80 deg.C is at most 7×10<8> dyne/cm<2> , and at 100 deg.C is at least 1×10<7> dyne/cm<2> .