Preparation and Swelling Performance of TPU Lithium Battery Swelling Tape
The swelling properties and solubility resistance of a series of industrial thermoplastic polyurethane(TPU)films in lithium ion battery electrolyte were studied.TPU films with different proportions of H-HTPB were prepared with a polyester diol and a small amount of hydrogenated hydroxy-terminated poly1,4-butadiene(H-HTPB)as mixture,reacted with diphenylmethane diisocyanate and 1,4-butadiol.The effects of hardness and nNCO/nOH(R value)on swelling property and solubility resistance were studied.The results showed that the polyester TPU had the best swelling performance but poor hot electrolyte solubility resistance.By adding 10%H-HTPB,the swelling ratio of 90A hardness polyester TPU film reached 30%at room temperature after 2 h,and the film kept intact at 85℃for 1 h.
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