MULTILAYER, MICROPOROUS POLYOLEFIN MEMBRANE, AND PRODUCTION METHOD THEREOF

摘要

Provided is a microporous polyolefin membrane which has excellent oxidation resistance and electrolyte injection performance and further has excellent permeability and strength balance. The multilayer, microporous polyolefin membrane has a first microporous layer containing polypropylene. The electrolyte injection performance is 20 seconds or less, at least one surface layer is the first microporous layer, and the PP distribution in the first microporous layer is uniform in the in-plane direction.

主权项

1. A multilayer, microporous polyolefin membrane, comprising:
a first surface layer comprising a first microporous layer containing polypropylene, wherein a polypropylene distribution in the first microporous layer is substantially uniform along an in-plane direction, wherein an electrolyte injection performance of the multilayer, microporous polyolefin membrane is 20 seconds or less.