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With the support of the major project of energy storage battery under the National 863 Program, the research team of bionic energy and energy storage system of the Qingdao Bioenergy and Process Research Institute, Shenyang Branch of the Chinese Academy of Sciences has made breakthrough progress in the field of power lithium-ion battery separators after more than three years of research, successfully developed the power lithium-ion battery separators of high safety flame-retardant biomass composites with independent intellectual property rights, and reached the scale of pilot production. Domestic experts highly evaluate the biomass composite material separator developed by the team as a brand new material system and process method. According to researcher Cui Guanglei, the head of the Team leader, they will complete the improvement of self-developed equipment and process optimization before the end of the year, and it is expected to form a production capacity of 300000 square meters next year.

Qingdao Energy uses biomass cellulose as the raw material, adopts independent intellectual property rights of melt blown wet coupling technology process, develops relevant production and processing equipment, and develops high safety and low cost biomass composite material membranes. The separator has good electrolyte wetting performance, heat resistance, and flame retardancy, and its battery rate and cycling performance are far superior to commercial polyolefin separators. The flame retardant biomass composite membrane has not been reported abroad yet.

It is reported that the separator is a key component of power lithium-ion batteries and a determining factor affecting battery capacity, cycle life, and safety performance. At present, the mainstream products of commercialized lithium-ion battery separators are polyethylene, polypropylene microporous films, and polypropylene/polyethylene/polypropylene three-layer microporous composite films, with core technologies monopolized by large foreign companies. The low porosity, transverse tensile strength, liquid retention, and thermal stability of commercial polyolefin separators cannot fully meet the requirements of rapid battery charging and discharging, and pose significant safety hazards.

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