New progress in research and development of polymer battery electrolyte materials in China

Efficient, safe and reliable power battery is the bottleneck restricting the new near-zero emission automobile industry and one of the “short boards” of new energy vehicles. The biggest safety hazard of the current power battery is the thermal runaway of the battery. The Qingdao Institute of Bioenergy and Process Technology of the Chinese Academy of Sciences has developed a phase in the development of a high-safety power battery polymer electrolyte material system to solve this safety problem. Progress and is rapidly advancing its industrialization process.

The existing lithium ion battery liquid electrolyte system cannot meet the requirements of the power battery for high energy, high power and safety. The R&D team of Qingdao Energy Storage Industry Technology Research Institute put forward the research and development idea of ​​“rigid and flexible” and developed a series of new polymer electrolyte systems, which solved the above bottleneck problem well and greatly improved the safe use performance.

“Rigid and soft” is the use of “rigid” skeleton materials, such as polyimide, aramid, polyarylsulfonamide, glass fiber and cellulose, to improve the mechanical properties and dimensional thermal stability of the battery. Use "soft" ion transport materials such as polyethylene oxide (PEO), polyvinylidene fluoride-hexafluoropropylene (PVDF-HFP), polymethyl methacrylate (PMMA), cyanoacrylate and poly Propylene carbonate (PPC) and the like impart excellent ion conductivity and interface stability, and achieve a win-win effect by "combining", that is, compounding two or more materials, thereby achieving a comprehensive improvement in comprehensive performance, thereby meeting the requirements of a power battery. .

Qingdao Energy Storage Research Institute and Zhongtian Technology Co., Ltd. cooperated to develop industrial technology of high-capacity high-safety power or energy storage single cells (energy density up to 300 Wh/kg), and jointly promote high-energy and high-safety all-solid-state power batteries. Industrialization. At the same time, the R&D team applied this design concept to actively explore the development of a new generation of ultra-high energy density lithium-space secondary batteries, and has made good progress.

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