In recent years, the commercialization of polymer electrolytes for lithium-ion batteries has been achieved. Polymer electrolytes serve as channels for ion migration and serve as separators between positive and negative electrode materials in lithium-ion batteries. Polymer electrolyte can be divided into solid polymer electrolyte and gel polymer electrolyte. As a practical polymer electrolyte membrane, it must meet the following requirements: ① it has high ionic conductivity to reduce the internal resistance of the battery; ② The transfer coefficient of lithium ions remains basically unchanged to eliminate concentration polarization; ③ Negligible electronic conductivity to ensure effective isolation between electrodes; ④ The electrode material has high chemical and electrochemical stability; ⑤ Low price, suitable chemical composition, ensuring environmental friendliness.

　　Due to the low room temperature conductivity of solid polymer electrolytes, it is difficult to commercialize them. The gel polymer electrolyte realizes ion conduction through the liquid electrolyte molecules fixed in the polymer network, which not only has the stability of solid polymer, but also has the high ion conductivity of liquid electrolyte, showing a good application prospect.

　　Polymer electrolytes are combined with polyethylene and polypropylene membranes to form polymer lithium-ion battery separators. Colloidal polymers are covered or filled in microporous membranes, which have superior performance compared to polymer electrolyte lithium-ion batteries without separators, such as: ① providing better protection during internal short circuits; ② Can reduce the thickness of the electrolyte layer; ③ Providing sufficient safety during overcharging; ④ It has good mechanical properties and thermal stability. It can be seen that polyethylene and polypropylene membranes play a very important role in ion battery separators due to their special structure and performance, unless there is a truly liquid free polymer electrolyte present.

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