There are many factors to consider in selecting an excellent lithium-ion battery separator material ,
mainly include:
(1) insulation;
(2) It has excellent mechanical properties and is easy to process;
(3) Stable chemical properties;
(4) It has a good barrier effect on the migration of particles, colloids or other soluble substances between the positive and negative electrodes ;
(5) Can be quickly infiltrated by electrolyte;
(6) Uniform physical properties;
(7) The resistance is small.
These characteristics can effectively reduce the energy loss of the battery during high current discharge. Therefore, it is necessary to weigh the requirements of battery performance , safety, cost and other factors, and comprehensively consider various factors to select an appropriate separator material.
At present, lithium-ion battery separators mainly include woven membranes, non-woven membranes (non-woven fabrics), microporous membranes, composite membranes, and separator papers. Due to the high porosity, low resistance, high tear strength, good acid and alkali resistance, good elasticity and retention of aprotic solvents of polyolefin separators, PE, PP The research of polymers such as Li-ion battery separators is active.
