The four main materials of lithium-ion batteries are cathode material, anode material, diaphragm and electrolyte. Battery diaphragm is one of the four key raw materials of lithium-ion batteries. Battery diaphragm acts as an electronic barrier to prevent direct contact between cathode and cathode, permits free passage of lithium ions in the electrolyte, and also acts as a barrier for lithium-ion batteries. It also plays a vital role in ensuring the safe operation of batteries.

It is worth mentioning that the largest profit margin of the four main materials of lithium ion batteries is the diaphragm. Therefore, domestic enterprises have stepped into the field of diaphragm, hoping to get a share of the power battery dividend.