What are the characteristics of lithium battery separators?

The lithium battery separator must have the characteristics of electronic insulation to ensure the mechanical separation of the positive and negative electrodes; it has a certain pore size and porosity to ensure low resistance and high ion conductivity, and has a good permeability to lithium ions; Since the solvent of the electrolyte is a strong polar organic compound, the diaphragm must be resistant to electrolyte corrosion, have sufficient chemical and electrochemical stability; have good wettability to the electrolyte and have sufficient liquid absorption and moisture retention; have sufficient mechanical properties , Including puncture strength, tensile strength, etc., but the thickness is as small as possible; the current status of the lithium battery separator material market in China in 2019 can be said to be very bad. First, due to the impact of the previous national investment policy, the output is seriously surplus; The second is the impact of the national new energy industry policy. The state's subsidies for powered vehicles have decreased, and the subsidy requirements have increased. Some lithium battery manufacturers have encountered major problems in the capital chain. Lithium battery manufacturers have also affected diaphragm suppliers in terms of price, quality and billing period Put forward new requirements. In 2018, nearly 13 billion square meters of separator production in the domestic lithium battery separator market was released. The actual supply market was at least nearly 10 billion, while the actual demand for domestic separators was only about 3 billion square meters. Some new separator manufacturers are facing In the face of a serious test, product prices have fallen before the products have opened the market; production has not been released, and production will be suspended. Disclaimer: Some pictures and content of articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous: How to use low-temperature lithium battery pack correctly?