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7. Coated diaphragm

Diaphragms are crucial for the safety of lithium-ion batteries, as they require good electrochemical and thermal stability, as well as high wettability of the electrolyte during repeated charging and discharging processes.

Coated diaphragm refers to the application of adhesives such as PVDF or ceramic alumina on the base film. The purpose of coating the diaphragm is:

1. Improve the heat and shrinkage resistance of the diaphragm to prevent large area short circuits caused by diaphragm shrinkage;

2. The coating material has low thermal conductivity, preventing certain thermal runaway points in the battery from expanding and forming an overall thermal runaway.

8. Ceramic alumina

In the coating separator, ceramic coating separator is important for the power lithium battery system, so its market growth space is greater than that of adhesive coated separator. The market demand for its core material, ceramic alumina, will significantly increase with the rise of ternary power lithium batteries.

The purity, particle size, and morphology of ceramic alumina used for coating membranes have high requirements. Products from Japan and South Korea are more mature, but the price is more than twice that of domestically produced alumina. There are currently multiple companies in China developing ceramic alumina, hoping to reduce import dependence.

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