Why is Pe Battery Separator China Better?

PE Battery Separator

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Our extensive experience in manufacturing lithium battery separators positions us as a leader in the industry. Currently, we utilize two production methods: the wet method and the dry method, boasting a monthly output capacity of 20 million square meters.

The raw materials for the dry method are characterized by better fluidity and lower molecular weight, meaning they consist of simpler, more manageable components. This method reaches a maximum thermal shutdown temperature of just 135 degrees Celsius with a shrinkage of less than 5% upon heating, which compromises safety for high-power and high-capacity batteries. However, the dry method allows for the creation of three-layer films, which have a thermal shutdown temperature of 135 degrees but can withstand up to 160 degrees thermal stability, providing an additional safety margin of 25 degrees.

On the other hand, the wet method employs non-flowing, high molecular weight materials, achieving a thermal shutdown temperature of 180 degrees Celsius, comparable to ceramic inorganic separators that can manage up to 200 degrees. This ensures the safety necessary for high-power batteries; however, the wet method is limited to single-layer films.

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When producing conventional lithium batteries, the dry method presents certain advantages, including lower costs, reduced pollution, and more consistent pore structure; however, for high-power batteries, the wet method is favored due to its superior safety and lower thermal shrinkage risk.

In essence, separators within batteries are thin membranes integral to performance; they serve more functions than merely acting as plastic films.

Professor Li Xue from the Kunming University of Science and Technology’s Lithium-ion Battery Material Engineering Laboratory highlighted in an interview with the Science and Technology Daily that polyethylene separators are predominantly manufactured using the wet process, whereas polypropylene separators are chiefly produced by the dry process.

An electrochemical cell typically comprises an anode and a cathode separated by an ion-permeable membrane, known as the separator, which is vital for battery functionality. Essentially, the separators must facilitate excellent ion conductivity to enhance energy and power density while demonstrating negligible electronic conductivity to prevent unwanted self-discharge.

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