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What is the separator for lithium-ion batteries?

In the structure of lithium-ion batteries, the separator is one of the key inner components. The performance of the separator determines the interface structure, internal resistance, and other characteristics of lithium-ion batteries, directly affecting the capacity, cycling, and safety performance of the battery. Excellent performance of the separator plays an important role in improving the comprehensive performance of the battery.

The important use of separators is to separate the positive and negative electrodes of lithium-ion batteries, prevent short circuits caused by contact between the two poles, and also have the function of allowing electrolyte ions to pass through. The material of the separator is non-conductive, and its physical and chemical properties have a significant impact on the performance of the battery. Different types of batteries require different separators. Regarding the lithium-ion battery series, due to the electrolyte being an organic solvent system, it is necessary to have a membrane material that is resistant to organic solvents. Generally, high-strength filmed polyolefin porous membranes are used.

According to different physical and chemical properties, lithium-ion battery separator materials can be divided into several categories: woven film, non-woven film (non-woven fabric), microporous film, composite film, separator paper, roller compacted film, etc.

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