Lithium electronic battery separator has good breathability

As one of the four important components of current lithium battery materials, the lithium electronic battery separator has two main functions: first as an insulating layer to prevent short circuits caused by contact between the positive and negative electrodes, and secondly as a semipermeable layer to improve the positive and negative electrodes. The concentration difference near the battery is conducive to the diffusion of ions, thereby improving the storage efficiency of the battery.

In order to ensure that the internal resistance of the battery is not too large, the separator is required to be completely wetted by the electrolyte used in the battery.

There is no generally accepted testing standard in this area.

It can be roughly judged by the following test: take a typical electrolyte (such as EC: DMC=1:1, 1MLiPF6) and drop it on the surface of the separator to see if the droplets will quickly disappear and be absorbed by the separator. If so, it indicates the wettability Basically meet the requirements.

The lithium electronic battery separator has high strength, high temperature resistance (can be used for a long time in an environment of 150°C), aging resistance, UV resistance, high elongation, good stability and breathability, corrosion resistance, sound insulation, moth-proof, and no Poison and other characteristics.

It also has good chemical stability. In addition to being corroded by acids, it is relatively stable to various other chemical reagents. However, low molecular weight aliphatic hydrocarbons, aromatic hydrocarbons, etc. can soften and swell non-woven fabrics. Chemical stability It also improves with the increase of crystallinity.

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The optimized combination of key technical parameters such as speed ratio, pressure ratio, operating temperature, etc. can realize online control of air permeability, thickness and void ratio according to the ratio and pore-forming medium to meet the different requirements you need. .

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