Battery diaphragm and its preparation method and lithium ion secondary battery containing the diaphragm

Abstract

A battery separator includes the substrate and holes distributed on it, in which, the substrate contains polyimide. The battery separator of this invention uses polyimide which is a new material bearing high temperature as substrate, so that it has excellent chemical stability, high temperature, good permeability and high mechanical strength. The lithium-ion rechargeable batteries using this invention don't appear short circuit even in 150 deg. C, thus this battery separator can be used for high-capacity and power batteries.

Description

technical field

[0001] The invention relates to a battery diaphragm, a preparation method thereof and a lithium ion secondary battery containing the diaphragm. Background technique

[0002] With its high specific energy, high voltage, small size, light weight, and no memory, lithium-ion secondary batteries have achieved tremendous development in the past ten years and have become one of the main energy sources for communication electronic products. However, under abuse conditions, lithium-ion secondary batteries are prone to safety hazards such as smoke, fire, explosion, and even personal injury, so high-capacity and power lithium-ion batteries have not been widely used. Therefore, improving the safety of lithium-ion batteries is the key to the development of lithium-ion batteries.

[0003] The battery separator plays a role in preventing the positive and negative electrodes from directly contacting the short circuit in the lithium-ion battery. In order to improve the safe...

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