Lithium ion battery diaphragm material and preparation method thereof

Abstract

The invention discloses a lithium ion battery diaphragm material and a preparation method thereof, and belongs to the technical field of battery component performance research. In order to solve the problems of short service life and poor safety of a current lithium ion battery, the diaphragm material comprises the following components: 73%-82% of an organic solvent, 12%-17% of a diaphragm base material and 6%-10% of a diaphragm additive. The method comprises the following steps: uniformly mixing the organic solvent and the diaphragm base material, fully stirring in an oil bath pan at 50-80 DEG C for 30-60 minutes till that the diaphragm base material is completely dissolved, and naturally cooling to a room temperature; dissolving the diaphragm additive into the same amount of the organic solvent, and enabling the mass fraction of the diaphragm additive to be 6%-10%; and adding the additive solution into a slurry, and fully stirring at the room temperature for 12-24 hours. Ethyl cyanoacrylate is adopted as the diaphragm additive, the additive and trace water molecules are subjected to an anionic polymerization reaction to generate a long and strong chain, and a large number of hydrogen bonds are generated among the molecules so that the mechanical strength of the prepared composite diaphragm is greatly improved.

Description

technical field [0001] The invention belongs to the technical field of performance research of battery components, and in particular relates to a lithium-ion battery diaphragm material and a preparation method thereof. Background technique [0002] Lithium-ion batteries (LIBs) are gradually replacing traditional primary batteries due to the pursuit of energy-intensive, efficient, and economical energy storage, and are playing an increasingly prominent role in consumer electronics, electric vehicles, and large-scale power supplies. However, the low Coulombic efficiency, short cycle life, and safety issues still exist before the widespread application of LIBs, which also drives a lot of research on high-performance component materials (electrodes, electrolytes, and separators) of LIBs. Although serving as an inactive component in LIBs, it is well known that the separator between the anode and cathode has an important impact on Li-ion transport and has a great influence on the ...

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Problems solved by technology

[0003] The purpose of the present invention is to solve the problems of short life and poor safety of lithium-ion batteries at present, and provide a lithium-ion battery diaphragm material and its preparation method, which can fully improve the charge-discharge cycle performance of lithium-ion batteries and the mechanical properties of the diaphragm. strength

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