A kind of polymer lithium ion battery and preparation method of polymer lithium ion battery

Abstract

A polymer lithium ion battery and a preparation method for the polymer lithium ion battery belong to the technical field of polymer lithium batteries. The products of the Diels-Alder reaction or a combination of products and raw materials are used as the coating layer of the separator. The method is as follows: DGFA and DPMBMI are used to prepare product X through Diels-Alder reaction, product X is used as the main material, and a suitable formula is selected to prepare diaphragm slurry; then the slurry is coated on the diaphragm, and the diaphragm The other components of the battery are wound into a battery according to the conventional method. The method of the present invention has low cost, does not increase the production cost of the existing mass-produced batteries, and has a simple process, does not increase additional production processes, is beneficial to realize mass production, and has strong feasibility. The present invention is realized by combining the two advantages of physical and chemical reactions, improves the safety of the battery, can effectively reduce the internal temperature of the battery core, and avoid safety accidents such as fire of the battery core.

Description

technical field [0001] The invention belongs to the technical field of polymer lithium batteries, and particularly relates to a polymer lithium ion battery and a preparation method of the polymer lithium ion battery. Background technique [0002] With the increasing awareness of environmental protection, the use of toxic metals such as lead and cadmium is increasingly restricted, so it is necessary to find new rechargeable batteries that can replace traditional lead-acid batteries and nickel and cadmium batteries. Lithium secondary batteries are naturally the most powerful candidates due to their high energy density and long cycle life. Now, the 5G era is coming, and it is more and more urgent to choose a more suitable new generation of rechargeable batteries. It is worth looking forward to, the advantages of lithium-ion batteries make this hope more and more realistic. [0003] However, the frequent explosion of lithium-ion battery leakage, fire and other accidents in rec...

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Problems solved by technology

[0004] At present, the diaphragm used in the chemical system of polymer lithium-ion batteries has developed into the form of base film + ceramics + glue, but this form is mainly improved from a physical point of view. This form of improvement cannot prevent lithium-ion batteries from Side reactions occur at high temperatures. Once an accident occurs in the battery cell, the internal temperature of the battery cell will rise rapidly, which will cause the diaphragm to shrink, cause an internal short circuit, and then cause safety accidents such as fire.

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