Lithium ion battery positive pole piece with safety coating and preparation method of lithium ion battery positive pole piece

A technology for lithium ion batteries and positive electrode pieces, applied in the field of electrochemistry, can solve the problems of large lower limit of coating thickness, increase of CPK, deterioration of electrical properties, etc., and achieve the effect of reducing production cost, production cycle and equipment.
CN114464779APending Publication Date: 2022-05-10BATTERO TECH CORP LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
BATTERO TECH CORP LTD
Publication Date
2022-05-10

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Abstract

The invention relates to a lithium ion battery positive pole piece with a safe coating and a preparation method thereof, and the method comprises the following steps: preparation of safe coating slurry: adding a matrix material aerogel material, a high-stability positive pole material, a conductive agent and a binder into a dispersant, and dispersing to obtain the safe coating slurry; preparing positive electrode active material slurry: mixing and stirring raw materials of the positive electrode active material to obtain the positive electrode active material slurry; multi-layer extrusion coating: coating a positive electrode current collector (001) with the safe coating slurry and the positive electrode active material slurry; and cold pressing: carrying out cold pressing on the coated positive current collector (001) to obtain the lithium ion battery positive pole piece with the safety coating. Compared with the prior art, the method has the advantages that the influence on the electrical performance of the battery cell is avoided, the production period is shortened, the production cost is reduced and the like.
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Description

technical field

[0001] The invention relates to the field of electrochemistry, in particular to a positive pole piece of a lithium ion battery with a safety coating and a preparation method thereof. Background technique

[0002] With the large-scale application of lithium-ion batteries, the number of accidents such as fire and explosion is increasing day by day, so the safety function of lithium-ion batteries needs to be improved urgently. Internal short circuit is an important cause of safety accidents in lithium-ion batteries. After internal short circuit occurs due to thermal abuse, mechanical abuse, etc., after the short circuit point generates heat, the temperature rises, triggering a reaction, further heat generation, and the formation of H-T-R (Heat-thermo -reaction) cycle, eventually triggering thermal runaway.

[0003] According to the structure of the short circuit point, the short circuit in the lithium battery is divided into four types: positive electrode-negat...

Claims

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