Insulating coating composition, preparation method of insulating coating, positive electrode sheet and lithium ion battery

A lithium-ion battery and insulating coating technology, applied in the field of materials, can solve problems such as short circuit, burr or falling material piercing the diaphragm, extrusion, etc.

Active Publication Date: 2019-10-22
江苏海四达电源有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of the above-mentioned prior art, the purpose of the present invention is to overcome the burrs in the punching process of the battery pole pieces in the prior art, which will cause the positive and negative pole pieces to expand during the charging and discharging process of the battery and cause extrusion, and then burrs will appear. Or the falling material pierces the separator and causes the problem of short circuit, thereby providing an insulating coating composition that can effectively prevent the produced lithium ion battery from burrs and falling off, and greatly improve the service performance of the obtained lithium ion battery, Preparation method of insulating coating, positive electrode sheet and lithium ion battery

Method used

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  • Insulating coating composition, preparation method of insulating coating, positive electrode sheet and lithium ion battery
  • Insulating coating composition, preparation method of insulating coating, positive electrode sheet and lithium ion battery
  • Insulating coating composition, preparation method of insulating coating, positive electrode sheet and lithium ion battery

Examples

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preparation example Construction

[0025] The present invention also provides a method for preparing an insulating coating, wherein the insulating coating is prepared from the above-mentioned composition. The preparation method may be conventional mixing, for example, stirring and mixing directly.

[0026] Of course, in a more preferred embodiment, in order to further improve the punching performance of the prepared insulating coating after being applied to the lithium-ion battery, the preparation method includes:

[0027] 1) mixing the adhesive with the first part of the solvent to prepare the glue;

[0028] 2) mixing the glue prepared in step 1) with the insulating material to prepare the coating material;

[0029] 3) mixing the coating blank prepared in step 2) with the second part of solvent to obtain an insulating coating;

[0030] Wherein, based on the total weight of the solvent, the amount of the first part of the solvent used is 80% by weight to 90% by weight, and the amount of the second part of sol...

preparation example 1

[0042] 1) 2% by weight of polyvinylidene fluoride and 60% by weight of N-methylpyrrolidone were placed in a blender and stirred for 180 minutes to prepare glue;

[0043] 2) Place the prepared glue at a temperature of 25°C for 300 minutes to mature;

[0044] 3) After adding 30% by weight of alumina to the above-mentioned cured glue, stir for 300min to prepare the coating blank;

[0045] 4) Add 8% by weight of N-methylpyrrolidone to the coating raw material prepared in step 3) and stir evenly to obtain a mixture M1;

[0046] 5) Pass the mixture M1 prepared in step 4) through a 150-mesh sieve to obtain an insulating coating A1.

preparation example 2

[0048] Prepare according to the preparation method of Preparation Example 1, the difference is that the aluminum oxide is replaced with boehmite, the amount of polyvinylidene fluoride is 3% by weight, and the amount of boehmite is 40% by weight. In step 1), N - The amount of methylpyrrolidone used is 50% by weight, and the amount of N-methylpyrrolidone used in step 4) is 7% by weight to obtain an insulating coating A2.

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Abstract

The invention relates to the field of materials, and particularly discloses an insulating coating composition, a preparation method of an insulating coating, a positive plate and a lithium-ion battery, wherein the composition is prepared from an insulating material, a binder and a solvent. According to the preparation method, the insulating coating is made through mixing the insulating material, the binder and the solvent; subsequently, the made insulating coating and positive slurry and / or negative slurry are simultaneously coated on a pole piece of a battery; subsequently, an embryonic form of the pole piece of the battery, which is coated with the insulating coating, is punched; the conditions of the burrs and the stock fall of the pole piece of the battery, which is obtained after being punched in such a way, are effectively controlled; the problem that the made lithium-ion battery easily generates a short circuit is solved.

Description

technical field [0001] The invention relates to the field of materials, in particular to an insulating coating composition, a preparation method of the insulating coating, a positive electrode sheet and a lithium ion battery. Background technique [0002] Pure electric vehicles using lithium-ion power batteries are the main force of new energy vehicles at present, and the two bottlenecks restricting the development of pure electric vehicles are the safety and energy density of lithium-ion batteries. In order to further increase the energy density of lithium-ion power batteries and improve the performance of lithium-ion power batteries, many power battery manufacturers use winding lithium-ion battery production processes. However, the preparation process of the wound lithium-ion battery involves the punching process of the pole piece, and as the frequency of use of the mold used for punching increases, the risk of edge burrs and material loss also increases. If burrs appear ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/62H01M10/0525H01M4/13
CPCH01M4/13H01M4/62H01M4/623H01M10/0525Y02E60/10
Inventor 沈晓彦唐元鑫王兴威沙永香何兴
Owner 江苏海四达电源有限公司
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