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Rechargeable battery and application thereof

A technology for rechargeable batteries and positive electrodes of batteries, applied in the field of H01M4, which can solve the problems of inability to achieve fusion of conductive materials, low adhesion of electrode adhesives, and increased shrinkage difference, etc., to improve low thermal stability, increase curing speed, The effect of improving adhesion

Pending Publication Date: 2022-07-08
江苏环峰电工材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, for electrode materials of lithium-ion batteries, it is usually necessary to use electrode binders to bond with conductive materials, but if the adhesion of electrode binders is low, then it cannot achieve good adhesion to conductive materials. If the adhesion of the electrode binder is high, it is not conducive to the penetration of the liquid electrolyte, which will affect the electron migration and increase the difference in shrinkage between it and the pole piece matrix, which will eventually lead to the failure of the battery. performance degradation

Method used

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  • Rechargeable battery and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] This example provides a rechargeable battery, the rechargeable battery includes a battery positive electrode, a battery negative electrode, an electrolyte and a separator.

[0045] The raw materials of the positive electrode of the battery include a positive electrode binder and a pole piece base.

[0046] The raw materials of the positive electrode binder include alkylamines, carboxyl compounds, modified substances, diglycidyl ethers, and active electrode components.

[0047] Alkylamine is a mixture of 1,2-propylenediamine and N-acetylethylenediamine, wherein the weight ratio of 1,2-propylenediamine and N-acetylethylenediamine is 1:0.5.

[0048] The carboxyl compound is a mixture of 2,3,3',4'-diphenyl ether tetracarboxylic dianhydride and bicyclo(2.2.2)oct-7-ene-2,3,5,6-tetracarboxylic dianhydride, wherein The weight ratio of 2,3,3',4'-diphenyl ether tetracarboxylic dianhydride and bicyclo(2.2.2)oct-7-ene-2,3,5,6-tetracarboxylic dianhydride is 1:3.2 .

[0049] The ...

Embodiment 2

[0059] This example provides a rechargeable battery, which is different from Example 1 in that in the positive electrode of the battery, the alkylamine is 1,2-propanediamine, which is a combination of 1,2-propanediamine and N-acetylethylenediamine. mixture, wherein the weight ratio of 1,2-propanediamine and N-acetylethylenediamine is 0.8:0.5.

[0060] The carboxyl compound is a mixture of 2,3,3',4'-diphenyl ether tetracarboxylic dianhydride and bicyclo(2.2.2)oct-7-ene-2,3,5,6-tetracarboxylic dianhydride, wherein The weight ratio of 2,3,3',4'-diphenyl ether tetracarboxylic dianhydride and bicyclo(2.2.2)oct-7-ene-2,3,5,6-tetracarboxylic dianhydride is 0.7:3.1 .

[0061] The raw materials of the negative electrode of the battery, in parts by weight, include 14 parts of graphite, 3 parts of carbon black and 0.7 part of a negative electrode binder.

[0062] In the electrolyte, the mixed ester solution includes ethylene carbonate (EC), dimethyl carbonate (DMC) and ethyl methyl car...

Embodiment 3

[0064] This example provides a rechargeable battery, which is different from Example 1 in that in the positive electrode of the battery, the alkylamine is 1,2-propanediamine, which is a combination of 1,2-propanediamine and N-acetylethylenediamine. mixture, wherein the weight ratio of 1,2-propanediamine and N-acetylethylenediamine is 1.1:0.75.

[0065] The carboxyl compound is a mixture of 2,3,3',4'-diphenyl ether tetracarboxylic dianhydride and bicyclo(2.2.2)oct-7-ene-2,3,5,6-tetracarboxylic dianhydride, wherein The weight ratio of 2,3,3',4'-diphenyl ether tetracarboxylic dianhydride and bicyclo(2.2.2)oct-7-ene-2,3,5,6-tetracarboxylic dianhydride is 1.2:3.2 .

[0066] The raw materials of the negative electrode of the battery, in parts by weight, include 19 parts of graphite, 4.5 parts of carbon black and 1.2 parts of a negative electrode binder.

[0067] In the electrolyte, the mixed ester solution includes ethylene carbonate (EC), dimethyl carbonate (DMC) and ethyl methyl...

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Abstract

The invention relates to H01M4, in particular to a rechargeable battery and application thereof. The rechargeable battery comprises a battery positive electrode, a battery negative electrode, an electrolyte and a diaphragm. The ratio of the raw materials of the negative electrode of the battery is controlled, and the negative electrode of the battery is matched with the positive electrode of the battery to form the battery, so that the electrical performance of the battery is improved, especially the first charging capacity, the first coulombic efficiency and the capacitance retention ratio of 0.5 C charging and discharging for 100 times; and the mixed ester solution with a specific proportion is used as the electrolyte, so that the swelling problem of the adhesive in the electrolyte can be reduced, the adhesive force of the adhesive and the electrode is improved, and the electrical property of the battery is further improved. In the system of the rechargeable battery provided by the invention, all the substances synergistically play a role, the problems that the lithium hexafluorophosphate electrolyte in the electrolyte is low in thermal stability, sensitive to moisture and easy to generate decomposition reaction are also improved, and the battery is simple in process and low in cost.

Description

technical field [0001] The present invention relates to H01M4, and more particularly, the present invention relates to a rechargeable battery and its application. Background technique [0002] Since the commercialization of lithium-ion batteries in the 1990s, as a device with good energy storage effect, it has been widely used in various electronic products. With the advancement and development of science and technology, lithium-ion batteries have also been pushed to more fields. Electrodes and electrolytic materials are an important part of lithium-ion batteries. As the core factors restricting battery performance, they have always been the focus of research by scholars. [0003] Patent No. CN111370654B provides a composite graphite negative electrode material, lithium ion battery and its preparation method and application. By controlling the particle size and ratio of the added single particle graphite and secondary particle graphite, the obtained electrode material is us...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0525H01M4/13
CPCH01M10/0525H01M4/13Y02P70/50
Inventor 陈文博季加进唐立律
Owner 江苏环峰电工材料有限公司
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