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Three-electrode lithium ion battery and preparation method thereof

A lithium-ion battery and three-electrode technology, which is applied in the field of lithium-ion batteries, can solve problems such as high difficulty and easy damage to the interface structure of the battery cell, improve test accuracy and stability, avoid difficult production, and stabilize the interface for charging and discharging The effect of voltage

Pending Publication Date: 2020-02-21
东莞维科电池有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] One of the purposes of the present invention is to provide a three-electrode lithium-ion battery for the deficiencies of the prior art, which solves the problems of difficulty in the production process and the easily damaged interface structure of the battery core, and greatly improves the test accuracy and stability

Method used

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  • Three-electrode lithium ion battery and preparation method thereof
  • Three-electrode lithium ion battery and preparation method thereof
  • Three-electrode lithium ion battery and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Preparation of positive electrode sheet: high-voltage 4.4V positive electrode active materials lithium cobalt oxide (purchased from Tianjin Bamo), CNTs (carbon nanotubes), conductive carbon black and PVDF (polyvinylidene fluoride) were prepared in a mass ratio of 97:0.5:1 : 1.5 Mix evenly, then disperse in N-methyl-2-pyrrolidone (NMP) to obtain a positive electrode slurry; evenly coat the positive electrode slurry on both sides of the aluminum foil, roll and cut to obtain a positive electrode sheet, and finally Ready to use after baking and vacuum drying.

[0039] Preparation of negative electrode sheet: The negative electrode material (purchased from Jiangxi Zichen), conductive carbon black, CMC (carboxymethyl cellulose) and SBR / PAA were mixed uniformly according to the mass ratio of 95:1.5:1.5:2, and then dispersed in deionized water. The negative electrode slurry is obtained in water; the negative electrode slurry is evenly coated on both sides of the copper foil, an...

Embodiment 2

[0043] The difference from Example 1 is the preparation of the reference electrode (lithium titanate pole piece):

[0044] Lithium titanate, conductive acetylene black and PVDF (polyvinylidene fluoride) are uniformly mixed in a mass ratio of 95:3:2, and then dispersed in N-methyl-2-pyrrolidone (NMP) to obtain lithium titanate slurry; The lithium titanate slurry is evenly coated on the aluminum foil to form a lithium titanate slurry layer. After rolling and slitting, the lithium titanate pole piece is obtained, and the nickel electrode lugs and the diaphragm are wrapped by transfer welding. Finally, it is baked and vacuum dried. for later use.

[0045] The rest are the same as in Embodiment 1, and are not repeated here.

Embodiment 3

[0047] The difference from Example 1 is the preparation of the reference electrode (lithium titanate pole piece):

[0048] Lithium titanate, carbon nanotubes and PVDF (polyvinylidene fluoride) are uniformly mixed in a mass ratio of 92:5:3, and then dispersed in N-methyl-2-pyrrolidone (NMP) to obtain lithium titanate slurry; The lithium titanate slurry is evenly coated on the aluminum foil to form a lithium titanate slurry layer. After rolling and slitting, the lithium titanate pole piece is obtained, and the nickel electrode lugs and the diaphragm are wrapped by transfer welding. Finally, it is baked and vacuum dried. for later use.

[0049] The rest are the same as in Embodiment 1, and are not repeated here.

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Abstract

The invention belongs to the technical field of lithium ion batteries, and particularly relates to a three-electrode lithium ion battery. The three-electrode lithium ion battery comprises a battery shell, a bare battery cell and a lithium titanate pole piece, wherein the bare battery cell and the lithium titanate pole piece are packaged in the battery shell, the bare battery cell is provided witha positive electrode tab and a negative electrode tab which are led out of the battery shell, and the lithium titanate pole piece is provided with a reference electrode tab which is led out of the battery shell. Compared with the prior art, the problem that the interface structure of the battery cell is easy to damage is solved, and the test accuracy and stability are greatly improved. Besides, the invention further provides a preparation method of the three-electrode lithium ion battery, which is easy to operate and solves the problem of high difficulty in the manufacturing process of the existing three-electrode lithium ion battery.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a three-electrode lithium ion battery and a preparation method thereof. Background technique [0002] Lithium-ion batteries have the advantages of high energy density and long cycle life, and are widely used in portable electronic devices, and have also been promoted in fields such as electric vehicles. [0003] However, the application of each part of the material is now approaching the limit of use, and at the same time, consumers have also put forward higher requirements for mutual consideration of battery energy density, cycle life and environmental applicability. The current battery design is also changing ideas, improving the rate performance of the battery to meet the demand for fast charging, so as to achieve an increase in capacity in actual use. This puts forward higher requirements for negative electrode materials, and the risk of lithium pre...

Claims

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Application Information

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IPC IPC(8): H01M10/0525H01M4/131H01M10/058G01R31/389G01R31/385
CPCH01M10/0525H01M4/131H01M10/058G01R31/389G01R31/385Y02E60/10Y02P70/50
Inventor 占克军王恒朱坤庆计阳楚英张涛
Owner 东莞维科电池有限公司
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