Preparation method for high-capacity lithium ion battery positive electrode tab

A technology of lithium ion battery and positive electrode sheet, which is applied in electrode manufacturing, battery electrode, electrolyte storage battery manufacturing and other directions, can solve the problems of low charging voltage and cumbersome manufacturing process, and achieve high compaction density, simple process and high efficiency. Effect

Inactive Publication Date: 2016-09-07
QUANZHOU JINTION ELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The invention provides a method for preparing a high-capacity lithium-ion battery positive plate, the main purpose of which is to overcome the defects of existing lithium batteries, such as a gram specific capacity of only 140-150mAh / g, low charging voltage, and cumbersome manufacturing process, etc.

Method used

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  • Preparation method for high-capacity lithium ion battery positive electrode tab
  • Preparation method for high-capacity lithium ion battery positive electrode tab
  • Preparation method for high-capacity lithium ion battery positive electrode tab

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] 1. Prepare positive electrode slurry according to the following steps

[0043] Weigh the following solid raw materials according to the mass fraction ratio: 94.5% lithium cobaltate, 2% SP, 1% VGCF, 2.5% Solef5130, and then weigh the organic solvent NMP whose mass fraction is 1 / 3 of the sum of the above solid raw materials; and Put each solid raw material into a vacuum oven at 120°C for 4 hours to dry, and the vacuum is -0.1 MPa; then add lithium cobaltate, SP, VGCF and Solef5130 into the mixing tank of the planetary mixer, and stir at high speed for 60 minutes; then add 60% of Organic solvent NMP, vacuum high-speed stirring for 120min, stirring temperature is 45 degrees; then add 30% organic solvent NMP, vacuum high-speed stirring for 60min, stirring temperature is 30 degrees; finally the remaining 10% organic solvent NMP, slurry viscosity adjustment, viscosity The range is 5000-8000 cPa.

[0044] 2. Prepare negative electrode slurry according to the following steps

...

Embodiment 2

[0060] The steps and procedures for preparing the assembled battery in this example are the same as in Example 1, except that the mass ratio of the positive electrode is: 95% lithium cobalt oxide, 2% SP, 1% VGCF, 2% Solef5130, and the mass ratio of the negative electrode is: 95% % silicon-carbon alloy material, 1% SP, 1.3% CMC, 2.2% SBR, and the addition of cyclohexylbenzene (CHB) in the electrolyte is 3%.

[0061] The table below shows the compacted densities of the battery-grade sheets of Example 1 and Example 2.

[0062]

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Abstract

The present invention provides a preparation method for a high-capacity lithium ion battery positive electrode tab. The method comprises: 1) adding a positive electrode material, a conductive agent and a binder into a planet stirrer, and stirring the mixture at high speed to obtain positive electrode powder; 2) weighing organic solvent, adding 40-60% of a total mass of the organic solvent into the positive electrode powder, stirring the mixture under vacuum at high speed to obtain positive electrode paste; 3) adding 20-30% of the total mass of the organic solvent into the positive electrode paste, controlling a stirring temperature at 25-33 DEG C, and stirring the mixture under vacuum at high speed for 60-100 min; 4) adding the remaining organic solvent into the positive electrode paste by several times to adjust viscosity, and sieving the mixture to obtain positive electrode slurry; and 5) coating positive and negative surfaces of a positive electrode metal current collector with the positive electrode slurry, and drying and rolling the surfaces, so as to obtain a high-capacity lithium ion battery positive electrode tab. By the method, which is provided by the present invention, of stirring the powder material in advance, then kneading the material and finally dispersing the material, material components with different densities can be mixed more uniformly, and higher efficiency is achieved.

Description

technical field [0001] The invention relates to the technical field of lithium-ion battery manufacturing, in particular to a method for preparing a high-capacity lithium-ion battery positive plate that provides energy for digital products such as smart phones, ultrabooks, and tablet computers. Background technique [0002] Lithium-ion batteries are a new generation of secondary batteries since the 1990s. They have the advantages of high energy density, long cycle life, high operating voltage, no memory effect, small self-discharge, and wide operating temperature range. They are used in mobile communications, mobile Computers, electric vehicles, aerospace, biomedical engineering and other fields have been widely used and are one of the key products of high-tech. In recent years, various electronic products have gradually developed towards miniaturization, intelligence and multi-function, such as smartphones, ultrabooks, tablet computers, etc., which put forward higher require...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/1391H01M4/485H01M4/62
CPCH01M4/04H01M4/1391H01M4/485H01M4/625H01M10/0525H01M10/058Y02E60/10
Inventor 陈端典陈文明黄昌荣
Owner QUANZHOU JINTION ELECTRONICS
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