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High-capacity lithium ion battery positive electrode slurry and preparation method and application thereof

A lithium-ion battery and positive electrode slurry technology, which is applied in the direction of electrode manufacturing, battery electrodes, secondary batteries, etc., can solve problems affecting the consistency of slurry, flying dust, adverse effects on the environment and personnel, etc., to achieve excellent conductivity, Guaranteed conductive effect and low internal resistance

Inactive Publication Date: 2018-11-23
CALB CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, with the method of powder pre-mixing, a large amount of dust flying occurs in the early stage of slurry preparation, which has adverse effects on the environment and personnel on the one hand, and on the other hand, the loss of powder due to flying dust also affects the consistency of the slurry

Method used

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  • High-capacity lithium ion battery positive electrode slurry and preparation method and application thereof
  • High-capacity lithium ion battery positive electrode slurry and preparation method and application thereof
  • High-capacity lithium ion battery positive electrode slurry and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0035] The preparation method of the positive electrode slurry of the large-capacity lithium-ion battery in this embodiment, each component is according to lithium iron phosphate: polyvinylidene fluoride: carbon nanotube: conductive carbon black: N-methylpyrrolidone=94:3.5:1:1.5: The mass ratio of 64 is weighed, and the preparation steps are as follows. The mixing equipment in the following steps is a double planetary vacuum mixer, and the control method of the slurry temperature is to pass into the constant temperature circulating water on the wall of the mixing tank:

[0036] 1) Before slurry preparation, first bake lithium iron phosphate and conductive carbon black at 115°C for 3 hours under vacuum conditions, bake polyvinylidene fluoride at 85°C for 5 hours under vacuum conditions, and the vacuum degree is -0.08MPa. After baking, let it cool down to room temperature naturally, and set aside;

[0037] 2) Dissolve polyvinylidene fluoride in an N-methylpyrrolidone solution eq...

Embodiment 2

[0045] The preparation method of the positive electrode slurry of the large-capacity lithium-ion battery in this embodiment, each component is according to lithium iron phosphate: polyvinylidene fluoride: carbon nanotube: conductive carbon black: N-methylpyrrolidone=93:4:1.5:2.5: The mass ratio of 66.7 is taken by weighing, and the preparation steps are as follows:

[0046] 1) Before preparing the slurry, first bake lithium iron phosphate and conductive carbon black at 100°C for 4 hours under vacuum conditions, bake polyvinylidene fluoride at 70°C for 7 hours under vacuum conditions, and the vacuum degree is -0.09MPa. After baking, let it cool down to room temperature naturally, and set aside;

[0047] 2) Dissolve polyvinylidene fluoride in an N-methylpyrrolidone solution equivalent to 14 times its own weight, and stir and disperse in a glue machine under vacuum for 2.5 hours. The vacuum degree is -0.083MPa, and the stirring revolution speed is 23rpm. The dispersion speed is ...

Embodiment 3

[0055] The preparation method of the positive electrode slurry of the large-capacity lithium-ion battery in this embodiment, each component is based on lithium iron phosphate: polyvinylidene fluoride: carbon nanotubes: conductive carbon black: N-methylpyrrolidone=94.5:3:1:1.5: The mass ratio of 79 is taken by weighing, and the preparation steps are as follows:

[0056] 1) Before slurry preparation, first bake lithium iron phosphate and conductive carbon black at 115°C for 3 hours under vacuum conditions, bake polyvinylidene fluoride at 85°C for 5 hours under vacuum conditions, and the vacuum degree is -0.08MPa. After baking, let it cool down to room temperature naturally, and set aside;

[0057] 2) Dissolve polyvinylidene fluoride in an N-methylpyrrolidone solution equivalent to 19 times its own weight, stir and disperse in a glue machine under vacuum for 1.5 hours, the vacuum degree is -0.088MPa, and the stirring revolution speed is 25rpm. The dispersion speed is 1000rpm. Du...

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Abstract

The invention belongs to the technical field of lithium ion battery manufacturing, and particularly provides a preparation method of high-capacity lithium ion battery positive electrode slurry. The preparation method comprises the following steps that various raw materials are weighed and subjected to baking processing before use; polyvinylidene fluoride is dissolved into an N-methyl-2-pyrrolidonesolution with the weight 12-19 times of that of polyvinylidene fluoride, and after stirring and filtering are conducted, an adhesive solution A is obtained; a carbon nanotube solution is added into the adhesive solution A, and after the mixed solution is stirred to be uniform, a conducting adhesive solution B is obtained; the conducting adhesive solution B is added into a stirrer in twice, and stirring is conducted to obtain slurry C; ethyl alcohol is added into the slurry C, the slurry viscosity is adjusted with N-methyl-2-pyrrolidone, and after stirring is conducted, slurry D is obtained; and after the slurry D is subjected to processing of a high-speed dispersion machine, filtration processing and vacuum deformation processing, the final slurry is obtained. According to the preparationmethod, in the production process, preparation of the conducting adhesive solution B and preparation of the final slurry are conducted independently and synchronously, and the production efficiency of the positive electrode slurry is effectively improved; and a lithium ion battery prepared from the slurry is low in internal resistance, high in energy density and beneficial to exertion of the maximum gram capacity.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion battery manufacturing, in particular to a method for preparing a large-capacity lithium-ion battery anode slurry. Background technique [0002] Lithium-ion batteries have the advantages of high working voltage, high energy density, and no environmental pollution, and are currently widely used in our daily lives. Lithium-ion batteries generally include positive and negative pole pieces, separators, electrolytes, and the like. When preparing electrode pole pieces, first mix active materials (lithium iron phosphate, graphite, etc.), conductive agents (conductive carbon black, acetylene black, etc.), binders and solvents to make electrode slurry, and then coat it as required. Cover the surface of the current collector and dry to make pole pieces. [0003] The preparation of slurry is a key process in the production of lithium batteries, and the uniformity of slurry mixing is directly related to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/04H01M4/1397H01M4/1391H01M4/62H01M10/0525
CPCH01M4/04H01M4/1391H01M4/1397H01M4/625H01M10/0525Y02E60/10
Inventor 王云辉王红领孙青山许晓波
Owner CALB CO LTD
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