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Preparation method for cathode paste of high-capacity lithium ion battery

A lithium-ion battery, cathode slurry technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problem of difficult dispersion of mixed conductive agents, achieve low internal resistance, ensure consistency, and reduce agglomeration effects

Active Publication Date: 2017-01-04
CHINA AVIATION LITHIUM BATTERY LUOYANG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a method for preparing the positive electrode slurry of a large-capacity lithium-ion battery, which can effectively solve the problem that the mixed conductive agent is difficult to disperse

Method used

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  • Preparation method for cathode paste of high-capacity lithium ion battery
  • Preparation method for cathode paste of high-capacity lithium ion battery
  • Preparation method for cathode paste of high-capacity lithium ion battery

Examples

Experimental program
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Effect test

Embodiment 1

[0028] 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: Super-p: KS-6: N-methylpyrrolidone = 93:3.5:2:1.5: The mass ratio of 72.4 is weighed, and the preparation steps are as follows. The mixing equipment in the following steps is a double planetary vacuum mixer. The control method of the slurry temperature is to pass into the constant temperature circulating water on the wall of the mixing tank:

[0029] 1) Before preparing the slurry, first bake lithium iron phosphate, conductive agent Super-p and KS-6 at 115°C for 3 hours under vacuum conditions, bake polyvinylidene fluoride at 85°C for 5 hours under vacuum conditions, and then The temperature is -0.08MPa. After the baking is finished, the temperature is naturally lowered to below 40°C and set aside;

[0030] 2) Dissolve polyvinylidene fluoride in N-methylpyrrolidone equivalent to ...

Embodiment 2

[0038] The preparation method of the positive electrode slurry of the large-capacity lithium-ion battery in this embodiment, each component according to lithium iron phosphate: polyvinylidene fluoride: Super-p: KS-6: N-methylpyrrolidone = 92:4:2.5:1.5: The mass ratio of 69.5 is taken by weighing, and the preparation steps are as follows:

[0039] 1) Before preparing the slurry, first bake lithium iron phosphate, conductive agent Super-p and KS-6 at 120°C for 3.3h under vacuum conditions, and bake polyvinylidene fluoride at 81°C for 5.8h under vacuum conditions , the vacuum degree is -0.083MPa, after the baking is completed, the temperature is naturally lowered to below 40°C, and it is set aside;

[0040] 2) Dissolve polyvinylidene fluoride in N-methylpyrrolidone equivalent to 16 times its own weight, stir and disperse in the glue machine under vacuum for 1.5h, the vacuum degree is -0.083MPa, the stirring revolution speed is 22rpm, disperse The speed is 1100rpm. During the pre...

Embodiment 3

[0048] 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: Super-p: KS-6: N-methylpyrrolidone = 94:3.5:1.5:1: The mass ratio of 78.6 is weighed, and the preparation steps are as follows. The mixing equipment in the following steps is a double planetary vacuum mixer. The control method of the slurry temperature is to pass into the constant temperature circulating water on the wall of the mixing tank:

[0049] 1) Before preparing the slurry, first bake lithium iron phosphate, conductive agent Super-p and KS-6 at 110°C for 3.7h under vacuum conditions, and bake polyvinylidene fluoride at 78°C for 6.3h under vacuum conditions , the vacuum degree is -0.087MPa, after the baking is completed, the temperature is naturally lowered to below 40°C, and it is set aside;

[0050] 2) Dissolve polyvinylidene fluoride in N-methylpyrrolidone equivalent to...

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Abstract

The invention provides a preparation method for cathode paste of a high-capacity lithium ion battery. The preparation method for the paste comprises the following steps: 1) each component is dried firstly; 2) after drying, polyvinylidene fluoride and 1-methyl-2-pyrrolidinone are mixed in proportion and dispersed, and a glue solution A is obtained; 3) Super-p and KS-6 are added to the dispersed glue solution A, obtained mixed paste is stirred uniformly, ground and filtered, and paste B is obtained; 4) a lithium iron phosphate material is added to 60%-70% of the paste B in two times and stirred, and paste C is obtained; 5) after stirring, the residual paste B and 1-methyl-2-pyrrolidinone remaining in total quantity are added to the solution and stirred, and the final paste is obtained. Substances of the paste have good dispersity, a preparation process is simple, preparation of conductive glue and combination of the paste can be performed simultaneously, and the efficiency is increased; the obtained battery is high in energy density, good in safety performance and low in internal resistance, and exertion of the maximum capacity per gram of the lithium ion battery is facilitated.

Description

technical field [0001] The invention relates to a method for preparing a large-capacity lithium-ion battery cathode slurry, and belongs to the technical field of lithium-ion batteries. Background technique [0002] Lithium-ion batteries have high energy density, long cycle life, good rate performance and safety performance, and are environmentally friendly. They are currently the main energy products. Especially the lithium iron phosphate cathode material lithium-ion battery has better cycle life, rate performance and safety performance. Based on its unique advantages, it is widely used in electric vehicles, large-scale energy storage and power tools and other power fields. [0003] The working principle of lithium-ion batteries is based on the electrochemical intercalation / deintercalation reaction. Driven by the voltage drop formed by the two electrodes, lithium ions can be intercalated or deintercalated from the space provided by the electrode material. Directional moveme...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/0525
CPCH01M4/364H01M4/5825H01M4/624H01M4/625H01M10/0525Y02E60/10
Inventor 王云辉崔润东康婷婷庞可可孙敬秦亚伟孙青山马佰瑞
Owner CHINA AVIATION LITHIUM BATTERY LUOYANG
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