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A graphene positive electrode slurry and an efficient controllable preparation method thereof

A positive electrode slurry and graphene technology, which is applied in the direction of graphene, battery electrodes, electrical components, etc., to achieve the effects of shortening the slurry mixing process time, improving manufacturing efficiency, and simple process

Inactive Publication Date: 2019-01-18
AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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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 design and provide a graphene positive electrode slurry and an efficient and controllable preparation method for the defects of the current positive electrode active material body and the deficiency of the positive electrode mixing process. Under the premise of equipment, the unique two-dimensional structure and excellent conductivity of graphene are used to modify the current positive electrode active materials to improve the rate performance and cycle life of lithium battery positive electrode materials.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Preparation of LiFePO 4 / Graphene cathode slurry, the steps of the preparation process are as follows:

[0025] Step 1. Add 5kg dry lithium iron phosphate powder and 100g PVDF dry powder to the dual planetary stirring disperser, and stir at a speed of 15r / min for 30min;

[0026] Step 2, adding 0.6kg of graphene composite conductive paste (the solid content of graphene composite conductive paste is 6%, wherein the dispersant accounts for 1%, and the remaining conductive carbon materials account for 5%), so that the solid content in the mixture reaches 90.1%, Stir at a speed of 15r / min for wetting treatment for 30min;

[0027] Step 3, adding 0.8kg of graphene composite conductive paste (the solid content of graphene composite conductive paste is 6%, wherein the dispersant accounts for 1%, and the remaining conductive carbon materials account for 5%), so that the solid content in the mixture reaches 79.8%, While stirring at a speed of 15r / min, disperse at a speed of 300r...

Embodiment 2

[0031] Preparation of LiNi 0.5 co 0.2 mn 0.3 o 2 / Graphene cathode slurry, the steps of the preparation process are as follows:

[0032] Step 1. Add 5kg LiNi to the double planetary stirring disperser 0.5 co 0.2 mn 0.3 o 2 Dry powder, PVDF dry powder 100g, stir at a speed of 15r / min for 30min;

[0033] Step 2, adding 0.6kg of graphene composite conductive paste (the solid content of graphene composite conductive paste is 6%, wherein the dispersant accounts for 1%, and the remaining conductive carbon materials account for 5%), so that the solid content in the mixture reaches 90.1%, Stir at a speed of 15r / min for wetting treatment for 30min;

[0034] Step 3, adding 0.8kg of graphene composite conductive paste (the solid content of graphene composite conductive paste is 6%, wherein the dispersant accounts for 1%, and the remaining conductive carbon materials account for 5%), so that the solid content in the mixture reaches 79.8%, While stirring at a speed of 15r / min, dis...

Embodiment 3

[0038] Preparation of LiNi 0.8 co 0.15 Al 0.05 o 2 / Graphene cathode slurry, the steps of the preparation process are as follows:

[0039] Step 1. Add 5kg LiNi to the double planetary stirring disperser 0.8 co 0.15 Al 0.05 o 2 Dry powder, PVDF dry powder 100g, stir at a speed of 15r / min for 30min;

[0040] Step 2, adding 0.6kg of graphene composite conductive paste (the solid content of graphene composite conductive paste is 6%, wherein the dispersant accounts for 1%, and the remaining conductive carbon materials account for 5%), so that the solid content in the mixture reaches 90.1%, Stir at a speed of 15r / min for wetting treatment for 30min;

[0041]Step 3, adding 0.8kg of graphene composite conductive paste (the solid content of graphene composite conductive paste is 6%, wherein the dispersant accounts for 1%, and the remaining conductive carbon materials account for 5%), so that the solid content in the mixture reaches 79.8%, While stirring at a speed of 15r / min, ...

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Abstract

The invention relates to a graphene positive electrode slurry and an efficient controllable preparation method thereof. A graphene positive electrode slurry is prepared from positive electrode activematerial, graphene and other conductive carbon materials, binder (PVDF), N-Methyl pyrrolidone (NMP) composites. the method includes adding a proper amount of positive active material dry powder and PVDF dry powder into a double-planet stirrer and disperser, and slowly stirring for a certain time. Then adding proper amount of conductive slurry in batches, stirring, dispersing, wetting, kneading andwet mixing; At last, an appropriate amount of NMP solvent is added to adjust that viscosity of the slurry, and the slurry is quickly stirred and dispersed for a long time to obtain the final slurry.The graphene in the graphene positive electrode slurry is well dispersed and can form a good coating effect on the particles of the positive electrode active material, and can form a high-efficiency charge transport network in the electrode, thereby accelerating the diffusion speed of electrons, reducing the polarization of the battery, and improving the electrochemical performance of the battery.The slurry viscosity of the method has high controllability and better stability and rheological properties.

Description

technical field [0001] The invention relates to a graphene cathode slurry and a high-efficiency controllable preparation method, belonging to the technical field of battery manufacturing. Background technique [0002] Graphene is a new type of two-dimensional nanomaterial with super conductive properties and is currently the best conductive material. At the same time, it has ultra-high electron mobility (200000cm 2 / V.S), thermal conductivity (5000W / m.K). Utilizing graphene's excellent electrical conductivity, large specific surface area, and unique two-dimensional network structure to modify the positive electrode active material will greatly improve the electrical conductivity of the material, effectively shorten the electron transmission path during battery charge and discharge, and accelerate the connection between the two. transfer speed. This is of great significance for improving the rate performance and cycle life of lithium batteries. Graphene is used as the mai...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/583H01M4/62H01M10/0525C01B32/182
CPCC01B32/182H01M4/583H01M4/625H01M10/0525Y02E60/10
Inventor 南文争燕绍九王晨陈翔
Owner AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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