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Method for uniformly mixing lithium titanate slurry containing carbon nanotubes

A technology of lithium titanate and nanotubes is applied in the field of preparation of high-rate lithium-ion battery mixed slurry, which can solve the problems of affecting battery performance, peeling of pole pieces, and inability to uniformly mix the slurry.

Active Publication Date: 2019-08-23
河南电池研究院有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem solved by the present invention is to provide a uniform mixing method of carbon nanotube-containing lithium titanate slurry with simple process and low cost, which effectively solves the problem of high specific surface lithium titanate and carbon nanotube application As a result, the slurry cannot be mixed uniformly, resulting in more dry powder and scratches in the coating process, peeling of the electrode sheet during the baking process, and affecting battery performance.

Method used

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  • Method for uniformly mixing lithium titanate slurry containing carbon nanotubes
  • Method for uniformly mixing lithium titanate slurry containing carbon nanotubes
  • Method for uniformly mixing lithium titanate slurry containing carbon nanotubes

Examples

Experimental program
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Effect test

Embodiment 1

[0023] Step S1: Mix the binder with the solvent, control the temperature of the stirring tank at 30°C by circulating hot water, control the vacuum at -0.06MPa, control the revolution speed at 15rpm, control the rotation speed at 2700rpm, and control the time at 1.5h , wherein the binding agent is polytetrafluoroethylene Solef5130, the weight percentage of the binding agent in the final target product mixed slurry is 4%, the solvent is NMP, and the solid content of the prepared glue is controlled at 8 %;

[0024] Step S2: Add carbon nanotubes to the glue prepared in step S1 to prepare a conductive glue. The vacuum degree of the stirring tank is controlled at -0.06MPa, the revolution speed is controlled at 30rpm, the rotation speed is controlled at 4000rpm, and the time is controlled at 1h. The weight percentage of carbon nanotubes in the final target product mixed slurry is 1%;

[0025] Step S3: Dry premix the conductive agent and the main material, add the main material and t...

Embodiment 2

[0033]Step S1: Mix the binder with the solvent, control the temperature of the stirring tank at 30°C by circulating hot water, control the vacuum degree at -0.06MPa, control the revolution speed at 20rpm, control the rotation speed at 3000rpm, and control the time at 1.5h , wherein the binding agent is polytetrafluoroethylene HSV900, the weight percentage of the binding agent in the final target product mixed slurry is 5%, the solvent is NMP, and the solid content of the prepared glue is controlled at 8 %;

[0034] Step S2: Add carbon nanotubes to the glue prepared in step S1 to prepare a conductive glue. The vacuum degree of the stirring tank is controlled at -0.06MPa, the revolution speed is controlled at 30rpm, the rotation speed is controlled at 4000rpm, and the time is controlled at 1h. The weight percentage of carbon nanotubes in the final target product mixed slurry is 1.5%;

[0035] Step S3: Dry premix the conductive agent and the main material, add the main material ...

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Abstract

The invention discloses a method for uniformly mixing lithium titanate slurry containing carbon nanotubes, and belongs to the technical field of preparation of high-rate lithium ion battery mixed slurry. According to the invention, the main points of the technical scheme is that the method comprises the following steps: preparing a glue solution by taking a binder and a solvent as raw materials, adding the carbon nanotubes to prepare a conductive glue solution, and mixing a mixed dry material formed by the conductive agent and a main material with the conductive glue solution according to a specific process to obtain the lithium titanate slurry containing the carbon nanotubes. The preparation method effectively solves the problems that slurry cannot be uniformly mixed due to the application of high-specific-surface-area lithium titanate and carbon nanotubes, so that more dry powder and scratches appear in the coating process, the pole piece peeling phenomenon occurs in the baking process, the battery performance is influenced and the like.

Description

technical field [0001] The invention belongs to the technical field of preparation of high-rate lithium-ion battery mixed slurry, and in particular relates to a uniform mixing method of lithium titanate slurry containing carbon nanotubes. Background technique [0002] With the promotion of new energy vehicles, the lithium-ion battery industry has developed rapidly. But at the same time, based on the user's demand for fast charging and long cycle life, it also brings great challenges to the battery industry. Conventional lithium-ion batteries use graphite as the main material of the negative electrode, but because the graphite negative electrode forms a solid electrolyte film during the charging process, it will slow down the migration rate of lithium ions, and at the same time, the migration rate of lithium ions in the graphite negative electrode is low, making the battery in large Serious polarization occurs during power charging and discharging, resulting in reduced capac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/583H01M4/62H01M10/0525B01F3/12B82Y30/00B82Y40/00
CPCH01M4/364H01M4/583H01M4/625H01M4/485H01M10/0525B82Y30/00B82Y40/00B01F23/511Y02E60/10
Inventor 杨书廷刘红涛刘显卿董红玉
Owner 河南电池研究院有限公司
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