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Cathode slurry and manufacturing method thereof, and lithium ion battery

A technology of negative electrode slurry and negative electrode, applied in the field of negative electrode slurry and preparation, can solve the problems of inability to carry out industrialization and low efficiency, and achieve the effect of reducing weight and thickness and improving energy density

Inactive Publication Date: 2019-05-31
蜂巢能源(武汉)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If it is necessary to coat on a thinner copper foil substrate, the drying effect can only be achieved by reducing the temperature, wind frequency and coating speed, but this efficiency is very low and cannot be industrialized

Method used

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  • Cathode slurry and manufacturing method thereof, and lithium ion battery
  • Cathode slurry and manufacturing method thereof, and lithium ion battery
  • Cathode slurry and manufacturing method thereof, and lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0040] Preparation of negative electrode slurry (addition of urea)

[0041] Step 1) Mix 0.75kg sodium carboxymethyl cellulose and 50kg deionized water, and first apply glue to a 60L glue machine, the specific method is as follows: first add 50kg deionized water, add 0.75kg sodium carboxymethyl cellulose , at a revolution stirring speed of 25rpm, and at a dispersion speed of 2100rpm, stir for 180 minutes;

[0042] Step 2) 50kg graphite and 0.5kg Super-P are mixed, and specific method is as follows: first add 20kg graphite in 100L mixing tank, add Super-P again, stir 20 minutes under the revolution stirring speed of 20rpm; Then, add remaining 30kg of graphite was stirred for 20 minutes at a revolution stirring speed of 20rpm.

[0043] Step 3) Add 30kg of the mixture prepared in step 1) to the mixture prepared in step 2), then add 4.8kg of deionized water, and stir for 60 minutes at a revolution stirring speed of 25rpm and a dispersion speed of 800rpm .

[0044] Step 4) join 2...

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Abstract

The invention relates to a cathode slurry and a manufacturing method thereof. The cathode slurry comprises, by weight, 100 parts of a cathode activated carbon material, 0.5 to 2 parts of a conductiveagent, 1 to 5 parts of urea, 0.5 to 2 parts of a binder, 1 to 1.5 parts of a thickener and 110 to 125 parts of water. The cathode slurry can be coated on a thinner current collector substrate withoutaffecting coating efficiency so that the weight of the substrate can be reduced and simultaneously the coating efficiency is improved. The slurry and the method can be applied to industrial production.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a negative electrode slurry and a preparation method. Background technique [0002] With the demand for increasing energy density in the market, it is necessary to reduce the weight of a single cell and use a thinner copper foil substrate. [0003] In the case of copper foil substrates with a thickness of no more than 10 μm currently used in the industry, during the negative electrode coating and baking process, water evaporation generally depends on a certain temperature and a certain frequency of wind speed. Due to the good thermal conductivity of the copper foil itself, the water evaporates faster, and the thermal conductivity near the blank area is better than that of the middle coating area, and the edge pole pieces often appear dry and cracked. If a thinner copper foil substrate is used, the pole pieces are more likely to crack during the baking process when the temper...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/62H01M4/587H01M10/0525H01M4/133
CPCY02E60/10
Inventor 刘升李华韩辉
Owner 蜂巢能源(武汉)有限公司
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