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Preparation method of negative electrode sheet

A negative electrode sheet, the technology of step 2, applied in the field of negative electrode sheet preparation, can solve the problems of poor adhesion between hard carbon materials and copper foil, and achieve the effects of improving electrical conductivity, prolonging cycle life, and uniform and reasonable particle size

Active Publication Date: 2020-05-19
无锡凯帕德瑞科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, hard carbon materials as negative electrodes have received more attention, but the existing hard carbon materials have poor adhesion to copper foil, and there is room for improvement in electrical conductivity, rate performance, and cycle performance.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The preparation method of the negative electrode sheet includes:

[0023] Step 1: Take kerosene and polyglycerin fatty acid ester, add water, mix, and obtain a water-oil mixture;

[0024] Step 2: Add starch to the water-oil mixture obtained in Step 1, mix well, add amylase, react for 3 hours, add adipic acid, react for 2 hours, and dry the product;

[0025] Step 3. Put the product obtained in step 2 into a reaction furnace, heat to 800°C, and keep it for 1 hour, pass acetylene gas into the reaction furnace, heat to 1000°C, and react for 3 hours to obtain a hard carbon material;

[0026] Step 4. Take the porous copper foil, spray the aniline hydrochloride solution around the holes of the porous copper foil, and then spray the ammonium persulfate solution around the holes, react for 5 hours, wash, and dry to obtain the polyaniline modified porous copper foil;

[0027] Step 5. Take the hard carbon material, sodium carboxymethyl cellulose, and styrene butadiene rubber emulsion obtain...

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PUM

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Abstract

The invention discloses a preparation method of a negative electrode plate, which comprises the following steps: step 1, taking kerosene and polyglycerol fatty acid ester, adding water, and mixing toobtain a water-oil mixed solution; step 2, adding starch into the water-oil mixed solution, uniformly mixing, adding amylase and adipic acid, and carrying out a reaction; step 3, putting the product into a reaction furnace, and introducing acetylene gas to obtain a hard carbon material; step 4, taking a porous copper foil, spraying an aniline hydrochloride solution around the holes of the porous copper foil, spraying an ammonium persulfate solution around the holes, reacting for 5 hours, washing and drying to obtain polyaniline modified porous copper foil; 5, taking the hard carbon material obtained in the step 3 as a negative electrode active material, mixing the hard carbon material with sodium carboxymethylcellulose and styrene butadiene rubber emulsion, and adding water to obtain negative electrode slurry; and 6, coating the two surfaces of the polyaniline modified porous copper foil obtained in the step 4 with the negative electrode slurry obtained in the step 5, drying, and compacting to obtain the negative electrode plate. The conductivity of the negative electrode plate can be improved, and the rate capability and the cycle performance of the battery are improved.

Description

Technical field [0001] The invention relates to the technical field of electrode materials. More specifically, the present invention relates to a method for preparing a negative electrode sheet. Background technique [0002] Lithium batteries have the advantages of high energy density and long cycle life, and have been widely used in digital products. The lithium battery is composed of positive electrode sheet, negative electrode sheet, separator and electrolyte. At present, hard carbon materials as negative electrodes have received more attention, but the existing hard carbon materials have poor adhesion to copper foil, and there is room for improvement in electrical conductivity, rate performance, and cycle performance. Therefore, it is urgent to design a negative electrode sheet that can overcome the above-mentioned defects to a certain extent. Summary of the invention [0003] An object of the present invention is to provide a method for preparing a negative electrode sheet...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/583H01M4/66H01M4/70H01M4/1393H01M4/04H01M10/052
CPCY02E60/10
Inventor 陈名柱盛琦柳丕云
Owner 无锡凯帕德瑞科技有限公司