Composite conductive agent and preparation method thereof, and lithium-ion battery positive electrode

A composite conductive agent and positive electrode technology, which is applied in the direction of non-aqueous electrolyte battery electrodes, battery electrodes, secondary batteries, etc., can solve the problems of battery performance degradation, achieve stable performance, reduce DC internal resistance, and increase gram capacity.

Inactive Publication Date: 2019-05-17
上海力信能源科技有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Purpose of the invention: In response to the above problems, one of the purposes of the present invention is to provide a composite conductive agent to solve the technical problem of battery performance degradation

Method used

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  • Composite conductive agent and preparation method thereof, and lithium-ion battery positive electrode
  • Composite conductive agent and preparation method thereof, and lithium-ion battery positive electrode
  • Composite conductive agent and preparation method thereof, and lithium-ion battery positive electrode

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A composite conductive agent, including the following components in weight percentage: 1.6% conductive carbon black, 0.28% carbon nanotube, 0.12% graphene; 0.5% dispersant; 97.5% solvent. Wherein, the dispersant is polyvinylpyrrolidone, and the solvent is N-methylpyrrolidone.

[0029] A preparation method of composite conductive agent, comprising the following steps:

[0030] 1) According to the formula quantity, the composite powder of conductive carbon black, carbon nanotubes and graphene is made by hydrothermal method;

[0031] The hydrothermal method is as follows: add conductive carbon black and deionized water to the hydrothermal kettle, stir at room temperature for 15 minutes, add carbon nanotubes and continue stirring at room temperature for 10 minutes, add graphene and continue stirring at room temperature for 30 minutes, and then stir at 180 ° C After 3 hours, the obtained product was cooled to room temperature, filtered, washed and dried, put into a tube fur...

Embodiment 2

[0039] A composite conductive agent, comprising the following components in weight percentage: 0.5% conductive carbon black, 0.56% carbon nanotube, 0.24% graphene; 0.8% dispersant; 97.9% solvent. Wherein, the dispersant is polyvinylpyrrolidone, and the solvent is N-methylpyrrolidone.

[0040] A preparation method of composite conductive agent, comprising the following steps:

[0041] 1) According to the formula quantity, the composite powder of conductive carbon black, carbon nanotubes and graphene is made by hydrothermal method;

[0042] The hydrothermal method is as follows: add conductive carbon black and deionized water to the hydrothermal kettle, stir at room temperature for 20 minutes, add carbon nanotubes and continue stirring at room temperature for 20 minutes, add graphene and continue stirring at room temperature for 15 minutes, and then stir at 200 ° C After 4 hours, the obtained product was cooled to room temperature, filtered, washed and dried, put into a tube fu...

Embodiment 3

[0050] A composite conductive agent, comprising the following components in weight percentage: 1.0% conductive carbon black, 0.42% carbon nanotube, 0.18% graphene; 0.7% dispersant; 97.7% solvent. Wherein, the dispersant is polyvinylpyrrolidone, and the solvent is N-methylpyrrolidone.

[0051] A preparation method of composite conductive agent, comprising the following steps:

[0052] 1) According to the formula quantity, the composite powder of conductive carbon black, carbon nanotubes and graphene is made by hydrothermal method;

[0053]The hydrothermal method is as follows: add conductive carbon black and deionized water to the hydrothermal kettle, stir at room temperature for 10 minutes, add carbon nanotubes and continue stirring at room temperature for 15 minutes, add graphene and continue stirring at room temperature for 20 minutes, and then stir at 190°C After 3 hours, the obtained product was cooled to room temperature, filtered, washed and dried, put into a tube furna...

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Abstract

The invention discloses a composite conductive agent and a preparation method thereof, and a lithium-ion battery positive electrode. The composite conductive agent comprises following components by weight percentage: 0.5-1.6% of conductive carbon black, 0.28-0.56% of carbon nanotubes, 0.12-0.24% of graphene, 0.5-0.8% of dispersing agent, and 97.5-97.9% of solvent. The preparation method of the composite conductive agent comprises following steps: 1) preparing composite powder according to a formula amount; 2) adding the composite powder into the solvent to obtain a mixture; and 3) performing ultrasonic dispersion on the mixture to obtain the composite conductive agent. The composite conductive agent is advantageous in that the composite conductive agent comprises the conductive carbon black, the carbon nano-tubes and the graphene, the particle size of the conductive carbon black is small, the conductive carbon black is in point-shaped connection, the carbon nanotubes are in linear connection, the graphene is in planar connection, a coupling effect is fully produced among the conductive carbon black, the carbon nanotubes and the graphene, the gram volume of the active substance of the positive electrode is improved, and the rate and the circulation property of the lithium iron phosphate battery are optimized.

Description

technical field [0001] The invention relates to the field of composite conductive agents, in particular to a composite conductive agent, a preparation method thereof, and a positive electrode of a lithium ion battery. Background technique [0002] At present, lithium iron phosphate batteries have the advantages of high energy density, long cycle performance, good safety, and low cost, and are widely used in energy storage systems and electric vehicles. However, when the lithium iron phosphate battery is discharged at a high rate, the internal heating of the battery cell will cause the cycle performance to decrease. In order to improve the cycle performance of the lithium iron phosphate battery, the content of conductive carbon black in the positive and negative electrode slurry will be increased, but this will reduce the heat generation of the battery. At the same time, it also reduces the capacity density of the battery and reduces the performance of the lithium-ion battery...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/13H01M10/0525
CPCY02E60/10
Inventor 郑丹程君陈启多陈星刘晶
Owner 上海力信能源科技有限责任公司
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