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Composite conductive paste for anodes and cathodes of lithium ion batteries as well as preparation method for composite conductive paste

A lithium-ion battery, composite conductive technology, applied in the direction of electrode manufacturing, battery electrodes, conductive materials dispersed in non-conductive inorganic materials, etc., can solve the problems of cycle life, energy density, electrochemical performance, etc. Effects of electrochemical performance, internal resistance reduction, and capacity increase

Active Publication Date: 2015-07-22
卡博特高性能材料(珠海)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a conductive paste for positive and negative electrodes of lithium-ion batteries, aiming at solving the problem of existing conductive paste products made of conductive carbon black or carbon nanotubes, or composited with conductive carbon black and carbon nanotubes, Lead to the problem that the main electrochemical performance of the battery, such as cycle life and energy density, has little room for improvement

Method used

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  • Composite conductive paste for anodes and cathodes of lithium ion batteries as well as preparation method for composite conductive paste
  • Composite conductive paste for anodes and cathodes of lithium ion batteries as well as preparation method for composite conductive paste
  • Composite conductive paste for anodes and cathodes of lithium ion batteries as well as preparation method for composite conductive paste

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preparation example Construction

[0025] The composite conductive paste for positive and negative electrodes of lithium-ion batteries provided by the embodiments of the present invention can be prepared by the following method, and of course, other composite conductive pastes for positive and negative electrodes of lithium-ion batteries can also be obtained method for preparation. Correspondingly, the embodiment of the present invention also provides a method for preparing a composite conductive paste for positive and negative electrodes of lithium-ion batteries, comprising the following steps:

[0026] S01. Weigh each component according to the formula of the above-mentioned composite conductive paste for positive and negative electrodes of lithium-ion battery;

[0027] S02. dissolving polyvinylpyrrolidone in N-methylpyrrolidone to obtain a mixed solution;

[0028] S03. Add carbon nanotubes to the mixed solution, perform infiltration and dispersion treatment, and form a dispersion system;

[0029] S04. Add ...

Embodiment 1

[0042] A conductive paste for positive and negative electrodes of lithium-ion batteries, comprising the following formulation components in the following parts by weight:

[0043]

[0044] The preparation method of the composite conductive paste for lithium ion battery positive and negative electrodes is:

[0045] S11. Weigh each component according to the formula of the above-mentioned composite conductive paste for positive and negative electrodes of lithium ion battery;

[0046] S12. In a dehumidified environment at room temperature (humidity lower than 30% R.Hs), pour the solvent N-methylpyrrolidone into the sand mill, slowly pour the dispersant polyvinylpyrrolidone into the sand mill and keep stirring at a low speed Make a solution until the dispersant is completely dissolved;

[0047] S13. Turn on the 20°C cooling circulating water to make the slurry temperature 40°C during the sand milling process, pour the carbon nanotubes into the solvent in the sand mill, and sti...

Embodiment 2

[0051] A conductive paste for positive and negative electrodes of lithium-ion batteries, comprising the following formulation components in the following parts by weight:

[0052]

[0053] The preparation method of the composite conductive paste for lithium ion battery positive and negative electrodes is:

[0054] S21. Weigh each component according to the formula of the above-mentioned composite conductive paste for positive and negative electrodes of lithium-ion batteries;

[0055] S22. In a dehumidified environment at room temperature (humidity lower than 30% R.Hs), pour the solvent N-methylpyrrolidone into the sand mill, slowly pour the dispersant polyvinylpyrrolidone into the sand mill and keep stirring at a low speed Make a solution until the dispersant is completely dissolved;

[0056] S23. Turn on the cooling circulating water at 20°C so that the temperature of the slurry is between 30°C during the sand milling process, pour the carbon nanotubes into the solvent in...

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Abstract

The invention belongs to the technical field of lithium ion batteries, and provides composite conductive paste for anodes and cathodes of the lithium ion batteries as well as a preparation method for the composite conductive paste. The composite conductive paste comprises the following ingredients in parts by weight: 4.0-5.0 parts of carbon nanotubes, 0.5-1.5 parts of reduced expanded graphite, 0.3-1.2 parts of polyvinylpyrrolidone, 88-93 parts of N-methyl pyrrolidone and 0.001-0.01 part of a complexing agent. The composite conductive paste can be combined with active substances to form a favorable conductive network, so that the lithium ion batteries have such electrochemical properties as long cycle life and high energy density.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a composite conductive paste for positive and negative electrodes of lithium ion batteries and a preparation method thereof. Background technique [0002] At present, most of the conductive agents for lithium-ion batteries on the market are made of carbon nanotubes, conductive carbon black or a combination of the two. In terms of the electrochemical performance of the product, if only using conductive carbon black or carbon nanotubes, or using a composite of conductive carbon black and carbon nanotubes, it is difficult to improve the main parameters of the battery such as cycle life and energy density. [0003] As for the composite technology of carbon nanotubes and graphene, many existing patents have reported, such as patent CN102807737A, which mentions that carbon nanotubes and graphene are dispersed in a liquid medium, and then polymer materials are ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/04H01B1/24
CPCH01B1/24H01M4/04H01M4/625H01M10/0525Y02E60/10
Inventor 谢书云谢洪超张伟
Owner 卡博特高性能材料(珠海)有限公司
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