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Carbon nano tube conductive agent sizing for negative electrode material of lithium ion battery and preparation method thereof

A lithium-ion battery, carbon nanotube technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of low compaction density of negative electrode materials, achieve good conductivity, reduce polarization resistance, and shorten diffusion paths. Effect

Active Publication Date: 2018-08-28
南昌新苏纳米材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Graphite is anisotropic, and the graphite conductive agent used in the market, the small ion size and complex agglomeration structure of carbon black lead to a low compaction density of the negative electrode material

Method used

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  • Carbon nano tube conductive agent sizing for negative electrode material of lithium ion battery and preparation method thereof
  • Carbon nano tube conductive agent sizing for negative electrode material of lithium ion battery and preparation method thereof
  • Carbon nano tube conductive agent sizing for negative electrode material of lithium ion battery and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0031] Option One:

[0032] Step (1). First turn on the dehumidifier, adjust the indoor humidity to below 15%, fully dry the equipment and instruments used, and clean them with NMP;

[0033] Step (2): Weigh 925g of NMP, put it into the stirring tank, add 3g of PVP during the stirring process, turn on the ultrasonic wave, after fully dissolved, add 2g of VC, fully dissolved;

[0034] Step (3): Add 20g of activated carbon powder while stirring, stir for 30 minutes, then add 50g of CNTs, stir at high speed, and transfer the composite slurry to the sand mill equipment after the carbon material is fully infiltrated;

[0035] Step (4): Adjust the speed of the sand mill to 1000r / min, grind for 10 hours, and use a chiller to keep the temperature of the sand mill bin below 40 degrees.

[0036] The measured moisture content of the conductive paste is 2937ppm, the particle size test is 8μm, and the viscosity test is 10570 mPa•s.

[0037] Option II:

[0038] Step (1). First turn on the...

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PUM

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Abstract

The invention belongs to the field of lithium ion batteries, and relates to a carbon nano tube conductive agent sizing for a negative electrode material of a lithium ion battery and a preparation method thereof. The method is characterized in that activated carbon is added to the conductive agent sizing, so that the dispersity of carbon nano tubes is improved, and moreover, the adsorption capacityof a negative electrode of the lithium ion battery to electrolyte can be improved through the activated carbon dispersed in the negative electrode material, and as a result, the dispersing route of ions is reduced; a negative electrode filming agent is added to the conductive agent sizing, so that a surface SEI film can be formed on the negative electrode during charge and discharge.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, and relates to a conductive paste used for negative electrodes of lithium ion batteries. The conductive agent is mainly carbon nanotubes. Background technique [0002] Anode materials are an important factor affecting the energy density of lithium-ion batteries, and porosity is the most critical factor determining the performance of anode materials. Anode materials with large porosity can absorb more lithium ions, thereby increasing the energy density of lithium-ion batteries. In order to avoid the influence of concentration polarization, the electrode is required to have an optimal pore structure. In order to ensure the high-current discharge capability of the battery, the electronic conductivity and ionic conductivity of the electrode must be optimal, and low-resistance electrode materials are of great significance for the power density of lithium-ion batteries. [0003] The intrinsic cond...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M10/0525
CPCH01M4/625H01M10/0525Y02E60/10
Inventor 张永毅冯智富谢宇海吴茂玲方爱金张亦弛
Owner 南昌新苏纳米材料有限公司
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