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A kind of preparation method of carbon nanotube conductive paste, positive electrode material and lithium battery

A technology of carbon nanotubes and cathode materials, which is applied in the field of lithium-ion batteries, can solve problems such as inability to disperse carbon nanotubes, affect battery energy density, and reduce battery discharge capacity, so as to reduce battery volume, increase energy density, and increase capacity Effect

Active Publication Date: 2019-08-16
奇瑞新能源汽车股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the process of realizing the present invention, the inventors have found that there are at least the following problems in the prior art: due to the nanoscale size and large specific surface area of ​​carbon nanotubes, they are easy to aggregate into bundles and agglomerate in solution, and cannot Make carbon nanotubes well dispersed in the positive electrode material of the battery, increase the internal resistance of the battery, reduce the discharge capacity of the battery, and then affect the energy density of the battery

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Preparation of carbon nanotube conductive paste:

[0029] Step 1a) vacuum baking carbon nanotubes;

[0030] Powder pre-baking: bake the carbon nanotubes at 120°C and -0.08MPa vacuum for 2 hours, and finally turn off the temperature, keep the vacuum, cool down to 60°C and take it out.

[0031] Step 2a) mixing and stirring polyvinyl alcohol and N-methylpyrrolidone with the carbon nanotubes to obtain a carbon nanotube conductive paste.

[0032] Mixing: 1000.0g of carbon nanotubes, 280g of polyvinyl alcohol (dispersant) and 20g of N-methylpyrrolidone (NMP solvent) were mixed and stirred at a low speed for 30 minutes to obtain a stable conductive paste of carbon nanotubes.

[0033] In the above carbon nanotube conductive paste, the weight ratio of carbon nanotubes, polyvinyl alcohol and N-methylpyrrolidone is 100:28:2; and the solid content of N-methylpyrrolidone is 60%-80%. The carbon nanotubes are made into a slurry and introduced into the positive electrode material as ...

Embodiment 2

[0049] Preparation of carbon nanotube conductive paste:

[0050] Step 1a) vacuum baking carbon nanotubes;

[0051] Powder pre-baking: bake the carbon nanotubes at 120°C and -0.08MPa vacuum for 2 hours, and finally turn off the temperature, keep the vacuum, cool down to 60°C and take it out.

[0052] Step 2a) mixing and stirring polyvinyl alcohol and N-methylpyrrolidone with the carbon nanotubes to obtain a carbon nanotube conductive paste.

[0053] Mixing: 1000.0g of carbon nanotubes, 200g of polyvinyl alcohol (dispersant) and 20g of N-methylpyrrolidone (NMP solvent) were mixed and stirred at a low speed for 30 minutes to obtain a stable carbon nanoconductive paste.

[0054] In the above carbon nanotube conductive paste, the weight ratio of carbon nanotubes, polyvinyl alcohol and N-methylpyrrolidone is 100:20:2; and the solid content of N-methylpyrrolidone is 60%-80%. The carbon nanotubes are made into a slurry and introduced into the positive electrode material as a conduct...

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PUM

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Abstract

The invention discloses a preparation method of carbon nanotube conductive slurry and cathode material and a lithium battery, and belongs to the technical field of lithium ion battery. The carbon nanotubes used in the embodiment are uniform, and have a periodical tunnel structure. The carbon nanotubes are made into slurry, which serves as a conductive agent to be introduced in the cathode material, so that the carbon nanotubes can be better dispersed in the cathode material of a battery. In this way, the cycle performance of a battery, large power output and rapid charging performance are improved, and agglomeration caused by directly applying the carbon nanotubes on the cathode material can be prevented, During preparing a lithium battery, the compacted density is controlled through structure, the size of the battery is reduced, and the capacity of an electrical core is increased, and the energy density of the battery is increased.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a carbon nanotube conductive paste, a method for preparing positive electrode materials and a lithium battery. Background technique [0002] In 2017, the state will provide financial subsidies for new energy vehicles based on energy density, with the cruising range as a necessary indicator. The government encourages the use and promotion of advanced technologies such as high energy density and lightweight vehicles, and at the same time puts forward higher requirements for battery cost control. Combined with the technical requirements for energy batteries in subsidies, improving the energy density of batteries is a key issue that every electric vehicle company pays attention to. [0003] Ternary batteries with high energy density and good performance require higher gram capacity, better battery structure and better functional materials, so the cost will be higher. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01B1/24H01B13/00H01M4/62H01M4/131H01M10/0525
CPCH01B1/24H01B13/00H01M4/131H01M4/625H01M10/0525H01M2220/20Y02E60/10
Inventor 姚朝华韩友国杨玉梅余洁董光奇
Owner 奇瑞新能源汽车股份有限公司