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High-conductivity and high-stability carbon nanotube compound conductive paste for lithium ion battery and preparation method of high-conductivity and high-stability carbon nanotube compound conductive paste

A technology of lithium-ion batteries and carbon nanotubes, applied in the direction of conductive materials dispersed in non-conductive inorganic materials, battery electrodes, cables/conductors, etc., can solve the problems of easy rebound of the viscosity of carbon nanotube conductive paste, and achieve Reduce static electricity, improve performance and maintain stable effect

Pending Publication Date: 2021-06-25
河南克莱威纳米碳材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In order to maintain the conductive network under large magnification and long cycle, and solve the problem that the viscosity of carbon nanotube conductive paste is easy to rebound, the present invention provides a high conductivity and high stability carbon nanotube compound conductive paste for lithium ion batteries Material and preparation method thereof, the present invention utilizes the characteristics of both carbon nanotubes and carbon nanofibers to prepare slurry with stable viscosity, long storage time and excellent electrical conductivity, which is convenient for use in the homogenization process of lithium ion batteries, and is beneficial to the later lithium ion battery. Performance of ion batteries

Method used

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  • High-conductivity and high-stability carbon nanotube compound conductive paste for lithium ion battery and preparation method of high-conductivity and high-stability carbon nanotube compound conductive paste
  • High-conductivity and high-stability carbon nanotube compound conductive paste for lithium ion battery and preparation method of high-conductivity and high-stability carbon nanotube compound conductive paste
  • High-conductivity and high-stability carbon nanotube compound conductive paste for lithium ion battery and preparation method of high-conductivity and high-stability carbon nanotube compound conductive paste

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] 9 groups of experiments were designed to compare carbon nanofibers and carbon nanotubes with different addition ratios, different dispersant contents, different viscosity reducer contents, and nanocarbon fibers with different diameters, among which experiment 9 was a control group experiment;

[0034] Test 1:

[0035] Dissolve 100g of PVPK30 in 11875g of NMP, the dispersion linear velocity is 4m / s, the dissolution time is 1.5h, add 12.5g of anhydrous piperazine, add 12.5g of sodium hydroxide, the dispersion linear velocity is 4m / s, the dissolution time For 1.5h, 375g of agglomerated carbon nanotubes with a diameter of 10-20nm were added, and the specific surface of the carbon nanotubes was 260m 2 / g, the length is 5~15μm (such as figure 1shown), the dispersion linear velocity is 8m / s, the viscosity after dispersion is 14542mpa s, the zirconium bead filling amount of the sand mill is 60%, the linear velocity is 11m / s, the zirconium bead size is 0.6~0.8μm, and the grindi...

Embodiment 2

[0050] Four sets of experiments were designed to compare the effects of different grinding times and different filling amounts of zirconium beads. The test results are shown in Table 3.

[0051] The difference between Test 10 and Test 1 is that the grinding time of the second grinding in Test 10 is 0.5h;

[0052] The difference between Test 11 and Test 1 is that the second grinding time of Test 11 is 3 hours;

[0053] The difference between Test 12 and Test 1 is that the filling amount of zirconium beads in the second grinding of Test 12 is 55%;

[0054] The difference between Experiment 13 and Experiment 1 is that the filling amount of zirconium beads in the second grinding of Experiment 13 is 75%.

[0055] The test result of test 10~13 in the embodiment 2 of table 3

[0056]

[0057]

[0058] By comparing tests 10, 11, 1 and 12, 13, 1, it is found that as the grinding time increases, the volume resistance of the pole piece first decreases and then increases; as the f...

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Abstract

The invention relates to high-conductivity and high-stability carbon nanotube compound conductive paste for a lithium ion battery and a preparation method of the high-conductivity and high-stability carbon nanotube compound conductive paste. The conductive paste is composed of the following raw materials: a conductive agent, a dispersant, a viscosity reducer and a solvent, wherein the conductive agent is composed of carbon nanotubes and carbon nanofibers, the total solid content of the carbon nanotubes and the carbon nanofibers is 2-15%, the weight ratio of the conductive agent to the dispersing agent to the viscosity reducer to the solvent in the conductive paste is (2-15):(0.75-4):(0.02-0.2):(80.8-97.23), the diameter of the carbon nanotube is 2-50 nm, the length is 5-300 [mu]m, the specific surface area is 50-800 m<2> / g, the diameter of the carbon nanofibers is 50-200 nm, the length is 5-50 microns, and the specific surface area is 10-100 m<2> / g. By utilizing the characteristics of the carbon nanotubes and the carbon nanofibers, the prepared paste is stable in viscosity, long in storage time and excellent in conductivity, is convenient to use in the homogenizing process of the lithium ion battery, and is beneficial to exerting the performance of the lithium ion battery in the later period.

Description

technical field [0001] The invention relates to the technical field of conductive paste, in particular to a high-conductivity and high-stability carbon nanotube compound conductive paste for lithium ion batteries and a preparation method thereof. Background technique [0002] Conductive agent, as an auxiliary material for lithium-ion batteries, has the function of transporting ions and electrons in lithium-ion batteries, and is an important part of lithium-ion batteries; generally used conductive agents are nano-carbon fibers, conductive carbon black, carbon nanotubes, graphite ene etc. Conductive carbon black is a granular conductive agent, generally in a point-to-point contact mode. When used alone, it is added in a large amount and it is difficult to build a conductive network. Carbon nanofibers and carbon nanotubes are fiber conductive agents with less addition and excellent electrical conductivity. [0003] Carbon nanotubes generally have a diameter of less than 50nm ...

Claims

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Application Information

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IPC IPC(8): H01B1/18H01M4/62H01M10/0525H01B13/00
CPCH01B1/18H01M4/625H01M10/0525H01B13/00Y02E60/10
Inventor 聂艳艳吴晓杰顾朝阳袁帅锋王治伟尚培渊
Owner 河南克莱威纳米碳材料有限公司
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