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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  • 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 ther

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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

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Experimental program
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[0032] Example 1

[0033] 9 groups of tests were designed, compared to nanocarbon fibers and carbon nanotubes, different dispersant content, different viscosity content, different diameters of nanocarbon fibers, and experiment 9 was the control group test;

[0034] Test 1:

[0035] 100 g of PVPK30 was dissolved in 11875 g of NMP, and the dispersing line velocity was 4 m / s, and the dissolution time was 1.5 h, 12.5 g of anhydrous piperazine was added, and 12.5 g of hydroxide was added, and the dispersing line velocity was 4m / s, dissolution time. For 1.5 h, a regraduate carbon nanotube having a 375g diameter of 10 to 20 nm is added, and the carbon nanotube is 260m. 2 / g, length is 5 ~ 15μm (eg figure 1As shown), the dispersing line speed is 8 m / s, the viscosity of 14542 MPa · S, the zirconum-bead filler of the sand mill is 60%, the linear speed is 11m / s, the zircon bead size is 0.6 ~ 0.8 μm, grinding After the laser particle size gauge (Dandong Baxi BT900S) is tested to D50 ...

Example Embodiment

[0049] Example 2

[0050] Design 4 groups of trials, compared to different grinding time and different zircon filling, and the test results are shown in Table 3.

[0051] The test 10 is different from the test 1 is: the abrasive time of the second ground grinding of the test 10 is 0.5 h;

[0052] The test 11 and the test 1 are: Test 11 The second grinding time is 3 h;

[0053] The test 12 is different from the test 1: the trial 12 of the second ground-ground zircon filling is 55%;

[0054] The test 13 and the test 1 are: Test 13 The second grounded zircon bead filling is 75%.

[0055] Table 3 Example 2 Test Results of Tests 10 ~ 13

[0056]

[0057]

[0058] By comparative tests 10, 11, 1, test 12, 13, 1, found that with the increase of the grinding time, the maximum film volume electrical resistance is increased and increased; with the increase in the amount of zirconum beads, the maximum volume resistance is present. the trend of. In general, longer grinding times and larger...

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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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