Method for preparing high-conductivity slurry from doped graphene

A technology of conductive paste and graphene, which is applied to the manufacture of conductive materials, circuits, and electrodes dispersed in non-conductive inorganic materials, can solve problems such as poor electrical conductivity, achieve good processing performance, reduce coating thickness, and ensure safety good performance

Active Publication Date: 2014-01-08
深圳好电科技有限公司
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Problems solved by technology

[0004] The purpose of the present invention is to solve the technical deficiencies of the poor conductivity ...

Method used

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  • Method for preparing high-conductivity slurry from doped graphene
  • Method for preparing high-conductivity slurry from doped graphene
  • Method for preparing high-conductivity slurry from doped graphene

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Embodiment 1

[0023] Weigh 100g of conductive paste, 5g of graphene, 4g of dispersant (pvp), and 700g of deionized water. The total weight is 809g, and the initial calculated solid content is 4.69% for use. The described conductive paste is selected from the existing Henkel series conductive paste with a solid content of 29%. In the implementation process, the conductive paste of the Japanese Showa SDX series can also be selected, or one of the Henkel series and the Japanese Showa SDX series. A mixture of one or more conductive pastes.

[0024] That is, the mass ratios of conductive paste: graphene: dispersant: deionized water are: 100: 5: 4: 700, respectively.

[0025] The mixing steps are:

[0026] Firstly, pour 4g of dispersant (pvp) and 350g of deionized water into a vacuum mixer for mixing, first rotate at a revolution of 20±3r / min, and rotate at a slow speed of 400±20r / min until the dispersant is completely infiltrated. In deionized water, then evacuate to -0.1mpa, and stir rapidly ...

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Abstract

The invention discloses a method for preparing high-conductivity slurry from doped graphene, relates to the field of preparation methods of high-conductivity slurry and overcomes the technical defect of poor conductivity of the traditional mature conductive slurry. The method comprises the following steps: (1) weighing conductive slurry, graphene, a dispersing agent and deionized water according to the mass ratio of 100: (5-15): (3-5):700; (2) mixing the dispersing agent and 1/2 of deionized water, and stirring for 1h under a vacuumized condition; (3) adding the conductive slurry, and stirring for 30min under the vacuumized condition; (4) adding the graphene, and stirring for 2h under the vacuumized condition; and (5) adding the residual deionized water, stirring for 30min under the vacuumized condition, measuring the viscosity and solid content of the prepared slurry, and controlling the viscosity to be 100-500mpa.s and controlling the solid content to be 3-8%. The mature conductive slurry is diluted, and most of the original conductive agents are replaced with a small part of doped high-conductivity graphene, so that the preparation process of the slurry is simplified, and the slurry is high in conductivity, small in internal resistance, uniform in particle size distribution, easy to coat, low in cost and high in cost performance.

Description

technical field [0001] The invention relates to the field of a preparation method of a high-conductivity paste, in particular to a preparation method for preparing a high-conduction paste on the basis of a mature conductive paste. Background technique [0002] The study found that by reducing the internal resistance of the battery and improving the conductivity of the conductive matrix material, the rate discharge performance of the battery can be greatly improved, and in the case of high rate discharge, the battery heat rises steadily, causing less damage to the SEI film on the surface of the negative electrode of the battery. The safety performance of the battery, while improving the electron transfer of the matrix, reducing the polarization of the battery, and improving the cycle performance of the battery. Through experiments, we found that coating the base material with 1u~2u high-conductivity materials can reduce the internal resistance of the battery polarization, imp...

Claims

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Application Information

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IPC IPC(8): H01M4/139H01M10/0525H01M4/04
CPCY02E60/122H01B1/24H01M4/625Y02E60/10
Inventor 李涛曾立平罗明黄子欣袁志刚
Owner 深圳好电科技有限公司
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