Conductive paste, preparation method and application thereof, and battery

A conductive paste, paste technology, applied in conductive materials dispersed in non-conductive inorganic materials, battery electrodes, cable/conductor manufacturing, etc., can solve problems such as low conductivity, achieve high conductivity efficiency, easy dispersion, The effect of improving electrical conductivity

Inactive Publication Date: 2019-12-27
ENN GRAPHENE TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the anode materials of lithium-ion batteries are generally transition metal oxides or phosphates of transition metals, which have low conductivity and are generally semiconductors or insulators. In order to improve the conductivity of lithium-ion batteries, it is necessary to Add conductive paste
However, the use of existing conductive pastes is not enough to meet the needs of electric vehicle power batteries. Therefore, it is necessary to provide more high-quality conductive pastes to improve the overall performance of charging and discharging electrode materials, thereby improving the overall performance of battery charging and discharging.

Method used

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  • Conductive paste, preparation method and application thereof, and battery
  • Conductive paste, preparation method and application thereof, and battery
  • Conductive paste, preparation method and application thereof, and battery

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Experimental program
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preparation example Construction

[0032] During the preparation of the conductive paste, the number of layers of the modified graphene and the diameter, purity and specific surface area of ​​the carbon nanotubes will affect the conductivity of the obtained conductive paste.

[0033]For example: when the number of layers of the above-mentioned modified graphene is too thick, in the preparation process of the conductive paste, the modified graphene is prone to sedimentation, which affects the electrical conductivity of the conductive paste; when the number of layers of the above-mentioned modified graphene When it is too thin, the modified graphene is easy to float on the surface of the conductive paste during the preparation of the conductive paste and then agglomerates. Based on this, the number of layers of the above-mentioned modified graphene is 10-50 layers, so that the conductive paste obtained by combining the modified graphene, carbon nanotubes and conductive carbon black has high conductivity and high s...

Embodiment 1

[0087] The embodiment of the present invention provides a preparation method of conductive paste, the preparation method of the conductive paste comprises:

[0088] Step 1: Put polyvinylpyrrolidone and N-methylpyrrolidone in a dispersion tank, and disperse for 30 minutes at a speed of 600 r / min to obtain a mixed solution.

[0089] The second step: the expanded graphite and the mixed solution are placed in a high-pressure homogenizer, and homogenized at 200Mpa for 2 hours to obtain a graphene suspension.

[0090] The third step: filter the graphene suspension to obtain graphene.

[0091] Step 4: Soak graphene in concentrated sulfuric acid:concentrated nitric acid oxidizing solution with a molar ratio of 1:1 for 30 minutes, and filter to obtain graphene oxide.

[0092] Step 5: washing the graphene oxide with deionized water to remove the oxidizing solution on the surface of the graphene oxide, and then drying at 80° C. to obtain modified graphene, the number of layers of the mo...

Embodiment 2

[0101] The embodiment of the present invention provides a preparation method of conductive paste, the preparation method of the conductive paste comprises:

[0102] Step 1: Put polyethylene glycol and deionized water in a dispersion tank, and disperse for 20 minutes at a speed of 500 r / min to obtain a mixed solution.

[0103] The second step: the expandable graphite and the mixed solution are placed in a high-pressure homogenizer, and homogenized at 300Mpa for 2.5 hours to obtain a graphene suspension.

[0104] The third step: filter the graphene suspension to obtain graphene.

[0105] Step 4: Soak the graphene in concentrated sulfuric acid for 10 minutes, and filter to obtain graphene oxide.

[0106] Step 5: washing the graphene oxide with deionized water to remove the concentrated sulfuric acid on the surface of the graphene oxide, and then freeze-drying to obtain the modified graphene, the number of layers of the modified graphene is 15 layers.

[0107] Step 6: Stir and m...

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Abstract

The invention discloses conductive paste, a preparation method and application thereof and a battery, relates to the technical field of batteries, and aims to improve the comprehensive performance ofcharging and discharging of the battery. The conductive paste comprises modified graphene, carbon nanotubes, conductive carbon black, a dispersing agent and a solvent, wherein the modified graphene has oxygen-containing functional groups and defects. The preparation method of the conductive paste comprises the following steps: pretreating a graphite material to obtain modified graphene with oxygen-containing functional groups and defects; and uniformly mixing the modified graphene, carbon nanotubes, conductive carbon black, the dispersing agent and the solvent to obtain the conductive paste. The invention is used for the battery.

Description

technical field [0001] The invention relates to the field of battery technology, in particular to a conductive paste, a preparation method and application thereof, and a battery. Background technique [0002] With the increasingly prominent energy and environmental issues, the development of electric vehicles is imperative. Among them, lithium-ion batteries have high energy density and high specific power, and are recognized as the most potential electric vehicle power batteries. [0003] However, the anode materials of lithium-ion batteries are generally transition metal oxides or phosphates of transition metals, which have low conductivity and are generally semiconductors or insulators. In order to improve the conductivity of lithium-ion batteries, it is necessary to Add conductive paste. However, the use of existing conductive pastes is not enough to meet the needs of electric vehicle power batteries. Therefore, it is necessary to provide more high-quality conductive pa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01B1/24H01B13/00
CPCH01B1/24H01B13/00H01M4/625Y02E60/10
Inventor 马贺然马力王滨周建辉杨永旺
Owner ENN GRAPHENE TECH CO LTD
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