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Graphite electrode composite material doped with carbon nano material

A technology of carbon nanomaterials and composite materials, applied in the field of graphite electrode composite materials, can solve the problems of low vibration and compaction density of graphene, battery polarization, etc., and achieve good dynamic behavior, good thermal conductivity and flexibility, Effect of High Aspect Ratio

Pending Publication Date: 2020-12-29
河南英能新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the main factors affecting the performance of batteries or supercapacitors are electrical conductivity, ionic conductivity and thermal conductivity. At present, the main function of graphene in batteries is to improve the thermal conductivity / heat dissipation characteristics of electrodes, and it is not an active material for the positive and negative electrodes of batteries. Because the sheet structure of graphene inhibits the diffusion of lithium ions, it is easy to cause serious polarization of the battery, which will cause the vibration and compaction density of graphene to be very low. Therefore, how to use graphene and other materials to improve the battery or supercapacitor The performance of the battery is still the direction of research in the field of batteries

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] A graphite electrode composite material doped with carbon nanomaterials, the composite material includes graphite, carbon nanohorns, carbon nanotubes and graphene nanosheets, graphite constitutes the main body of the composite material, carbon nanohorns, carbon nanotubes and Graphene nanosheets are filled into the material gap of the main body composed of graphite to form a three-dimensional bridging structure; specifically, the graphene nanosheets are reduced graphene oxide nanosheets with a size of 0.5-5 μm and a thickness of 0.7-0.9 nm. The carbon nanotubes adopt carboxylated carbon nanotubes with a length of 0.5-2 μm, and the carbon nanohorns mostly exist in the form of carbon nanohorn aggregates, and the particle diameter of the carbon nanohorn aggregates is 30-80 nm. Graphene nanosheets, The weight ratio of carbon nanotubes, carbon nanohorns and graphite is 0.3:0.3:0.3:96.

[0024] Further, the graphene nanosheets can also be pure graphene or reduced graphene oxid...

Embodiment 2

[0029] This embodiment is another implementation based on the embodiment 1, the description of the same technical solutions as the embodiment 1 will be omitted, and only the technical solutions different from the embodiment 1 will be described.

[0030] A graphite electrode composite material doped with carbon nanomaterials, the composite material includes graphite, carbon nanohorns, carbon nanotubes and graphene nanosheets, graphite constitutes the main body of the composite material, carbon nanohorns, carbon nanotubes and Graphene nanosheets are filled into the material gap of the main body composed of graphite to build a three-dimensional bridging structure; specifically, the weight ratio of graphene nanosheets, carbon nanotubes, carbon nanohorns and graphite is 2:2:2:88.

[0031] The graphite electrode composite material doped with carbon nanomaterials in this embodiment is prepared by the following preparation process: including,

[0032] Step 1: weighing graphene nanoshe...

Embodiment 3

[0035] This embodiment is another implementation based on the embodiment 1. The description of the same technical solutions as the embodiment 1 will be omitted, and only the technical solutions different from the embodiment 1 will be described.

[0036] A graphite electrode composite material doped with carbon nanomaterials, the composite material includes graphite, carbon nanohorns, carbon nanotubes and graphene nanosheets, graphite constitutes the main body of the composite material, carbon nanohorns, carbon nanotubes and Graphene nanosheets are filled into the material gap of the main body composed of graphite to build a three-dimensional bridging structure; specifically, the weight ratio of graphene nanosheets, carbon nanotubes, carbon nanohorns and graphite is 1:1:1:90.

[0037] The graphite electrode composite material doped with carbon nanomaterials in this embodiment is prepared by the following preparation process: including,

[0038] Step 1: weighing graphene nanoshe...

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Abstract

The invention belongs to the technical field of lithium batteries, and particularly relates to a graphite electrode composite material doped with a carbon nano material. The composite material comprises graphite, carbon nanohorns, carbon nanotubes and graphene nanosheets. The graphite forms a main body of the composite material. Material gaps of a main body formed by graphite are filled with the carbon nanohorns, the carbon nanotubes and the graphene nanosheets to construct a three-dimensional bridging structure. The graphene, the carbon nanotubes and the carbon nanohorns are jointly filled ingaps of the graphite particles, meanwhile, an effect of improving electrical conductivity, ionic conductivity and thermal conductivity of the composite material is achieved, due to a fact that the thermal conductivity is increased, the safety of the battery is improved, and the electrical conductivity is increased so that rapid charging is achieved; and the improvement of the ionic conductivity enhances the energy density, and can reduce structural collapse of a negative electrode material due to charge-discharge cycle so as to prolong the cycle life of the battery and prolong the service life of the battery.

Description

technical field [0001] The invention belongs to the technical field of lithium batteries, and in particular relates to a graphite electrode composite material doped with carbon nanomaterials. Background technique [0002] Lithium-ion batteries have a wide range of applications due to their advantages such as high specific energy, wide application temperature range, low self-discharge rate, long cycle life, and environmental friendliness. The negative electrode material of traditional lithium-ion batteries is graphite, but its practical application is greatly limited due to its low theoretical specific capacity and limited rate capability. [0003] Carbon-based materials represented by graphene have been successfully applied to the electrodes of secondary battery materials due to their large spatial structure and excellent photoelectric properties, which have improved the various properties of secondary battery materials to a certain extent. At present, the main factors affe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/583H01M10/0525H01G11/32H01G11/36
CPCH01M4/362H01M4/583H01M10/0525H01G11/32H01G11/36H01M2004/027Y02E60/10
Inventor 王浩兰
Owner 河南英能新材料科技有限公司