A kind of graphene conductive agent and lithium ion battery thereof

A technology of graphene and conductive agent, which is applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as difficulty in graphene dispersion, and achieve the effects of strong electronic conductivity, increased capacity, and reduced battery internal resistance

Active Publication Date: 2018-04-13
东莞维科新能源有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this technical solution, the structure of graphene can be understood as a single layer of graphite, so it has extremely good electrical conductivity, and the movement speed of electrons reaches 1 / 300 of the speed of light. And the huge specific surface area has more prominent advantages compared to carbon nanotubes or carbon black as conductive agents; and nonylphenol polyoxyethylene ether and monoethanolamine are used to improve the dispersion uniformity of graphene in solvents , to solve the problem of difficulty in partially dispersing graphene;

Method used

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  • A kind of graphene conductive agent and lithium ion battery thereof
  • A kind of graphene conductive agent and lithium ion battery thereof

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Effect test

Embodiment 1

[0029] A graphene conductive agent, the mass parts of each component of the graphene conductive agent is: 120 parts of graphene, 30 parts of nonylphenol polyoxyethylene ether, 10 parts of monoethanolamine, 200 parts of solvent, 2 parts of auxiliary agent , 7 parts of conductive polymer agent, 2 parts of glass microspheres and 3 parts of iridium acetylacetonate.

[0030] The solvent is cyclohexanone.

[0031] The conductive polymer agent is polyacetylene.

[0032] The auxiliary agent is composed of the following raw materials in parts by weight: 5 parts of cellulose acetate, 10 parts of polyoxyethylene stearate, 5 parts of seaweed mud and 15 parts of silane coupling agent.

[0033] The preparation method of graphene conductive agent comprises the following steps:

[0034] 1) Add graphene to acetic acid first, raise the temperature to 90°C, stir for 3 hours, then wash and dry; mix graphene, nonylphenol polyoxyethylene ether and glass beads with half of the solvent, and ultraso...

Embodiment 2

[0038] A graphene conductive agent, the mass parts of each component of the graphene conductive agent is: 130 parts of graphene, 38 parts of nonylphenol polyoxyethylene ether, 17 parts of monoethanolamine, 260 parts of solvent, 3 parts of auxiliary agent , 8 parts of conductive polymer agent, 3 parts of glass microspheres and 5 parts of iridium acetylacetonate.

[0039] The solvent is ethanol.

[0040] The conductive polymer agent is polystyrene.

[0041] The auxiliary agent is composed of the following raw materials in parts by weight: 7 parts of cellulose acetate, 13 parts of polyoxyethylene stearate, 8 parts of seaweed mud and 18 parts of silane coupling agent.

[0042] The preparation method of graphene conductive agent comprises the following steps:

[0043] 1) Add graphene to acetic acid first, raise the temperature to 90°C, stir for 3 hours, then wash and dry; mix graphene, nonylphenol polyoxyethylene ether, glass beads and half of the solvent, and ultrasonicate at 60...

Embodiment 3

[0047] A graphene conductive agent, the mass parts of each component of the graphene conductive agent is: 150 parts of graphene, 45 parts of nonylphenol polyoxyethylene ether, 25 parts of monoethanolamine, 300 parts of solvent, 2-3 parts Additives, 10 parts of conductive polymer agent, 4 parts of glass microspheres and 8 parts of iridium acetylacetonate.

[0048] The solvent is cyclopentanone.

[0049] The conductive polymer agent is polyaniline.

[0050] The auxiliary agent is composed of the following raw materials in parts by weight: 10 parts of cellulose acetate, 15 parts of polyoxyethylene stearate, 10 parts of seaweed mud and 25 parts of silane coupling agent.

[0051] The preparation method of graphene conductive agent comprises the following steps:

[0052] 1) Add graphene to acetic acid first, raise the temperature to 90°C, stir for 3 hours, then wash and dry; mix graphene, nonylphenol polyoxyethylene ether and glass beads with half of the solvent, and ultrasonicate...

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Abstract

The invention relates to a graphene conductive agent. The graphene conductive agent is prepared from the following components in parts by weight: 120-150 parts of graphene, 30-45 parts of nonylphenoxypoly(ethyleneoxy)ethanol, 10-25 parts of monoethanolamine, 200-300 parts of solvent, 2-3 parts of additives, 7-10 parts of conductive polymer agent, 2-4 parts of glass beads and 3-8 parts of iridium acetylacetonate. According to the conductive agent, the graphene is taken as the master component, through utilization of the excellent electric conductivity of the graphene, the capacity of an electrode material is increased, the internal resistance of a battery is reduced, and the cycle life of the battery is prolonged. The 2C rate is improved by 6-10% when the lithium ion battery is prepared, the cost is reduced, and the lithium ion battery is highly competitive.

Description

technical field [0001] The invention relates to a lithium ion battery, in particular to a graphene conductive agent with reduced cost, improved electrical conductivity and cycle life and a lithium ion battery thereof. Background technique [0002] Lithium-ion batteries have the advantages of high specific energy and no memory effect. In recent years, they have been favored by people as a new energy source and have developed rapidly. With the maturity of technology, people's requirements for lithium-ion batteries are also getting higher and higher. [0003] Lithium-ion batteries in the prior art mainly use conductive graphite, acetylene black and carbon nanotubes as conductive agents. Acetylene black is a chain composed of spherical amorphous carbon particles. It is currently the most widely used conductive agent with low price. , but in order to achieve the purpose of enhancing the mutual contact between electrode active materials, the amount of addition required is large, r...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/62H01M10/0525
CPCH01M4/625H01M10/0525Y02E60/10
Inventor 曹长河刘旭汪泉
Owner 东莞维科新能源有限公司
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