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A kind of preparation method of graphene-nano carbon fiber conductive agent

A technology of carbon nanofibers and a manufacturing method, which is applied in the field of electrochemical materials, can solve the problems of poor conductivity of lithium ion batteries, etc., and achieve the effects of good compatibility, improved conductivity, and reduced addition amount

Active Publication Date: 2021-03-23
ETRUST POWER ETP GRP LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Purpose of the invention: for the problems referred to above, the purpose of this invention is to provide a kind of preparation method of graphene-nano carbon fiber conductive agent, to solve the technical problem of the poor conductivity of lithium ion battery

Method used

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  • A kind of preparation method of graphene-nano carbon fiber conductive agent
  • A kind of preparation method of graphene-nano carbon fiber conductive agent
  • A kind of preparation method of graphene-nano carbon fiber conductive agent

Examples

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Effect test

Embodiment 1

[0020] A kind of preparation method of graphene-nano carbon fiber conductive agent, comprises the following steps:

[0021] 1) Oxidize the graphite into graphite oxide with an oxidant, and then ultrasonically peel the graphite oxide into graphene oxide;

[0022] Among them, the oxidizing agent is concentrated sulfuric acid, fuming nitric acid, potassium permanganate and hydrogen peroxide. The preparation process of graphite oxide is: stirring and dispersing graphite in concentrated sulfuric acid, adding fuming nitric acid after stirring for 20 minutes, controlling the temperature of the water bath to 20°C, and then slowly Add potassium permanganate, the rate of adding potassium permanganate is 3g / min, keep the reaction temperature at 25°C during the addition of potassium permanganate, continue stirring for 148h, add water, add hydrogen peroxide after heating to 92°C, and stir for 0.5h , and then wash with a ceramic membrane, adjust the pH to 7 after washing with water, and obt...

Embodiment 2

[0029] A kind of preparation method of graphene-nano carbon fiber conductive agent, comprises the following steps:

[0030] 1) Oxidize the graphite into graphite oxide with an oxidant, and then ultrasonically peel the graphite oxide into graphene oxide;

[0031] Among them, the oxidizing agent is concentrated sulfuric acid, fuming nitric acid, potassium permanganate and hydrogen peroxide. The preparation process of graphite oxide is: stirring and dispersing graphite in concentrated sulfuric acid, adding fuming nitric acid after stirring for 25 minutes, controlling the temperature of the water bath to 23 °C, and then slowly Add potassium permanganate, continue stirring for 149 hours, then add water, heat up to 93°C, add hydrogen peroxide, stir for 0.8 hours, then wash with a ceramic membrane, adjust the pH to 6.8 after washing with water, and obtain graphite oxide.

[0032] 2) Add 600 g of treated nano-carbon fibers to 10 g of graphene oxide, then add 10 g of phosphorus pentach...

Embodiment 3

[0037] A kind of preparation method of graphene-nano carbon fiber conductive agent, comprises the following steps:

[0038] 1) Oxidize the graphite into graphite oxide with an oxidant, and then ultrasonically peel the graphite oxide into graphene oxide;

[0039] Among them, the oxidizing agent is concentrated sulfuric acid, fuming nitric acid, potassium permanganate and hydrogen peroxide. The preparation process of graphite oxide is as follows: graphite is stirred and dispersed in concentrated sulfuric acid, and after stirring for 30 minutes, fuming nitric acid is added, and the temperature of the water bath is controlled at 25°C, and then slowly Add potassium permanganate, continue stirring for 150 hours, then add water, heat up to 95°C, add hydrogen peroxide, stir for 150 hours, then wash with a ceramic membrane, adjust the pH to 7.3 after washing with water, and obtain graphite oxide.

[0040] 2) Add 600 g of treated nano-carbon fibers to 20 g of graphene oxide, then add 20...

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Abstract

The invention discloses a preparation method of a graphene-carbon nanofiber conductive agent, which comprises the following steps: 1) ultrasonically stripping graphite oxide into graphene oxide; 2) adding treated nanometer carbon fibers into graphene oxide, adding phosphorus pentachloride and reducing agent, stirring to obtain a mixed solution; The preparation process of the treated carbon nanofibers is as follows: adding carbon nanofibers to N- methylpyrrolidone, carbon nanofibers can be obtained by high-speed dispersion and ultrasonic treatment. 3) filter that mixed liquid to obtain filter cake, and carrying out ultrasonic treatment on the filter cake to obtain graphene-carbon nanofiber conductive agent. The invention has the advantages that the treated nano carbon fiber is added, and the nano carbon fiber is pre-treated by N-methylpyrrolidone, carbon nanofibers can be dispersed completely, the compatibility between carbon nanofibers and graphene oxide is good, and a composite conductive agent is formed, which can improve the conductivity of the conductive agent.

Description

technical field [0001] The invention relates to the field of electrochemical materials, in particular to a method for preparing a graphene-nano carbon fiber conductive agent. Background technique [0002] At present, with the development of electric vehicles, lithium-ion batteries as power sources have also received extensive attention. In the production process of lithium-ion batteries, conductive agents need to be added. The conductive agent is to ensure that the electrode has good charge and discharge performance. When making the electrode, a certain amount of conductive agent is usually added to collect micro-current between the active material and between the active material and the current collector to reduce the electrode charge. The contact resistance accelerates the movement rate of electrons, and can also effectively increase the migration rate of lithium ions in the electrode material, thereby improving the charge and discharge efficiency of the electrode. Howev...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/62H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/624H01M4/625H01M10/0525Y02E60/10
Inventor 王宁飞周卫陈志奎
Owner ETRUST POWER ETP GRP LTD
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