Method for preparing high-capacity high-rate nitrogen-doped graphene negative electrode material

A technology of nitrogen-doped graphene and negative electrode materials, applied in battery electrodes, electrical components, electrochemical generators, etc., can solve the problems of low specific capacity, restricting the performance of lithium-ion batteries, and poor rate performance, so as to improve electronic conductivity performance, excellent cycle stability, and capacity-enhancing effect

Inactive Publication Date: 2019-05-31
SHANDONG XINGHUO SCI TECH INSTITYTE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, graphitic carbon is commercially used as the anode material of lithium-ion batteries, but the disadvantages of graphite carbon, such as low specific capacity and poor rate pe

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] (1) Preparation of graphene oxide: mix natural graphite with concentrated sulfuric acid and phosphoric acid, slowly add potassium permanganate in a constant temperature water bath at 20°C, react for 2 hours, then add deionized water and raise the temperature of the water bath to 80°C , reacted for 20 minutes, then added hydrogen peroxide with a mass fraction concentration of 30%, finally washed with hydrochloric acid and deionized water until the pH of the solution was neutral, and freeze-dried to obtain graphene oxide; natural graphite, concentrated sulfuric acid, phosphoric acid, permanganate The mass ratio of potassium, deionized water, and 30% hydrogen peroxide is 2:80:80:1:150:1;

[0016] (2) Graphene oxide is added into deionized water, and ultrasonically dispersed for 30 minutes to obtain a graphene oxide suspension; the mass ratio of graphene oxide to deionized water is 2:40;

[0017] (3) Add cetyltrimethylammonium bromide and ammonium persulfate to the graphene...

Embodiment 2

[0020] (1) Preparation of graphene oxide: Mix natural graphite with concentrated sulfuric acid and phosphoric acid, slowly add potassium permanganate in a constant temperature water bath at 50°C, react for 5 hours, then add deionized water and raise the temperature of the water bath to 120°C , reacted for 60 minutes, then added hydrogen peroxide with a mass fraction concentration of 30%, finally washed with hydrochloric acid and deionized water until the pH of the solution was neutral, and freeze-dried to obtain graphene oxide; natural graphite, concentrated sulfuric acid, phosphoric acid, permanganate The mass ratio of potassium, deionized water, and 30% hydrogen peroxide is 8:180:200:5:400:5;

[0021] (2) Graphene oxide is added into deionized water, and ultrasonically dispersed for 50 minutes to obtain a graphene oxide suspension; the mass ratio of graphene oxide to deionized water is 5:80;

[0022] (3) Add cetyltrimethylammonium bromide and ammonium persulfate to the graph...

Embodiment 3

[0025] (1) Preparation of graphene oxide: Mix natural graphite with concentrated sulfuric acid and phosphoric acid, slowly add potassium permanganate in a constant temperature water bath at 30°C, react for 3 hours, then add deionized water and raise the temperature of the water bath to 95°C , reacted for 35min, then added hydrogen peroxide with a mass fraction concentration of 30%, and finally washed with hydrochloric acid and deionized water until the pH of the solution was neutral, freeze-dried to obtain graphene oxide; natural graphite, concentrated sulfuric acid, phosphoric acid, permanganate The mass ratio of potassium, deionized water, and 30% hydrogen peroxide is 4:110:130:2:210:3;

[0026] (2) Graphene oxide is added to deionized water, and ultrasonically divided to 37 to obtain a graphene oxide suspension; the mass ratio of graphene oxide to deionized water is 3:55;

[0027] (3) Add cetyltrimethylammonium bromide and ammonium persulfate to the graphene oxide suspensio...

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Abstract

The invention provides a method for preparing a high-capacity high-rate nitrogen-doped graphene negative electrode material, comprising the following steps of (1) preparing graphene oxide; (2) preparating a graphene oxide suspension; (3) preparing nitrogen-doped porous graphene; and (4) adding the nitrogen-doped porous graphene to a potassium permanganate solution, stirring the mixed solution for30 to 60 minutes, transferring the mixed solution to a reaction vessel to react at 180 degrees centigrade for 30 to 60 minutes, cooling the solution to room temperature, centrifuging the solution andwashing the solution with deionized water and ethanol, and vacuum drying the obtained black product at 80 degrees centigrade for 6 hours to obtain a high-capacity high-rate nitrogen-doped graphene negative electrode material. The method for preparing the high-capacity high-rate nitrogen-doped graphene negative electrode material improves the capacity of the electrode material, and has superior rate performance and cycle stability.

Description

technical field [0001] The invention belongs to the technical field of batteries, and in particular relates to a method for preparing a high-capacity and high-rate nitrogen-doped graphene negative electrode material. Background technique [0002] Lithium-ion batteries have been widely used in the field of portable electronic devices due to their superior performance. However, with the in-depth development of electronic products, especially the continuous emergence of new tools such as electric vehicles and hybrid vehicles, new requirements are placed on power supplies. This makes lithium-ion batteries face new challenges, and it is particularly urgent to develop new high-performance lithium-ion batteries. Anode materials are an important part of lithium-ion batteries, and their structure and properties have a decisive impact on the performance of lithium-ion batteries. At present, graphitic carbon is commercially used as the anode material of lithium-ion batteries, but the...

Claims

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Application Information

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IPC IPC(8): H01M4/583H01M10/0525
CPCY02E60/10
Inventor 车春玲
Owner SHANDONG XINGHUO SCI TECH INSTITYTE
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