Preparation method of modified graphite electrode material

A graphite electrode and modification technology, applied in the direction of active material electrode, negative electrode, battery electrode, etc., can solve the problems of precipitation of sulfur particles, uneven distribution of sulfur, improvement and other problems, and achieve the effect of good charge-discharge performance and cycle performance.

Active Publication Date: 2021-04-02
DONGGUAN KAIJIN NEW ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the traditional technology, due to the high sulfur content and the uneven distribution of sulfur, there will be sulfur particles precipitated during the charging and discharging process, which is not conducive to the improvement of the energy density of the battery.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A preparation method of a modified graphite electrode material, comprising the following preparation steps:

[0025] S1: Add a nitric acid solution with a mass concentration of 1% to the graphite, adjust the pH to 4-6, then add a cationic polymer, and stir the reaction in a constant temperature water bath at 100°C-120°C to obtain the first reactant;

[0026] S2: Pass ionic liquid and carbon oxysulfide into the first reactant in sequence, and react at 100°C-150°C for 0.5h-2h to obtain the second reactant;

[0027] S3: Wash the second reactant with deionized water, then put it into a drying oven at 220°C-300°C for curing treatment for 10h-15h, and then use a ball mill for 2h-3h, so that the particle size of the powder after ball milling is less than 2μm , and then, under the protection of nitrogen, place the ball-milled powder in a high-temperature heating furnace for carbonization treatment. The temperature of carbonization treatment is 600°C-800°C, the pressure is 30MPa...

Embodiment 2

[0032] A preparation method of a modified graphite electrode material, comprising the following preparation steps:

[0033] S1: Add a nitric acid solution with a mass concentration of 1% to the graphite, adjust the pH to 4-6, then add a cationic polymer, and stir the reaction in a constant temperature water bath at 100°C-120°C to obtain the first reactant;

[0034] S2: Pass ionic liquid and carbon oxysulfide into the first reactant in sequence, and react at 100°C-150°C for 0.5h-2h to obtain the second reactant;

[0035] S3: Wash the second reactant with deionized water, then put it into a drying oven at 220°C-300°C for curing treatment for 10h-15h, and then use a ball mill for 2h-3h, so that the particle size of the powder after ball milling is less than 2μm , and then, under the protection of nitrogen, place the ball-milled powder in a high-temperature heating furnace for carbonization treatment. The temperature of carbonization treatment is 600°C-800°C, the pressure is 30MPa...

Embodiment 3

[0040] A preparation method of a modified graphite electrode material, comprising the following preparation steps:

[0041] S1: Add a nitric acid solution with a mass concentration of 1% to the graphite, adjust the pH to 4-6, then add a cationic polymer, and stir the reaction in a constant temperature water bath at 100°C-120°C to obtain the first reactant;

[0042] S2: Pass ionic liquid and carbon oxysulfide into the first reactant in sequence, and react at 100°C-150°C for 0.5h-2h to obtain the second reactant;

[0043] S3: Wash the second reactant with deionized water, then put it into a drying oven at 220°C-300°C for curing treatment for 10h-15h, and then use a ball mill for 2h-3h, so that the particle size of the powder after ball milling is less than 2μm , and then, under the protection of nitrogen, place the ball-milled powder in a high-temperature heating furnace for carbonization treatment. The temperature of carbonization treatment is 600°C-800°C, the pressure is 30MPa...

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PUM

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Abstract

The invention discloses a preparation method of a modified graphite electrode material. The method comprises the following steps: adding a nitric acid solution into graphite, adding a cationic polymer, and carrying out constant-temperature water bath stirring reaction to obtain a first reactant; sequentially introducing ionic liquid and carbon oxysulfide into the first reactant to obtain a secondreactant; washing the second reactant with deionized water, then putting the second reactant into a drying box for curing treatment, then carrying out ball milling with a ball mill, then putting the ball-milled powder into a high-temperature heating furnace, and carrying out carbonization treatment to obtain a third reactant; mixing the third reactant and a conductive agent, performing grinding, performing dispersing in absolute ethyl alcohol, adding an adhesive and potassium oxalate, uniformly performing stirring, drying and tabletting to obtain the modified graphite electrode material. The obtained modified graphite electrode material has good charging and discharging performance and cycle performance.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a preparation method of a modified graphite electrode material. Background technique [0002] With the increasing use of global energy, non-renewable energy sources such as fossil fuels are becoming increasingly exhausted, and will cause serious pollution to the environment. However, these new energies have problems such as intermittent supply and difficult control. Before using these new energies, the problem that needs to be solved is to store them and then release and utilize them centrally. Therefore, it is necessary to build a large-scale energy storage system. Electrochemical energy storage has high energy efficiency, controllable replay time, and good cycle performance, and has become a hot spot in new energy research. [0003] Carbon materials, especially heteroatom-doped carbon materials, have the characteristics of high specific surface area, high electrical conducti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/587H01M10/0525
CPCH01M4/366H01M4/5815H01M4/587H01M10/0525H01M2004/027H01M2004/021Y02E60/10
Inventor 彭飞仰永军
Owner DONGGUAN KAIJIN NEW ENERGY TECH
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