Preparation method of hard carbon-based negative electrode material

A technology of negative electrode material and base material, which is applied in the field of preparation of hard carbon-based negative electrode material, can solve the problems of non-long-term sustainable operation, environmental pollution and large consumption of energy, large fluctuation of raw material prices, etc., to achieve high social and environmental Benefit, improve the charge-discharge cycle performance, improve the effect of reversible capacity and cycle performance

Active Publication Date: 2021-03-26
DONGGUAN KAIJIN NEW ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The preparation cost of the current practical mesocarbon microsphere material (MCMB) is relatively high
In terms of natural and artificial graphite, in order to reduce the initial irreversible capacitance and improve the cycle life, it is necessary to modify the surface with asphalt-like aromatic hydrocarbon compound materials. During the preparation process, carbonization needs to be carried out at a high temperature above 1300°C. Among them, the raw materials (pitch-like aromatic hydrocarbons Compounds) price fluctuations, as well as environmental pollution and massive energy consumption caused by high-temperature carbonization, are not the direction of long-term sustainable management

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A method for preparing a hard carbon-based negative electrode material, comprising the following preparation steps:

[0029] S1: Add the bottom glycerin residue into the high-speed stirrer, then add alcohol solvent, stir and heat to 120°C until it dissolves into a liquid to obtain a glycerin residue solution;

[0030] S2: Pass the glycerin residue solution through a 15 μm primary filter to remove insoluble impurities, then add dimethylamine, raise the temperature to 100°C, and then pass through a 20 μm secondary filter to remove insoluble impurities to obtain aminated glycerin residue solution ;

[0031] S3: Put the aminated glycerol slag solution in a high-temperature heating furnace, and conduct a carbonization treatment under the protection of nitrogen. The temperature of the first carbonization treatment is 400°C-600°C, and the time is 4h, and the carbonized glycerol slag is obtained ;

[0032] S4: Put the primary carbonized glycerol slag in a graphite mold, then ...

Embodiment 2

[0038] A method for preparing a hard carbon-based negative electrode material, comprising the following preparation steps:

[0039] S1: Add the bottom glycerin residue into the high-speed stirrer, then add alcohol solvent, stir and heat to 120°C until it dissolves into a liquid to obtain a glycerin residue solution;

[0040] S2: Pass the glycerin residue solution through a 15 μm primary filter to remove insoluble impurities, then add dimethylamine, raise the temperature to 120°C, and then pass through a 20 μm secondary filter to remove insoluble impurities to obtain the aminated glycerin residue solution ;

[0041]S3: Put the aminated glycerol slag solution in a high-temperature heating furnace, and conduct a carbonization treatment under the protection of nitrogen. The temperature of the first carbonization treatment is 400°C-600°C, and the time is 3h, and the carbonized glycerol slag is obtained ;

[0042] S4: Put the primary carbonized glycerin slag in a graphite mold, th...

Embodiment 3

[0048] A method for preparing a hard carbon-based negative electrode material, comprising the following preparation steps:

[0049] S1: Add the bottom glycerin residue into the high-speed stirrer, then add alcohol solvent, stir and heat to 120°C until it dissolves into a liquid to obtain a glycerin residue solution;

[0050] S2: Pass the glycerin residue solution through a 15 μm primary filter to remove insoluble impurities, then add dimethylamine, raise the temperature to 120°C, and then pass through a 20 μm secondary filter to remove insoluble impurities to obtain the aminated glycerin residue solution ;

[0051] S3: Put the aminated glycerol slag solution in a high-temperature heating furnace, and conduct a carbonization treatment under the protection of nitrogen. The temperature of the first carbonization treatment is 400°C-600°C, and the time is 3h, and the carbonized glycerol slag is obtained ;

[0052] S4: Put the primary carbonized glycerin slag in a graphite mold, t...

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Abstract

The invention discloses a preparation method of a hard carbon-based negative electrode material. The preparation method comprises the preparation steps of adding an alcohol solvent into bottom glycerol residues, stirring and heating to boil until the bottom glycerol residues are dissolved into liquid; adding dimethylamine into the glycerol residue solution; putting the aminated glycerol residue solution into a high-temperature heating furnace, and carrying out primary carbonization treatment; putting the glycerol residues subjected to primary carbonization into a plasma sintering furnace, vacuumizing, pressurizing, heating and sintering; putting the secondarily carbonized glycerol residues into an electric arc furnace, heating and sintering the secondarily carbonized glycerol residues under the protection of inert gas, and carrying out tertiary carbonization treatment; mixing the hard carbon-based material and a conductive agent, grinding, dispersing in absolute ethyl alcohol, adding an adhesive, uniformly stirring, drying and tabletting to obtain the hard carbon-based material negative electrode material. The bottom glycerol residues used in the method are rich in carbon resources, can be recycled, have very high social and environmental benefits, and has great significance for realizing green sustainable development.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a preparation method of a hard carbon-based negative 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] Lithium-ion batteries have the advantages of high operating voltage, high energy density, and good safety, and can be widely used in po...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/05H01M4/587H01M10/0525
CPCC01B32/05H01M4/587H01M10/0525H01M2004/027H01M2004/021Y02E60/10
Inventor 葛传长仰永军
Owner DONGGUAN KAIJIN NEW ENERGY TECH
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