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Preparation method of porous electrode

A porous electrode and purpose technology, applied in the preparation/purification of carbon, battery electrodes, circuits, etc., can solve the problems of cumbersome cleaning and drying steps, and achieve the effect of improving chemical activity, easy control, and high electrochemical capacity

Inactive Publication Date: 2018-07-03
QINGDAO XIANGZHI ELECTRONICS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, solution methods generally require subsequent tedious washing and drying steps to remove liquid oxidants and moisture

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Dry the tea leaves, pulverize and sieve to obtain a solid substance, add the silicon powder with a mass ratio of 1:0.2 to the above solid substance, add a solvent and ball mill for 2 hours, and sieve out a 100-mesh slurry; the silicon powder is the average particle size 1.5μm micron silicon powder. The solvent is deionized water.

[0019] The slurry was spray-dried at an inlet air temperature of 200°C, an outlet air temperature of 90°C, and a rotation speed of 10 rpm; the silicon / carbon precursor of 300 mesh was sieved, heated to 400°C at a rate of 5 / min, kept for 4 hours, and pyrolyzed. Cool down to 300°C at a rate of 5°C / min, and cool down to room temperature with the furnace to obtain a silicon / carbon composite.

[0020] The graphite is placed in an atmosphere containing oxygen, and the graphite is subjected to high-temperature oxidation treatment; the surface-treated graphite is obtained by controlling the oxygen concentration, reaction temperature, and reaction ti...

Embodiment 2

[0023] Dry the tea leaves, pulverize and sieve to obtain a solid substance, add the silicon powder with a mass ratio of 1:0.5 to the above solid substance, add a solvent and ball mill for 10 hours, and sieve out a 100-mesh slurry; the silicon powder is the average particle size 1.5μm micron silicon powder. The solvent is deionized water or absolute ethanol.

[0024] The slurry is spray-dried at an inlet air temperature of 350°C, an outlet air temperature of 180°C, and a rotation speed of 50rpm; the silicon / carbon precursor of 300 meshes is sieved, heated to 1000°C at a rate of 5 / min, kept for 12 hours, and pyrolyzed. Cool down to 300°C at a rate of 5°C / min, and cool down to room temperature with the furnace to obtain a silicon / carbon composite;

[0025] The graphite is placed in an atmosphere containing oxygen, and the graphite is subjected to high-temperature oxidation treatment; the surface-treated graphite is obtained by controlling the oxygen concentration, reaction tempe...

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Abstract

The invention relates to a preparation method of a porous electrode. The method comprises the following steps: carbonizing tea leaf slag at a high temperature to be converted into nitrogen-doped hardcarbon; and compounding the hard carbon with graphene, wherein the specific surface of the graphene is reduced to a certain extent. The graphene surface treatment method provided by the invention canbe used for enhancing the chemical activity of the surface of graphite and enhancing the nucleation probability and the capacity of a material on the surface of the graphite in an electrochemical reaction. The porous electrode prepared by employing the method has relatively good conductivity and cycling stability, and has relatively high specific capacity and relatively long service life.

Description

technical field [0001] The invention relates to a preparation method of a porous electrode. Background technique [0002] In recent years, graphite has been widely used as an anode material in commercial lithium-ion batteries due to its low price, environmental friendliness, and stable electrochemical performance. [0003] The crystal structure of graphite is hexagonal layered. Each carbon atom in the same layer forms a covalent bond with sp2 hybridization with the surrounding 3 carbon atoms. The binding ability is very strong, and the layer contains a large number of free electrons; They are bound by relatively weak van der Waals forces. The surface of graphite, the plane parallel to the graphite layer is the basal plane, and the edge where the basal plane terminates is called the edge plane. The special crystal structure of graphite leads to the huge difference in the physical and chemical properties of its different surfaces, especially the electrochemical properties. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/587H01M4/1393H01M10/0525C01B32/05
CPCC01P2004/80H01M4/1393H01M4/587H01M10/0525Y02E60/10
Inventor 不公告发明人
Owner QINGDAO XIANGZHI ELECTRONICS TECH CO LTD
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