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Preparation method for three-dimensional hierarchical porous biomass carbon negative electrode material of lithium ion battery

A lithium-ion battery, graded porous technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of complex preparation process and long time of biomass carbon, and achieve the effect of improving electrochemical performance.

Active Publication Date: 2016-11-09
SHAANXI UNIV OF SCI & TECH
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The preparation process of biomass carbon prepared by these methods is relatively complicated and takes a long time

Method used

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  • Preparation method for three-dimensional hierarchical porous biomass carbon negative electrode material of lithium ion battery

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Effect test

Embodiment 1

[0016] Embodiment 1: A preparation method of a three-dimensional hierarchical porous biomass carbon lithium ion battery negative electrode material,

[0017] Step 1: Wash and dry the fungus with deionized water, and grind the dried fungus through a 50-mesh nylon sieve to obtain fungus particles with uniform particle size;

[0018] Step 2: using 98% concentrated sulfuric acid to prepare sulfuric acid solution A with a mass fraction of 15%;

[0019] Step 3: Put 1g of fungus particles into 60ml of solution A, stir magnetically for 10 minutes, transfer to the reaction kettle and seal it, set the microwave hydrothermal reaction temperature to 120°C, react for 3 hours, and cool naturally to room temperature to obtain precursor B;

[0020] Step 4: Precursor B is centrifuged and washed with potassium hydroxide solution and deionized water, and then dried;

[0021] Step 5: Put 0.2g of the dried precursor B into 70ml of 0.1M potassium hydroxide solution, stir it magnetically for 12 hou...

Embodiment 2

[0024] Embodiment 2: a preparation method of a three-dimensional hierarchical porous biomass carbon lithium ion battery negative electrode material,

[0025] Step 1: Wash and dry the fungus with deionized water, and grind the dried fungus through a 50-mesh nylon sieve to obtain fungus particles with uniform particle size;

[0026] Step 2: using 98% concentrated sulfuric acid to prepare sulfuric acid solution A with a mass fraction of 20%;

[0027] Step 3: Put 2 g of fungus particles into 65 ml of solution A, stir magnetically for 15 minutes, transfer it into a reaction kettle and seal it, set the microwave hydrothermal reaction temperature to 140°C, react for 4 hours, and naturally cool to room temperature to obtain precursor B;

[0028] Step 4: Precursor B is centrifuged and washed with potassium hydroxide solution and deionized water, and then dried;

[0029] Step 5: Take 0.3g of dried precursor B and put it into 100ml of 0.15M potassium hydroxide solution, stir it magnetic...

Embodiment 3

[0032] Step 1: Wash and dry the fungus with deionized water, and grind the dried fungus through a 50-mesh nylon sieve to obtain fungus particles with uniform particle size;

[0033] Step 2: using 98% concentrated sulfuric acid to prepare sulfuric acid solution A with a mass fraction of 25%;

[0034] Step 3: Put 3 g of fungus particles into 70 ml of solution A, stir magnetically for 20 minutes, transfer to a reaction kettle and seal it, set the microwave hydrothermal reaction temperature to 160°C, react for 5 hours, and naturally cool to room temperature to obtain precursor B;

[0035] Step 4: Precursor B is centrifuged and washed with potassium hydroxide solution and deionized water, and then dried;

[0036] Step 5: Take 0.25g of dried precursor B and put it into 85ml of 0.2M potassium hydroxide solution, stir magnetically for 16h, then vacuum filter, wash with hydrochloric acid solution and deionized water, and dry to obtain activated precursor C ;

[0037] Step 6: Put the ...

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Abstract

The invention provides a preparation method for a three-dimensional hierarchical porous biomass carbon negative electrode material of a lithium ion battery. According to the invention, edible fungus is used as a raw material for biomass carbon and three-dimensional hierarchical porous biomass carbon is prepared through a combination of a microwave hydrothermal method and a heat treatment method; the three-dimensional hierarchical porous biomass carbon has good cycle stability and rate capability when used as the negative electrode material of the lithium ion battery; the edible fungus contains rich polysaccharides, so carbonization yield of biomass is high; a cell wall contains abundant chitin, so a stable carbon skeleton can be formed and enables the negative electrode material to have a stable structure and to be not prone to collapse during charging and discharging; and the pore size of the material can be controlled by controlling alkali concentration, so the electrochemical performance of the material is improved.

Description

technical field [0001] The invention belongs to the technical field of lithium ion battery negative electrode material preparation, and in particular relates to a preparation method of a three-dimensional hierarchical porous biomass carbon lithium ion battery negative electrode material. Background technique [0002] Due to the advantages of high voltage (4V), high energy density, small self-discharge, long cycle life, no pollution and no memory effect, lithium-ion batteries have been widely used in electrical equipment such as mobile phones, notebook computers, and small cameras. It also shows good application prospects and potential economic benefits in the fields of electric vehicles, satellites, aerospace and space military. At present, the negative electrode material of lithium-ion batteries for commercial application is graphite. Graphite has the advantages of low cost, good electrical conductivity, stable physical and chemical properties, and long cycle life. Shortco...

Claims

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Application Information

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IPC IPC(8): C01B31/02H01M4/587H01M10/0525
CPCC01P2004/03H01M4/587H01M10/0525Y02E60/10
Inventor 李嘉胤康倩曹丽云程娅伊齐慧欧阳海波许占位黄剑锋
Owner SHAANXI UNIV OF SCI & TECH
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