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A kind of novel lithium-ion battery negative electrode material and preparation method thereof

A technology for lithium-ion batteries and negative electrode materials, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as poor specific capacity and cycle stability, electrode material crushing, etc., and achieve improved electrochemical performance, enhanced conductivity, high The effect of specific capacity

Active Publication Date: 2020-11-27
INT ACAD OF OPTOELECTRONICS AT ZHAOQING SOUTH CHINA NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The invention overcomes the disadvantages of poor charge-discharge specific capacity and cycle stability and crushing of the electrode material of the negative electrode material of the lithium ion battery prepared in the prior art

Method used

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  • A kind of novel lithium-ion battery negative electrode material and preparation method thereof
  • A kind of novel lithium-ion battery negative electrode material and preparation method thereof
  • A kind of novel lithium-ion battery negative electrode material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0023] The negative electrode material of the lithium ion battery is a composite of sulfided ZIF8 and graphene.

[0024] The mass ratio of ZIF8 and graphene after the sulfidation is 2:1.

[0025] The preparation method of described lithium-ion battery negative electrode material, comprises the following steps:

[0026] (1) Preparation of ZIF8: a. Preparation of liquid A: disperse 5 mmol of zinc nitrate hexahydrate in 125 ml of methanol; preparation of liquid B: disperse 20 mmol of 2-methylimidazole in 125 ml of methanol;

[0027] b. When liquid A is under magnetic stirring conditions, pour liquid B into liquid A and stir for 3 minutes until uniform;

[0028] c. Seal and age the uniformly mixed A and B mixtures for 24 hours;

[0029] d. Centrifugal washing after aging, 3 times with methanol and 3 times with ethanol; after washing, dry at 60°C for 12 hours to obtain ZIF8;

[0030] (2) Preparation of ZnS hollow MOF material: 2g of ZIF8 prepared in step (1) and 1g of pure sulfu...

Embodiment 2

[0036] The preparation method of described lithium-ion battery negative electrode material, comprises the following steps:

[0037] (1) Preparation of ZIF8: a. Preparation of liquid A: disperse 10 mmol of zinc nitrate hexahydrate in 250 ml of methanol; preparation of liquid B: disperse 40 mmol of 2-methylimidazole in 250 ml of methanol;

[0038] b. When liquid A is under magnetic stirring conditions, pour liquid B into liquid A and stir for 5 minutes until uniform;

[0039] c. Seal and age the uniformly mixed A and B mixtures for 24 hours;

[0040] d. Centrifugal washing after aging, 3 times with methanol and 3 times with ethanol; after washing, dry at 80°C for 12 hours to obtain ZIF8;

[0041](2) Preparation of ZnS hollow MOF material: 4 g of ZIF8 prepared in step (1) and 2 g of pure sulfur were mixed, ground and sealed in

[0042] in a glass tube; then heated at 350 °C for 20 hours and cooled to room temperature naturally to prepare ZnS nanoparticle-embedded

[0043] Poro...

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Abstract

The invention belongs to the technical field of lithium ion batteries, and in particular relates to a novel lithium ion battery negative electrode material and a preparation method thereof. The material is a composite of vulcanized ZIF8 and graphene. The preparation method of the novel lithium ion battery negative electrode material comprises the following steps: (1) preparing ZIF8; (2) preparing ZnS hollow MOF material; (3) preparing ZnS hollow MOF material composite graphene. The invention overcomes the defects of poor charge-discharge specific capacity and cycle stability and crushing of the electrode material of the negative electrode material of the lithium ion battery prepared in the prior art.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a novel lithium ion battery negative electrode material and a preparation method thereof. Background technique [0002] In recent decades, Li-ion batteries have played an increasingly important role in portable electronic devices because of their long service life, high energy density, high reversible capacity, and environmental friendliness. As a conventional anode material in lithium-ion batteries, graphite materials are widely used due to their good electrochemical properties and structural stability during charge-discharge cycles, however, traditional graphitic carbon materials are due to their low theoretical capacity (372 mAh / g ) and seriously hinder the development of lithium-ion batteries. In order to meet the needs of energy storage, it is necessary to develop new anode materials to replace carbon materials. Metal sulfides such as CuS, MoS 2 ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/60H01M4/62H01M10/0525
CPCY02E60/10
Inventor 钊妍张俊凡
Owner INT ACAD OF OPTOELECTRONICS AT ZHAOQING SOUTH CHINA NORMAL UNIV
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