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Preparation method of composite microsphere lithium ion battery cathode material in yolk structure

A lithium-ion battery and composite microsphere technology, which is applied in the field of energy storage materials and lithium-ion batteries, can solve the problems of poor performance of negative electrode materials, restrictions on the use of negative electrode materials, aggregation and volume expansion, etc., and achieve novel structure and excellent electrical performance , The effect of stabilizing the yolk structure

Inactive Publication Date: 2016-05-11
QILU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But due to Fe 3 o 4 Its conductivity is low, and it is prone to coagulation and volume expansion during circulation. It has poor performance as an anode material, which limits its use as an anode material.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] (1) Dissolve 2.0g of ferric chloride·hexahydrate, 2.5g of anhydrous sodium acetate and 0.4g of sodium citrate in 50ml of ethylene glycol, and ultrasonically disperse for 1 hour to form a uniform suspension. The suspension was mechanically stirred at room temperature for 1 hour, and then put into a 100 ml reaction kettle to react at 180° C. for 10 hours. The precipitate was separated by a magnet, washed three times with absolute ethanol and water successively, and dried at 40°C for 8 hours to obtain Fe 3 o 4 Nanoparticles;

[0023] (2) Fe obtained from step (1) 3 o 4 0.2g, 100ml of ethanol and 6ml of ammonia water were mixed and stirred evenly. After stirring mechanically in a water bath at 25°C for 30 minutes, 3ml of tetraethyl orthosilicate was added dropwise, and mechanical stirring was continued for 10 hours. The solution slowly turned white. The precipitate was separated by a magnet, washed three times with absolute ethanol and water successively, and dried at 4...

Embodiment 2

[0029] (1) Dissolve 2.0g of ferric chloride·hexahydrate, 2.5g of anhydrous sodium acetate and 0.4g of sodium citrate in 50ml of ethylene glycol, and ultrasonically disperse for 1 hour to form a uniform suspension. The suspension was mechanically stirred at room temperature for 1 hour, then put into a 100 ml reaction kettle and reacted at 200° C. for 12 hours. The precipitate was separated by a magnet, washed three times with absolute ethanol and water successively, and dried at 40°C for 8 hours to obtain Fe 3 o 4 Nanoparticles;

[0030] (2) Fe obtained from step (1) 3 o 40.2g, 100ml of ethanol and 8ml of ammonia water were mixed and stirred evenly, and mechanically stirred in a water bath at 30°C for 30 minutes, then 4ml of ethyl orthosilicate was added dropwise, and mechanically stirred for 10 hours, the solution slowly turned white. The precipitate was separated by a magnet, washed three times with absolute ethanol and water successively, and dried at 40°C for 10 hours t...

Embodiment 3

[0036] (1) Dissolve 1.8g of ferric chloride·hexahydrate, 2.0g of anhydrous sodium acetate and 0.3g of sodium citrate in 40ml of ethylene glycol, and ultrasonically disperse for 1 hour to form a uniform suspension. The suspension was mechanically stirred at room temperature for 1 hour, then put into a 100 ml reaction kettle and reacted at 200° C. for 12 hours. The precipitate was separated by a magnet, washed three times with absolute ethanol and water successively, and dried at 40°C for 10 hours to obtain Fe 3 o 4 Nanoparticles;

[0037] (2) Fe obtained from step (1) 3 o 4 Mix and stir 0.15g of nanoparticles, 80ml of ethanol and 6ml of ammonia water evenly. After stirring mechanically in a water bath at 30°C for 30 minutes, add 3ml of ethyl orthosilicate dropwise and continue mechanically stirring for 10 hours. The solution slowly turns white. The precipitate was separated by a magnet, washed three times with absolute ethanol and water successively, and dried at 40°C for 1...

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Abstract

The invention discloses a preparation method of a composite microsphere lithium ion battery cathode material in a yolk structure. A nuclear layer of a composite microsphere is made of Fe3O4, a shell layer comprises a layer C and a layer N, a cavity is formed through etching between the nuclear layer and the shell layer, and the cavity is in a yolk structure. The preparation method of the composite microsphere comprises the following steps: firstly, compounding Fe3O4 nano particles by a hydrothermal method; then, coating a layer of SiO2 outside Fe3O4 by a sol-gel method; coating a layer of melamine resin polymer outside SiO2, and roasting in argon protection, so as to obtain an N-doped carbon encapsulated material; and finally, etching the layer of SiO2, so as to obtain the Fe3O4 composite microsphere lithium ion battery cathode material which is coated with N-doped carbon and is in the yolk structure. According to the preparation method, the material structure is novel, the operation is simple, and the material used in a lithium ion battery cathode has good electrochemical performance.

Description

technical field [0001] The invention belongs to the technical field of energy storage materials and lithium ion batteries, and in particular relates to a preparation method of a composite microsphere lithium ion battery negative electrode material with egg yolk structure. Background technique [0002] Lithium-ion batteries have been widely used in space power supplies, electronic products, and national defense industries due to their significant advantages such as long service life, high energy density, and stable working voltage. At present, the widely used negative electrode material of lithium-ion batteries is graphite, which has stable charge-discharge cycle performance and a theoretical specific capacity of 372mAhg. ?1 , but it has been difficult to meet new market demands. In recent years, due to the nanoscale transition metal oxides (M x o y , M=Mn, Fe, Co, Ni, etc.) has a high theoretical specific capacity, and has gradually gained the attention of energy material...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B82Y30/00H01M4/48H01M4/52H01M4/583H01M4/62H01M10/0525
CPCB82Y30/00H01M4/48H01M4/52H01M4/583H01M4/625H01M10/0525Y02E60/10
Inventor 刘伟良杨婷婷赵丹杨铭志任慢慢
Owner QILU UNIV OF TECH
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