A kind of negative electrode composite material and its preparation method and application

A composite material and negative electrode technology, applied in the application field of lithium ion batteries, can solve the problems of insufficient rate performance, poor electrode cycle stability, high raw material prices, etc., and achieve good cycle stability, low raw material cost, and electrochemical performance. improved effect

Active Publication Date: 2019-02-12
王俐
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the preparation process of electrode materials in the prior art is complicated, the price of raw materials is high, and the electrode cycle stability is poor, the rate performance is not good enough, and the environmental protection is poor

Method used

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  • A kind of negative electrode composite material and its preparation method and application
  • A kind of negative electrode composite material and its preparation method and application
  • A kind of negative electrode composite material and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The 100nm Si powder was sintered in a muffle furnace at a high temperature of 500°C for 1h. Take 0.12g of sintered silicon powder and disperse it in 20mL of deionized water and ultrasonically uniformly, then disperse 0.2g of P123 and 1g of pea flour in it, stir evenly at room temperature, then heat to paste, put it in the refrigerator and freeze for 6h. Then, freeze-drying and sintering with Ar gas at 600 degrees for 3 hours to prepare the target composite electrode material.

[0033] The ground composite material is fully ground and used as the negative electrode material of the lithium ion electrode, mixed with carbon black and carboxymethyl cellulose in a ratio of 70:15:15 parts by weight, and the film is dried in vacuum at 70°C for 6 hours to prepare A composite electrode for a lithium ion battery is obtained. The composite electrode was placed in the 2025 battery case, the lithium sheet was used as the counter electrode, the polyethylene film was used as the diaphrag...

Embodiment 2

[0036] The 100nm Si powder was sintered in a muffle furnace at a high temperature of 500°C for 1h. Take 0.01g of graphene oxide and disperse it in 40mL of deionized water, and then disperse 0.02g of sintered silicon powder in the above mixed solution. After sonication, disperse 0.4g of F127 and 1g of pea flour in it, stir well at room temperature, and then Heat to a paste, put in the refrigerator and freeze for 6h. Then, freeze-drying, 900 degrees Ar gas sintering for 2 hours to prepare the target composite electrode material.

[0037] The obtained composite material has been examined by SEM and TEM, and the structure is basically similar to that of the material obtained in Example 1.

[0038] The ground composite material is fully ground and used as the negative electrode material of the lithium ion electrode, mixed with carbon black and carboxymethyl cellulose in a ratio of 70:15:15 parts by weight, and the film is dried in vacuum at 70°C for 6 hours to prepare A composite elec...

Embodiment 3

[0040] The 100nm Si powder was sintered in a muffle furnace at a high temperature of 500°C for 1h. Take 0.1g carboxylated multi-arm carbon nanotubes and disperse them in 30mL deionized water uniformly by ultrasonic, then disperse 0.2g sintered silicon powder in the above mixed solution, and disperse 0.2g P123 and 1g pea powder in the mixed solution after uniform ultrasonication. Stir evenly at room temperature, then heat to a paste, put it in the refrigerator and freeze for 6 hours. Then, freeze-drying, 500 degrees Ar gas sintering for 6 hours to prepare the target composite electrode material.

[0041] The obtained composite material has been examined by SEM and TEM, and the structure is basically similar to that of the material obtained in Example 1.

[0042] The ground composite material is fully ground and used as the negative electrode material of the lithium ion electrode, mixed with carbon black and carboxymethyl cellulose in a ratio of 70:15:15 parts by weight, and the fil...

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Abstract

The invention discloses a high-performance composite material and its preparation method and application. The composite material is mainly made of water-soluble starch and active substances. The starch is carbonized at high temperature, and the nanoparticles of the active substances exist in the interior of the carbon structure. , forming a coating structure, and there are abundant microporous structures in the entire composite structure. Compared with the prior art, the present invention has simple process steps, short reaction time, good repeatability, high yield, low cost, and good potential for large-scale application; the preparation steps and the raw materials used are green and environmentally friendly; the prepared composite electrode The electrochemical performance of the electrode has been significantly improved, and it is used to prepare a lithium ion electrode, which has good cycle stability and excellent charge and discharge performance.

Description

Technical field [0001] The invention relates to the technical field of composite materials, in particular to a preparation method of a negative electrode composite material using a traditional jelly powder preparation method, a preparation method and application in a lithium ion battery. Background technique [0002] Lithium-ion battery has the advantages of high open circuit voltage, high energy density, long service life, no memory effect, less pollution and low self-discharge rate. It is better than other traditional secondary batteries in overall performance, and is consistently regarded as a variety of portable The most ideal power supply for electronic equipment and electric vehicles. Although graphite, a traditional lithium-ion battery anode material, has good cycle stability and high cost performance, its charge-discharge specific capacity is low, and its volumetric capacity has no advantage. It is difficult to meet the power system, especially electric vehicles and hybri...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/48H01M4/50H01M4/52H01M4/583H01M4/62H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/366H01M4/38H01M4/386H01M4/387H01M4/48H01M4/50H01M4/52H01M4/583H01M4/625H01M10/0525Y02E60/10
Inventor 张文惠岳鹿徐宁罗改霞关荣峰
Owner 王俐
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