Preparation method and application of silicon-based composite negative electrode material for lithium ion battery

A technology for lithium ion batteries and negative electrode materials, which is applied in the fields of electrochemical materials and new energy, can solve problems such as poor electrical conductivity, and achieve the effects of suppressing volume expansion, improving electronic conductivity, and improving Coulomb efficiency.

Active Publication Date: 2020-12-11
CHINA AVIATION LITHIUM BATTERY RES INST CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although heteropolyacids can be used for lithium storage, their electrical conductivity is poor, and further improvement is needed to better exert their potential performance.
[0005] Up to now, there are few studies and reports on the combination of nano-silicon and heteropoly acid as anode materials for lithium-ion batteries.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Disperse 1 mol of nano-silicon with a particle size of 80 nm and 0.2 mol of polyaniline in absolute ethanol, set the ultrasonic power to 120 W, and the ultrasonic dispersion time to 30 min. The homogeneous mixed solution obtained after dispersion was dried into powder by using a spray dryer. The inlet air temperature of the spray dryer was 200° C., the outlet air temperature was 120° C., and the constant flow pump speed was 80 rpm. The spray-dried powder was transferred to the reaction chamber, and nitrogen gas with a flow rate of 150 sccm was introduced, and the temperature was raised to 500° C. at a rate of 5° C. / min, and maintained for 120 minutes. Then turn off the heating switch of the reaction chamber, cool down to room temperature naturally, and collect the silicon / amorphous carbon composite material. Then 0.05mol of heteropolyacid [PSi 12 o 40 ] n- Disperse together with silicon / amorphous carbon in absolute ethanol, the power of the ultrasonic wave used is 12...

Embodiment 2

[0026] Disperse 1 mol of nano-silicon with a particle size of 80 nm and 0.2 mol of polypyrrole in absolute ethanol, set the ultrasonic power to 120 W, and the dispersion time to 15 minutes. The homogeneous mixed solution obtained after dispersion was dried into powder by using a spray dryer. The inlet air temperature of the spray dryer was 200° C., the outlet air temperature was 120° C., and the constant flow pump speed was 80 rpm. The spray-dried powder was transferred to the reaction chamber, and nitrogen gas with a flow rate of 150 sccm was introduced, and the temperature was raised to 500° C. at a rate of 5° C. / min, and maintained for 120 minutes. Then turn off the heating switch of the reaction chamber, cool down to room temperature naturally, and collect the silicon / amorphous carbon composite material. Then 0.05mol of heteropolyacid [MoSi 12 o 40 ] n- Disperse together with silicon / amorphous carbon in absolute ethanol, the power of the ultrasonic wave used is 120W, an...

Embodiment 3

[0028] Disperse 1 mol of nano-silicon with a particle size of 80nm and 0.2 mol of polypyrrole in methanol, set the ultrasonic power to 100W, and the dispersion time to 25min. The homogeneous mixed solution obtained after dispersion was dried into powder by using a spray dryer. The inlet air temperature of the spray dryer was 200° C., the outlet air temperature was 120° C., and the constant flow pump speed was 80 rpm. The spray-dried powder was transferred to the reaction chamber, and nitrogen gas with a flow rate of 150 sccm was introduced, and the temperature was raised to 500° C. at a rate of 5° C. / min, and maintained for 120 minutes. Then turn off the heating switch of the reaction chamber, cool down to room temperature naturally, and collect the silicon / amorphous carbon composite material. Then 0.08mol of heteropolyacid [MoSi 12 o 40 ] n- Disperse together with silicon / amorphous carbon in propanol, the ultrasonic power used is 120W, and the dispersion time is 30min. By...

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Abstract

The invention discloses a preparation method and an application of a lithium ion battery silicon-based negative electrode material, and belongs to the field of electrochemical materials and new energyresources. The preparation method of the negative electrode material includes the steps: (1) dispersing nano-silicon and conductive macromolecules in an organic solvent to obtain mixed solution, andperforming spray-drying and high-temperature heat treatment on the mixed solution to obtain a silicon / amorphous carbon composite material; (2) collectively dispersing the silicon / amorphous carbon composite material and heteropoly acid in the organic solvent, and spray-drying mixture to obtain silicon / amorphous carbon composite material adsorbed by the heteropoly acid; (3) collectively dispersing the composite material acquired in the step (2) and the conductive macromolecules again, and spray-drying mixture to obtain the silicon-based negative electrode material with a multilayer structure ofsilicon / amorphous carbon / heteropoly acid / conductive macromolecule. The negative electrode material is simple in preparation route and has high charging and discharging capacity and excellent circulation performance and potential application prospects in the field of high-performance lithium ion batteries.

Description

technical field [0001] The invention belongs to the field of electrochemical materials and new energy sources, and in particular relates to a preparation method and application of a silicon-based composite negative electrode material for a lithium-ion battery. Background technique [0002] According to the country's "Medium and Long-Term Development Plan for the Automobile Industry", the next development goal of my country's power batteries is: by 2020, the specific energy of the monomer will reach more than 300Wh / kg, and the specific energy of the system will reach more than 250Wh / kg; by 2025, the new system will A breakthrough has been made in battery technology, and the specific energy of a single cell has reached more than 500Wh / kg. At present, the secondary battery systems related to lithium-ion mainly include lithium-ion batteries, lithium-sulfur batteries and lithium-air batteries. Restricted by factors, the prospect of industrial application in recent years is not gr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/583H01M4/60H01M4/62H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/366H01M4/386H01M4/583H01M4/60H01M4/624H01M4/625H01M10/0525Y02E60/10
Inventor 叶剑波高娇阳赵晓锋李康李利淼
Owner CHINA AVIATION LITHIUM BATTERY RES INST CO LTD
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