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Double-shell-layer structure composite material, preparation method of double-shell-layer structure composite material, and lithium ion battery containing composite material

A composite material, double-shell technology, applied in battery electrodes, secondary batteries, structural parts, etc., can solve the problems of inability to meet commercial anode materials, large volume expansion, and poor cycle retention.

Active Publication Date: 2018-09-07
BTR NEW MATERIAL GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Although a large number of literatures have reported methods to improve the electrochemical performance of silicon-based materials, compared with commercial graphite materials, the volume expansion of the materials prepared by these methods is still large, and the cycle retention rate is poor, which is far from meeting the requirements of commercialization. Demand for anode materials

Method used

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  • Double-shell-layer structure composite material, preparation method of double-shell-layer structure composite material, and lithium ion battery containing composite material
  • Double-shell-layer structure composite material, preparation method of double-shell-layer structure composite material, and lithium ion battery containing composite material
  • Double-shell-layer structure composite material, preparation method of double-shell-layer structure composite material, and lithium ion battery containing composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0079] (1) Disperse nano-silicon with a median particle size of 100 nm in a mixed solvent of ethanol and deionized water, the mass ratio of ethanol and deionized water is 8:2, and ultrasonically stir for 1 h to obtain precursor suspension A.

[0080] (2) Add copper sulfate solid with a molar ratio of 10:3 to the precursor suspension A under stirring conditions, then add 0.5mol / L hydrochloric acid solution dropwise to the solution to adjust the pH=3 of the solution, After ultrasonic stirring for 0.5h, continue to slowly add 0.5mol / L sodium hydroxide solution to it, so that the copper particles are transformed into copper hydroxide and evenly coated on the surface of the nano-silicon particles, and the dripping is stopped when the pH of the solution is 7 Add sodium hydroxide solution, continue stirring for 0.5 h, filter, and dry to obtain precursor 1.

[0081] (3) Disperse the precursor 1 obtained in step (2) in deionized water, add glucose with a mass ratio of 1:2 to the precur...

Embodiment 2

[0088] (1) Disperse nano-silicon with a median particle size of 100 nm in a mixed solvent of ethanol and deionized water, the mass ratio of ethanol and deionized water is 8:3, and ultrasonically stir for 1 h to obtain precursor suspension A.

[0089](2) Add copper chloride solid with a nano-silicon molar ratio of 10:3 to the precursor suspension A under stirring conditions, and then add 0.5mol / L hydrochloric acid solution dropwise to the solution to adjust the pH of the solution to 3 After ultrasonic stirring for 0.5h, continue to slowly add 0.5mol / L sodium hydroxide solution to it, so that the copper particles are converted into copper hydroxide and evenly coated on the surface of the nano-silicon particles, and the dripping is stopped when the pH of the solution is 7. Add sodium hydroxide solution, continue stirring for 0.5 h, filter, and dry to obtain precursor 1.

[0090] (3) Disperse the precursor obtained in step (2) in deionized water, add aniline monomer with a mass ra...

Embodiment 3

[0092] (1) Disperse nano-silicon with a median particle size of 100 nm in ethanol / deionized water mixed solvent, the mass ratio of ethanol and deionized water is 1:1, and ultrasonically stir for 1 h to obtain precursor suspension A.

[0093] (2) Add copper chloride solid with a nano-silicon molar ratio of 10:3 to the precursor suspension A under stirring conditions, and then add 0.5mol / L hydrochloric acid solution dropwise to the solution to adjust the pH of the solution to 3 After ultrasonic stirring for 0.5h, continue to slowly add 0.5mol / L sodium hydroxide solution to it, so that the copper particles are converted into copper hydroxide and evenly coated on the surface of the nano-silicon particles, and the dripping is stopped when the pH of the solution is 7. Add sodium hydroxide solution, continue stirring for 0.5 h, filter, and dry to obtain precursor 1.

[0094] (3) Disperse the precursor 1 and asphalt obtained in step (2) in the n-butanol solution at a mass ratio of 55:...

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Abstract

The invention discloses a double-shell-layer structure composite material, a preparation method of the double-shell-layer structure composite material, and a lithium ion battery containing the composite material. The double-shell-layer structure composite material comprises a nanometer silicon inner core, wherein a first coating layer and a second coating layer are sequentially arranged on the surface of the inner core; the first coating layer is nanometer metal particles embedded on the surface of the inner core; pores are formed between the nanometer metal particles; the second coating layeris a carbon coating layer positioned at the outer most layer of the composite material. Firstly, a layer of metal hydroxide covers in situ on the surface of the nanometer silicon particles; then, thesurface is subjected to organic carbon coating; the coating layer organic carbon is subjected to high-temperature carbonization, metal hydroxide of the first coating layer is firstly decomposed intometal oxides and is then reduced into nanometer metal simple substance particles by the carbon coating layer of the second coating layer; a great number of pores are left; the double-shell-layer structure composite material is obtained. The process is simple; when the composite material is used for a negative electrode of the lithium ion battery, the high specific volume and excellent circulationperformance are realized.

Description

technical field [0001] The invention belongs to the field of lithium-ion battery negative electrode materials, and relates to a double-shell structure composite material, a preparation method thereof and a lithium-ion battery containing the composite material, in particular to a double-shell structure silicon / nano-copper / carbon composite negative electrode material , a preparation method thereof and a lithium ion battery comprising the composite negative electrode material. Background technique [0002] At present, the anode materials of commercialized lithium-ion secondary batteries are mostly natural graphite, artificial graphite, and various graphite materials in the middle, although graphite materials have many advantages, such as abundant raw materials, low lithium intercalation potential, and good cycle performance. However, the theoretical capacity of graphite materials is only 372mA h / g, which cannot meet the increasing demand for high-energy-density lithium-ion batt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/0525
CPCH01M4/366H01M4/386H01M4/625H01M4/626H01M4/628H01M10/0525Y02E60/10
Inventor 何鹏车宗洲任建国黄友元岳敏
Owner BTR NEW MATERIAL GRP CO LTD
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