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Preparation method for foam graphene compound indium zinc sulfide material

A technology of foamed graphene and indium zinc sulfide, applied in the field of material chemistry, can solve the problems of slow diffusion capacity, low theoretical specific capacity, limiting battery energy and power density, etc., achieve obvious structure, strong adsorption, and inhibit volume expansion effect Effect

Inactive Publication Date: 2018-11-27
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

However, the relatively low theoretical specific capacity (372mAh g -1 ) and the slow Li + Diffusion capability, which greatly limits the energy and power density of the battery

Method used

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  • Preparation method for foam graphene compound indium zinc sulfide material
  • Preparation method for foam graphene compound indium zinc sulfide material
  • Preparation method for foam graphene compound indium zinc sulfide material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] (1) Preparation of graphene oxide

[0024] Place graphene oxide in deionized water to prepare a graphene oxide aqueous solution with a concentration of 10 mg / mL, and disperse it ultrasonically for 10 minutes;

[0025] (2) Preparation of foamed graphene

[0026] Cut the nickel foam with a thickness of 1 mm into a square with a side length of 2 cm, immerse it in 10 mL of the graphene oxide aqueous solution prepared in step (1), and disperse it ultrasonically for 30 minutes so that the graphene oxide is fully immersed in the porous structure of the nickel foam. The completed nickel foam is taken out, then immersed in a 20 mg / ml sodium ascorbate solution, and soaked for 24 hours to fully reduce the graphene oxide to obtain a precursor, and then immerse the prepared precursor in polydimethylsiloxane, After soaking for 60 minutes, place it in an oven and dry at 80°C for 24 hours to obtain a graphene-nickel foam composite, then place the graphene-nickel foam composite in 98% ...

Embodiment 2

[0032] (1) Preparation of graphene oxide

[0033] Graphene oxide was placed in deionized water, configured into a graphene oxide aqueous solution with a concentration of 5 mg / mL, and ultrasonically dispersed for 5 minutes;

[0034] (2) Preparation of foamed graphene

[0035] Cut the nickel foam with a thickness of 1 mm into a square with a side length of 2 cm, immerse it in 5 mL of the graphene oxide aqueous solution prepared in step (1), and disperse it ultrasonically for 20 minutes so that the graphene oxide is fully immersed in the porous structure of the nickel foam. The completed nickel foam is taken out, then immersed in a 10 mg / ml sodium ascorbate solution, and soaked for 12 hours to fully reduce the graphene oxide to obtain a precursor, and then immerse the prepared precursor in polydimethylsiloxane, After soaking for 30 minutes, place in an oven and dry at 50°C for 12 hours to obtain a graphene-nickel foam composite, then place the graphene-nickel foam composite in 98%...

Embodiment 3

[0039] (1) Preparation of graphene oxide

[0040] Graphene oxide was placed in deionized water, configured into a graphene oxide aqueous solution with a concentration of 8 mg / mL, and ultrasonically dispersed for 10 minutes;

[0041] (2) Preparation of foamed graphene

[0042] Cut the nickel foam with a thickness of 1 mm into a square with a side length of 2 cm, immerse it in 8 mL of the graphene oxide aqueous solution prepared in step (1), and disperse it ultrasonically for 25 minutes to fully immerse the graphene oxide in the porous structure of the nickel foam. The completed nickel foam is taken out, then immersed in a 15 mg / ml sodium ascorbate solution, and soaked for 18 hours to fully reduce the graphene oxide to obtain a precursor, and then immerse the prepared precursor in polydimethylsiloxane, After soaking for 30 minutes, put it in an oven and dry at 70°C for 18 hours to obtain a graphene-nickel foam composite, then place the graphene-nickel foam composite in 98% conc...

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Abstract

The invention belongs to the field of material chemistry and relates to a preparation method for a cathode material of a lithium ion battery. The method comprises three steps: preparing graphene oxide, preparing foam graphene and preparing a foam graphene compound indium zinc sulfide material. The cathode material with higher charge-discharge specific capacity and better cycle performance is acquired by introducing graphene foams and indium zinc sulfide as cathode active materials; the initial charge-discharge capacity can reach up to 742.17mAh / g; after 200 times of circulation, the cathode material still has a reversible capacity of 415.23mAh / g.

Description

technical field [0001] The technical solution of the present invention relates to a method for preparing a negative electrode material of a lithium ion battery with high specific capacity, in particular to a method for directly growing an indium-zinc sulfide composite material on the surface of foamed graphene, which belongs to the field of material chemistry. Background technique [0002] From 1980 when Armand first proposed the idea of ​​rocking chair batteries (Rocking Chair Batries) and Murphy and others confirmed the possibility of lithium-ion batteries, to 1990 Sony officially launched the LiCoO battery to the market. 2 After a series of developments, lithium-ion batteries are widely used in various fields such as military equipment, mobile phones, notebook computers, power tools, electric vehicles, and grid energy storage. With the acceleration of economic globalization, the increasing demand for energy and the increasingly severe environmental pollution, the developm...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/587H01M4/58H01M10/0525
CPCH01M4/366H01M4/5815H01M4/587H01M10/0525H01M2004/021H01M2004/027Y02E60/10
Inventor 张永光王加义
Owner INT ACAD OF OPTOELECTRONICS AT ZHAOQING SOUTH CHINA NORMAL UNIV
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