Graphene foam-nickel oxide composite electrode material and preparation method thereof

A technology of graphene foam and composite materials, which is applied in the field of lithium-ion batteries, can solve the problems of easy agglomeration, pulverization and volume expansion, and poor conductivity of metal oxides, so as to increase the contact area, accelerate the conductivity, and make the preparation process environmentally friendly. Effect

Pending Publication Date: 2018-09-28
JIANGSU UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to solve technical problems such as poor conductivity, easy agglomeration, pulverization and volume expansion of metal oxides in the process of charging and discharging, and provide a graphene foam-nickel oxide composite electrode material, which can be used as the negative electrode material of lithium-ion batteries. , with large specific capacity, good cycle stability and high rate capability

Method used

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  • Graphene foam-nickel oxide composite electrode material and preparation method thereof
  • Graphene foam-nickel oxide composite electrode material and preparation method thereof
  • Graphene foam-nickel oxide composite electrode material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0030] 1) Preparation of graphene foam

[0031] Depositing graphene on nickel foam by chemical vapor deposition method: Place the nickel foam (1 cm × 1 cm) in a tube furnace while passing CH 4 , H 2 Mix gas with Ar (volume ratio 1:16:40), then heat up to 1000°C at a rate of 5°C / min, hold for 30 minutes, and then cool to room temperature at a rate of 100°C / min to obtain graphene-coated Foam nickel. The prepared product is placed in a mixed solution of ferric chloride (1.5 mol / L) and hydrochloric acid (hydrochloric acid mass fraction is 5%), soaked for 12 h, then taken out, washed with deionized water and dried to obtain graphene foam .

[0032] 2) Preparation of graphene foam-nickel-based metal organic framework composite material

[0033] Using water / ethanol / N,N-dimethylformamide (volume ratio 1:1:1) as a solvent, nickel chloride (0.31 g), trimesic acid (0.15 g) and polyvinylpyrrolidone (1.50 g) 15 mL of the mixed solution of ), and then placed in a 50 mL stainless steel reactor t...

Embodiment 2

[0037] 1) Preparation of graphene foam

[0038] Depositing graphene on nickel foam by chemical vapor deposition: Place the nickel foam (1 cm × 1 cm) in a tube furnace, and simultaneously pass CH4, H2 and Ar mixed gas (volume ratio 1:16:40) , And then heated to 1100 ℃ at a rate of 5 ℃ / min, kept for 20 min, and then cooled to room temperature at a rate of 100 ℃ / min to obtain graphene-coated nickel foam. The prepared product is placed in a mixed solution of ferric chloride (1.0 mol / L) and hydrochloric acid (hydrochloric acid mass fraction is 5%), soaked for 18 hours, then taken out, washed with deionized water and dried to obtain graphene foam .

[0039] 2) Preparation of graphene foam-nickel-based metal organic framework composite material

[0040] Using water / ethanol / N,N-dimethylformamide (volume ratio 1:1:1) as solvents, nickel nitrate (0.43 g), trimesic acid (0.15 g) and polyvinylpyrrolidone (1.50 g) were prepared Put 20 mL of the mixed solution of the mixture with graphene foam ...

Embodiment 3

[0044] 1) Preparation of graphene foam

[0045] Depositing graphene on nickel foam by chemical vapor deposition: Place the nickel foam (1 cm × 1 cm) in a tube furnace, and simultaneously pass CH4, H2 and Ar mixed gas (volume ratio 1:16:40) , And then heated to 1100 ℃ at a rate of 5 ℃ / min, kept for 20 min, and then cooled to room temperature at a rate of 100 ℃ / min to obtain graphene-coated nickel foam. The prepared product is placed in a mixed solution of ferric chloride (1.0 mol / L) and hydrochloric acid (hydrochloric acid mass fraction is 5%), soaked for 18 hours, then taken out, washed with deionized water and dried to obtain graphene foam .

[0046] 2) Preparation of graphene foam-nickel-based metal organic framework composite material

[0047] Using water / ethanol / N,N-dimethylformamide (volume ratio 1:1:1) as solvents, nickel nitrate (0.43 g), trimesic acid (0.15 g) and polyvinylpyrrolidone (1.50 g) were prepared 30 mL of the mixed solution, and then placed in a 50 mL stainless ...

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Abstract

The invention discloses a graphene foam-nickel oxide composite electrode material and a preparation method thereof, belonging to the field of lithium ion batteries. The method comprises the followingsteps: preparing nickel foam wrapped by graphene through a chemical vapor deposition method, etching to remove metal nickel and then obtaining graphene foam; preparing mixed solution of nickel salt, trimesic acid and polyvinylpyrrolidone, performing solvothermal reaction with the prepared graphene foam, obtaining a graphene foam-nickel base metal organic skeleton composite material, further performing high-temperature calcination for the graphene foam-nickel base metal organic skeleton composite material to obtain the graphene foam-nickel oxide composite electrode material. When the material prepared by the method provided by the invention is used for a negative electrode of the lithium ion battery, the material presents high specific capacity, high circulating stability and good rate capability. The preparation technology of the material provided by the invention is simple and reliable, low-cost and environment-friendly in a preparation process, and has wide application foreground.

Description

Technical field [0001] The invention belongs to the technical field of lithium ion batteries, and particularly relates to a graphene foam-nickel oxide composite electrode material and a preparation method thereof. Background technique [0002] Lithium-ion batteries have the advantages of high energy density, long cycle life and fast charge and discharge, and become a current energy storage device with great development potential. Metal oxides such as NiO, Co 3 O 4 , Fe 2 O 3 , MnO 2 Due to their high specific capacity, CuO and CuO are widely used as electrode materials for lithium-ion batteries. In recent years, metal-organic framework materials have shown good application prospects in the electrochemical field due to their large specific surface, rich pores, and ease of synthesis. There have been a large number of literature reports using metal-organic framework materials as precursors to prepare Metal oxides with different compositions and morphologies. However, these oxides ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/583H01M4/62H01M10/0525H01M4/48C01B32/182
CPCH01M4/362H01M4/48H01M4/583H01M4/625H01M10/0525C01B32/182Y02E60/10
Inventor 周虎邵金潇袁爱华
Owner JIANGSU UNIV OF SCI & TECH
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