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A nanocrystalline coo-graphene composite material and its preparation and application

A composite material, graphene technology, applied in nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve problems affecting cycle performance, electrode pulverization, capacity decay, etc., and achieve high theoretical capacitance. , the preparation process is simple and cheap, and the cost is low

Active Publication Date: 2017-01-18
INST OF CHEM MATERIAL CHINA ACADEMY OF ENG PHYSICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when this type of material is used as the negative electrode of a lithium-ion battery, during the charging and discharging process of the lithium-ion battery, a large volume change will occur with the intercalation / extraction of lithium ions, resulting in pulverization or cracks inside the electrode, reducing the capacity. Rapid attenuation, thereby affecting cycle performance

Method used

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  • A nanocrystalline coo-graphene composite material and its preparation and application
  • A nanocrystalline coo-graphene composite material and its preparation and application
  • A nanocrystalline coo-graphene composite material and its preparation and application

Examples

Experimental program
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Effect test

Embodiment 1

[0042] With 5g natural graphite, 5.0g potassium persulfate (K 2 S 2 o 8 ) and 5.0g phosphorus pentoxide (P 2 o 5 ) into 60mL of concentrated sulfuric acid in turn, kept at 80°C for 6h and then cooled to room temperature. After the mixed solution was suction filtered, the resulting solid matter was diluted and washed with deionized water, and then vacuum-dried to obtain pre-oxidized graphite. Take by weighing this preoxidized graphite 2.5g, potassium permanganate (KMnO 4 ) 7.5g was added to concentrated sulfuric acid at 0°C in turn, first kept at 20°C for 2.5h, then added ionized water and stirred for 1.5h, and finally added 30% H 2 o 2 Until the reaction is complete, filter the above mixture and wash it twice with dilute hydrochloric acid to remove metal ions; then wash it with deionized water to remove excess acid; then take 800mL deionized water to disperse and ultrasonicate for 30min to obtain graphene oxide (GO) An aqueous solution, the solution is frozen to freeze, ...

Embodiment 2

[0046] With 10g natural graphite, 10g potassium persulfate (K 2 S 2 o 8 ) and 10g phosphorus pentoxide (P 2 o 5 ) into 60mL of concentrated sulfuric acid in turn, kept at 80°C for 6h, cooled to room temperature, washed with deionized water, and then vacuum-dried to obtain pre-oxidized graphene. Weighed the pre-oxidized graphene 2.5g, potassium permanganate (KMnO 4 ) 7.5g was added to concentrated sulfuric acid at 0°C in turn, first kept at 20°C for 2.5h, added deionized water and stirred for 1.5h, and finally added H 2 o 2 When the reaction is complete, the above mixture is filtered, and washed twice with dilute hydrochloric acid to remove metal ions, and then washed with deionized water to remove excess acid, and then take 800mL of deionized water to disperse it, and the dispersion method is ultrasonic 30min, to obtain Graphene oxide (GO) aqueous solution, the solution is frozen to freeze, and then the ice is completely sublimated and the remaining solid is dried to obt...

Embodiment 3

[0050] With 5g natural graphite, 5.0g potassium persulfate (K 2 S 2 o 8 ) and 5.0g phosphorus pentoxide (P 2 o 5 ) into 60mL of concentrated sulfuric acid in sequence, kept at 80°C for 6h, cooled to room temperature, diluted with deionized water, washed, and then vacuum-dried to obtain pre-oxidized graphene. Take this preoxidized graphene 2.5g, potassium permanganate (KMnO 4 ) 7.5g into concentrated sulfuric acid at 0°C in turn, first keep warm at below 20°C for 2.5h, then at 35°C for 3.5h, then add about 230mL of deionized water at 95°C and keep at 95°C for 1.5h, and finally add 30% H 2 o 2 Until the reaction is complete, filter the above mixture and wash it twice with dilute hydrochloric acid to remove metal ions; then wash it with deionized water to remove excess acid; then take 800mL deionized water to disperse and ultrasonicate for 30min to obtain graphene oxide (GO) Aqueous solution, freeze-dried to obtain graphite oxide powder.

[0051] With GO and precipitated C...

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Abstract

The invention discloses a graphene composite material, in particular a CoO and graphene composite material. The invention also relates to a preparation method of the graphene composite material and application of the graphene composite material in a lithium-ion battery. The preparation method comprises the steps of performing low-temperature recrystallization on cobalt acetate tetrahydrate, compositing the recrystallized cobalt acetate tetrahydrate and graphene oxide to obtain a precursor, and performing low-temperature annealing on the precursor under a high vacuum environment to obtain two-dimensional nano crystalline CoO-graphene composite material, wherein single-layer graphene with the thickness of 1-50 micrometers is taken as a carrier frame, and CoO nanocrystals with the average particle diameter of 2-20 nm are uniformly embedded in the upper and lower surfaces of the single-layer graphene. The prepared nano crystalline CoO-graphene composite material can be used as the negative electrode of a lithium-ion battery to effectively improve the capacitance of the lithium-ion battery; the preparation method is simple, the preparation period is short, the preparation efficiency is high, no toxic effect exists, the environment pollution is avoided, and the potential safety hazard is reduced.

Description

technical field [0001] The invention relates to a graphene composite material, in particular to a composite material composed of CoO and graphene. The invention also relates to a preparation method of the graphene composite material and its application in lithium-ion batteries. Background technique [0002] In recent years, laptops, mobile phones, digital cameras, video cameras and other digital electronic devices that are closely related to life have become increasingly miniaturized, portable, and multi-functional. Therefore, batteries are required to develop in the direction of miniaturization, large capacity, and long-life charging and discharging. . After nickel-cadmium and nickel-metal hydride batteries, lithium-ion batteries have the advantages of high energy density, high power, long cycle life, stable working voltage, no memory effect, low self-discharge rate, and low environmental pollution. wide range of secondary batteries. The negative electrode material of lit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/52H01M4/62H01M4/131B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00H01M4/525H01M4/587H01M4/625Y02E60/10
Inventor 王斌程建丽官群
Owner INST OF CHEM MATERIAL CHINA ACADEMY OF ENG PHYSICS
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