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Preparation method of carbon-coated metal oxide-graphene composite electrode material

A graphene composite and electrode material technology, applied to battery electrodes, circuits, electrical components, etc., can solve the problems of volume effect, unstable polarization structure, large battery voltage hysteresis, poor cycle stability, etc., to overcome volume effect and Polarization phenomenon, increased capacity, and high production efficiency

Inactive Publication Date: 2015-01-07
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, during the electrode reaction process of metal oxides, there are generally serious problems such as serious volume effect, polarization phenomenon and structural instability, which lead to large voltage hysteresis and poor cycle stability during charging and discharging.
In addition, the nanometer-sized metal element formed in situ during the discharge of such materials usually catalyzes side reactions of the electrolyte on the surface of the electrode material, which not only consumes a large amount of electrolyte, but also causes safety problems.

Method used

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  • Preparation method of carbon-coated metal oxide-graphene composite electrode material
  • Preparation method of carbon-coated metal oxide-graphene composite electrode material

Examples

Experimental program
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Effect test

Embodiment 1

[0028] 1) Preparation of graphite oxide:

[0029] Get 10g (8000 order) natural flake graphite and 500ml mass concentration be 98% sulfuric acid after mixing uniformly, add 10.0g potassium nitrate, add 60g potassium permanganate rapidly in the water bath of 15 ℃, mix uniformly. Then the temperature of the system was raised to 40°C, reacted for 3h, then added 300ml of water, and simultaneously the system was heated to 80°C for 30min, then the excess potassium permanganate was reduced with 500ml of distilled water and 100ml of hydrogen peroxide (30wt%), and centrifugally washed to The pH was 5, and the graphite oxide solid was obtained by vacuum drying at 40°C.

[0030] 2) preparation of graphene oxide aqueous solution:

[0031] Weigh 150 mg of graphite oxide solid and disperse it in 50 ml of water to prepare a graphite oxide suspension with a mass concentration of 3.0 g / L. Ultrasonic the suspension for 2 hours at a frequency of 40 kHz to achieve single-layer peeling and obtain ...

Embodiment 2

[0039] 1) Preparation of graphene oxide aqueous solution:

[0040] Weigh 5 mg of the graphite oxide solid prepared in Example 1 and disperse it in 50 ml of water to prepare a graphite oxide suspension with a mass concentration of 0.1 g / L. The suspension is ultrasonicated for 1 h at a frequency of 60 kHz to realize single-layer peeling. Obtain a uniform and stable graphene oxide dispersion;

[0041] 2) Carbon coated Co 3 o 4 And the preparation of graphene composite nanomaterials:

[0042] Preparation 12ml mass concentration is 0.01g / ml Co(C 2 h 3 o 2 ) 2 4H 2 O solution and 12ml of chitosan solution with a mass concentration of 0.01g / ml were added to 26ml of graphene oxide dispersion for mixing, ultrasonically dispersed for 10min at a frequency of 60kHz, and the dispersed solution was transferred to the hydrothermal reaction In the kettle, react at 180°C for 24 hours, cool naturally, centrifuge and wash with distilled water at 20,000 rpm for 4 times, each time for 3 mi...

Embodiment 3

[0046] 1) Preparation of graphene oxide aqueous solution:

[0047] Weigh 500 mg of the graphite oxide solid prepared in Example 1 and disperse it in 50 ml of water to prepare a graphite oxide suspension with a mass concentration of 10.0 g / L, and ultrasonicate the suspension for 5 hours at a frequency of 80 kHz to achieve single-layer exfoliation , to obtain a uniform and stable graphene oxide dispersion;

[0048] 2) Carbon coated Mn 3 o 4 Preparation of composite nanomaterials:

[0049] The preparation 9ml mass concentration is 0.1g / ml Mn(CH 3 COO) 2 Solution and 9ml of sucrose solution with a mass concentration of 1.0g / ml were added to 32ml of graphene oxide dispersion for mixing, and ultrasonically dispersed for 5min at a frequency of 80kHz, and the dispersed solution was transferred into a hydrothermal reaction kettle, React at 220°C for 24 hours, cool naturally, centrifuge and wash with distilled water at 6000rpm for 4 times, each centrifugation time is 24min, and the...

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Abstract

The invention relates to a preparation method of a carbon-coated metal oxide-graphene composite electrode material. The preparation method comprises the steps of preparing a suspension graphite oxide liquid, carrying out ultrasonic dispersion, preparing a metal oxide precursor solution and a carbon source pecursor solution, carrying out the ultrasonic dispersion and mixing so as to obtain a dispersed solution, transferring the dispersed solution into a hydrothermal reaction kettle for reaction, cooling naturally, washing centrifugally, freezing, drying to obtain dried powder, and calcining the dried powder in a protective atmosphere to obtain the carbon-coated metal oxide-graphene composite electrode material. A one-step hydrothermal method is adopted for constructing a carbon-coated-graphene double protection composite structure, while the nanoscale metal oxide is prepared, a carbon coating manner and grapheme are compounded, the double protection composite structure can effectively overcome the volume effect and the severe polarization phenomenon in the charging and discharging process of metal oxide and can greatly improve the capacity and the cycling stability of a battery. The preparation method is simple, easy to implement, and suitable for large-scale industrial promotion.

Description

Technical field: [0001] The invention relates to a preparation method of a lithium ion battery electrode material, in particular to a preparation method of a carbon-coated metal oxide-graphene composite electrode material, which belongs to a preparation method of a high-capacity, high-efficiency lithium-ion battery electrode material. Background technique: [0002] With the increasing reduction of oil, coal and other energy sources, human society is facing an increasingly serious energy crisis. As a high-performance green energy storage device, lithium-ion batteries have the characteristics of good performance, safety, low cost and environmental friendliness, and have become the first choice for large-scale power sources such as pure electric vehicles (EV), hybrid electric vehicles (HEV) and aerospace . The performance of electrode materials directly affects the performance of lithium-ion batteries. Therefore, electrode materials with high capacity, reliable cycle and safet...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/131H01M4/1391
CPCH01M4/131H01M4/1391H01M4/366H01M4/625H01M10/0525H01M2004/021Y02E60/10
Inventor 暴宁钟朱文彬何大方
Owner NANJING UNIV OF TECH
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