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Carbon-coated nickel oxide nanosheets supported on graphene nanocomposite and preparation method thereof

A nanocomposite material, graphene technology, applied in the field of lithium battery negative electrode material and its preparation, can solve the problems of complex preparation process, difficult to obtain a uniform structure, etc., to promote diffusion, good stability of multiple charge and discharge, outstanding performance Effect of magnification performance

Inactive Publication Date: 2017-07-07
FUDAN UNIV
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  • Summary
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, although many works have reported the in-situ growth of NiO nanocomposites with various structures on the surface of conductive carbon materials, there are few reports on the in-situ loading of carbon-coated NiO nanoparticles on conductive substrates. Due to the complex preparation process of this material, it is difficult to obtain a uniform structure

Method used

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  • Carbon-coated nickel oxide nanosheets supported on graphene nanocomposite and preparation method thereof
  • Carbon-coated nickel oxide nanosheets supported on graphene nanocomposite and preparation method thereof
  • Carbon-coated nickel oxide nanosheets supported on graphene nanocomposite and preparation method thereof

Examples

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Effect test

Embodiment 1

[0028](1) Pour 600 ml of commercially available tetrahydrofuran into a 1000 ml flask, add 15 g of calcium hydride, then stir at room temperature for 24 h, then distill off the solvent at 70°C to obtain anhydrous tetrahydrofuran;

[0029] (2) The graphene oxide (GO) aqueous dispersion prepared by the improved Hummers method was centrifuged with an anhydrous solvent obtained by adding one step six times to obtain an anhydrous tetrahydrofuran dispersion of GO, and the concentration of GO was 7.5 mg / ml;

[0030] (3) Weigh 0.105 g of bis(cyclopentadiene)nickel and add it to 8 ml of anhydrous tetrahydrofuran, sonicate for 10 min to fully dissolve the bis(cyclopentadiene)nickel; then add 2 ml of GO in anhydrous solvent dispersion , sonicated for 30 min to help disperse; then the mixture was transferred to a 25 ml autoclave, and placed in an oven at 210°C for 24 h; after naturally cooling to room temperature, the material liquid was taken out and washed 5 times by centrifugation with a...

Embodiment 2

[0034] (1) Pour 600 ml of commercially available tetrahydrofuran into a 1000 ml flask, add 15 g of calcium hydride, then stir at room temperature for 24 h, then distill off the solvent at 70°C to obtain anhydrous tetrahydrofuran;

[0035] (2) Weigh 0.150 g of bis(cyclopentadiene) nickel and add it to 10 ml of anhydrous tetrahydrofuran, sonicate for 10 min to fully dissolve the bis(cyclopentadiene) nickel; then transfer the mixture to a 25 ml autoclave placed in an oven at 210°C for 24 hours; after naturally cooling to room temperature, the feed liquid was taken out and washed with absolute ethanol for 5 times; then the reactants were dried in an oven at 60°C for 12 hours;

[0036] (4) Take 0.5 g of dried powder and place it in a tube furnace; heat it up to 320 °C for 2.5 h at a rate of 5 °C / min in an air atmosphere, and then cool naturally to obtain the final NiO@Carbon nanocomposite material.

[0037] From Figure 6 It can be seen that the NiO@Carbon obtained by adding only ...

Embodiment 3

[0039] (1) Pour 600 ml of commercially available tetrahydrofuran into a 1000 ml flask, add 15 g of calcium hydride, then stir at room temperature for 24 h, then distill off the solvent at 70°C to obtain anhydrous tetrahydrofuran;

[0040] (2) The graphene oxide (GO) aqueous dispersion prepared by the improved Hummers method was centrifuged with an anhydrous solvent obtained by adding one step six times to obtain an anhydrous tetrahydrofuran dispersion of GO, and the concentration of GO was 7.5 mg / ml;

[0041] (3) Weigh 0.045 g of bis(cyclopentadiene)nickel and add it to 8 ml of anhydrous tetrahydrofuran, sonicate for 10 min to fully dissolve the bis(cyclopentadiene)nickel; then add 2 ml of anhydrous solvent dispersion of GO , sonicated for 30 min to help disperse; then the mixture was transferred to a 25 ml autoclave, and placed in an oven at 210°C for 24 h; after naturally cooling to room temperature, the material liquid was taken out and washed 5 times by centrifugation with ...

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Abstract

The invention belongs to the technical field of energy storage materials, and particularly discloses a nano composite material of carbon-coated NiO nanosheet-loaded graphene and a preparation method of the nano composite material. The nano composite material of which an amorphous carbon-coated nickel oxide nanosheet uniformly grows on graphene in situ is prepared by a simple one-step solvothermal method. The nano composite material has high specific surface area and porosity, can be used as an anode material of a lithium battery, and shows high energy storage density and good multi-times charge-discharge stability at the current density of 200mA / g; in addition, the composite material can still keep relatively high energy storage density at high current density; and when the current density is restored into a low value, the energy storage density can be restored into a relatively high level. The method disclosed by the invention is simple to operate and relatively low in production cost, and has a good industrial production foundation and a wide application prospect; and massive and large-scale production is easy to achieve.

Description

technical field [0001] The invention belongs to the technical field of energy storage materials, and in particular relates to a lithium battery negative electrode material and a preparation method and application thereof. Background technique [0002] In today's world, the conversion and storage of energy is becoming more and more important. Therefore, people are eager to develop various high-performance energy storage devices to store the generated energy. Among these energy storage devices, lithium-ion batteries, as a rapidly developing energy storage device that can be used to store electrical energy, have received extensive attention due to their high energy storage density, long cycle life, and environmental friendliness. . However, the theoretical capacity of current commercial graphite anode materials is low (372 mAh g -1 ), the rate performance is poor, and it is difficult to meet the increasing demand for energy storage in communication equipment, electric vehicl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/133H01M4/36H01M4/583H01M10/0525
CPCH01M4/133H01M4/366H01M4/583H01M10/0525Y02E60/10
Inventor 王雄伟张泽汇武培怡
Owner FUDAN UNIV
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