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Three-dimensional macroporous graphene, carbon nano tube and molybdenum disulfide composite material, and preparation method and application of composite material

A technology of three-dimensional macropores and carbon nanotubes, which is applied to electrical components, battery electrodes, circuits, etc., can solve the problems of poor stability and low first-time cycle efficiency, and achieve good stability, high lattice integrity, and ease of expansion. Effect

Active Publication Date: 2015-08-12
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The present invention solves the problems of poor stability and low initial cycle efficiency of existing molybdenum disulfide as the negative electrode active material of lithium ion batteries, and provides a three-dimensional macroporous graphene-carbon nanotube-molybdenum disulfide composite material and its preparation Methods and Applications

Method used

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  • Three-dimensional macroporous graphene, carbon nano tube and molybdenum disulfide composite material, and preparation method and application of composite material
  • Three-dimensional macroporous graphene, carbon nano tube and molybdenum disulfide composite material, and preparation method and application of composite material
  • Three-dimensional macroporous graphene, carbon nano tube and molybdenum disulfide composite material, and preparation method and application of composite material

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specific Embodiment approach 1

[0035] Specific embodiment 1: A three-dimensional macroporous graphene-carbon nanotube-molybdenum disulfide composite material described in this embodiment is obtained by pretreatment and chemical vapor deposition of metal foam with a pore diameter of 0.1 mm to 5 mm. Porous graphene / foamed metal composite, then place the three-dimensional macroporous graphene / foamed metal composite in an aqueous solution of nickel nitrate and cobalt chloride, dry, and chemical vapor deposition to obtain a three-dimensional macroporous graphene / carbon nanotube / Foamed metal composites, immersing the three-dimensional macroporous graphene / carbon nanotubes / foamed metal composites in the etching solution to obtain three-dimensional macroporous graphene / carbon nanotubes. Molybdenum disulfide is loaded on the nanotubes to obtain three-dimensional macroporous graphene / carbon nanotubes loaded with molybdenum disulfide, and finally the three-dimensional macroporous graphene / carbon nanotubes loaded with ...

specific Embodiment approach 2

[0040] Embodiment 2: The difference between this embodiment and Embodiment 1 is that the metal foam with a pore size of 0.1 mm to 5 mm is pretreated and chemical vapor deposited to obtain a three-dimensional macroporous graphene / metal foam composite. It is carried out according to the following steps: the metal foam with a pore diameter of 0.1 mm to 5 mm is immersed in acetone for 3 min to 15 min, ethanol for 3 min to 15 min, and hydrochloric acid with a mass percentage of 1% to 5% for 3 min to 7 min to obtain the base material. Then place the base material in a chemical vapor deposition device, pass through carbon source gas and carrier gas, and deposit at a temperature of 850°C to 1100°C for 4min to 15min to obtain a three-dimensional macroporous graphene / foam metal composite;

[0041] The total gas flow of the carbon source gas and carrier gas is 20 sccm to 800 sccm; the carbon source gas is methane, and the gas flow of methane is 0.5 sccm to 20 sccm; the carrier gas is a mi...

specific Embodiment approach 3

[0042] Specific embodiment three: the difference between this embodiment and specific embodiment one or two is: the described three-dimensional macroporous graphene / foam metal composite is placed in the aqueous solution of nickel nitrate and cobalt chloride, dried, and then Chemical vapor deposition to obtain a three-dimensional macroporous graphene / carbon nanotube / foam metal composite, specifically as follows: ① Dissolve nickel nitrate and cobalt chloride in deionized water to obtain nickel nitrate and cobalt chloride immerse the three-dimensional macroporous graphene / foam metal composite in the aqueous solution of nickel nitrate and cobalt chloride for 30min to 60min, then take it out and dry it on a hot plate at a temperature of 30°C to 50°C; ②, repeat Step 2 ① 5 to 10 times to obtain the impregnated composite material; ③, place the impregnated composite material in a chemical vapor deposition device at a temperature of 600°C to 850°C at a rate of 4.5mL / min to 5.5mL / The ra...

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Abstract

The invention discloses a three-dimensional macroporous graphene, carbon nano tube and molybdenum disulfide composite material, and a preparation method and an application of the composite material, and relates to a nano composite material, and a preparation method and an application of the nano composite material. The composite material, the preparation method and the application aim at solving the problems of poor stability and too low first cycle efficiency of existing molybdenum disulfide serving as a cathode active substance of a lithium ion battery. The method comprises the steps of 1, preparing a three-dimensional macroporous graphene / foam metal composite, 2, preparing a three-dimensional macroporous graphene / carbon nano tube / foam metal composite, 3, preparing a three-dimensional macroporous graphene / carbon nano tube, 4, loading molybdenum disulfide by a hydrothermal method, and 5, annealing the three-dimensional macroporous graphene / carbon nano tube loaded with molybdenum disulfide to obtain the three-dimensional macroporous graphene, carbon nano tube and molybdenum disulfide composite material.

Description

technical field [0001] The invention relates to a nanocomposite material and its preparation method and application. Background technique [0002] Molybdenum disulfide (MoS 2 ) has a layered structure similar to graphite and belongs to the hexagonal crystal system. It has a strong covalent bond in the layer, and a weak van der Waals force between the layers. Lithium ions can be deintercalated between the layers. A negative active material for lithium-ion batteries with excellent performance. Molybdenum disulfide, the anode active material for lithium-ion batteries, has a theoretical capacity of 667mAh / g, which is twice that of the currently used graphite anode. Due to the reversible recombination reaction between sulfur atoms and lithium ions, its actual capacity is often greater than the theoretical capacity. [0003] The biggest obstacle hindering the application of molybdenum disulfide in lithium-ion battery anode materials is poor stability. The electrode capacity prep...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/136H01M4/1397
CPCH01M4/136H01M4/1397H01M4/62Y02E60/10
Inventor 赵九蓬马晓轩李垚郝建张坤
Owner HARBIN INST OF TECH
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