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Carbon-coated vanadium pentoxide positive electrode material as well as preparation method thereof and application of carbon-coated vanadium pentoxide positive electrode material in lithium battery

A carbon-coated technology of vanadium pentoxide and vanadium pentoxide, applied in secondary batteries, battery electrodes, circuits, etc., can solve the problems of small lithium ion diffusion coefficient, poor cycle stability, unstable structure, etc. Electrical conductivity and structural stability, improving electrical conductivity, the effect of increasing electrical conductivity

Inactive Publication Date: 2019-05-28
ZHUHAI COSMX BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] One of the purposes of the present invention is to solve V 2 o 5 Lithium ion diffusion coefficient is small, the structure is unstable, the cycle stability is poor, and the electrical conductivity is poor. The invention provides a carbon-coated vanadium pentoxide positive electrode material and a preparation method, which is used on a graphene foam substrate On-growth 3D VS 2 nanosheet structure, and then annealed in air to grow V with a three-dimensional structure 2 o 5 nanosheets, further self-aggregated dopamine in the prepared V 2 o 5 material surface, and then high-temperature annealing can obtain carbon-coated vanadium pentoxide cathode material

Method used

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  • Carbon-coated vanadium pentoxide positive electrode material as well as preparation method thereof and application of carbon-coated vanadium pentoxide positive electrode material in lithium battery
  • Carbon-coated vanadium pentoxide positive electrode material as well as preparation method thereof and application of carbon-coated vanadium pentoxide positive electrode material in lithium battery

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specific Embodiment approach 1

[0023] A carbon-coated vanadium pentoxide positive electrode material, the positive electrode material has a sandwich structure, the outer cladding layer of the sandwich structure is a nitrogen-doped carbon material, and the inner sandwich material of the sandwich structure is graphene foam and Vanadium pentoxide, the vanadium pentoxide grows on the surface of the graphene foam.

[0024] Further, the carbon content of the positive electrode material is 10-50 wt%, the content of nitrogen element is 0.01-5 wt%, the content of vanadium element is 5-50 wt%, and the rest is oxygen element content.

[0025] The invention provides a method for preparing a carbon-coated vanadium pentoxide positive electrode material. VS is grown on a conductive three-dimensional porous graphene foam substrate. 2 precursor, the active V 2 o 5 , and then coat the dopamine in the active substance V 2 o 5 surface, through further high-temperature carbonization, carbon-coated V 2 o 5 Cathode material...

Embodiment 1

[0032] (1) Put 2 mg of three-dimensional porous graphene foam substrate in a mixed solution of thioacetamide with a concentration of 20 mg / ml and ammonium metavanadate with a concentration of 30 mg / ml, and conduct a hydrothermal reaction at 180°C for 24 h to obtain Graphene foam grown with vanadium disulfide having a three-dimensional nanosheet structure;

[0033] (2) In growth there is VS 2 The graphene foam of the nanosheet is placed in a tube furnace, annealed in air at 100° C. for 5 h to obtain a graphene foam growing with vanadium pentoxide, and the vanadium pentoxide has a three-dimensional nanosheet structure;

[0034] (3) Grind the graphene foam grown with vanadium pentoxide into powder particles with a particle size of 5-50 μm, put them in a 1 mg / ml dopamine hydrochloride-Tris mixed solution, and self-polymerize at 10°C for 48 h Film-forming polydopamine, loaded at V 2 o 5 On the surface, the thickness of the polydopamine is 5-10 μm;

[0035] (4) Centrifuge the po...

Embodiment 2

[0038] (1) Put 20 mg of three-dimensional porous graphene foam substrate in a mixed solution with a concentration of 50 mg / ml thioacetamide and a concentration of ammonium metavanadate of 60 mg / ml, and undergo a hydrothermal reaction at 120°C for 12 h to obtain growth organic Graphene foam of vanadium disulfide having a three-dimensional nanosheet structure;

[0039] (2) In growth there is VS 2 The graphene foam of the nanosheet is placed in a tube furnace, and annealed at 400°C for 1 h in the air to obtain a graphene foam with vanadium pentoxide, the vanadium pentoxide has a three-dimensional nanosheet structure;

[0040] (3) Grind the graphene foam with vanadium pentoxide grown on the surface into a powder particle with a particle size of 5-50 μm, then place it in a 5 mg / ml dopamine hydrochloride-Tris mixed solution, and self-polymerize at 35°C 10 h film formation polydopamine, loaded at V 2 o 5 On the surface, the polydopamine has a thickness of 5-10 μm;

[0041] (4) Ce...

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Abstract

The invention provides a carbon-coated vanadium pentoxide positive electrode material, a preparation method thereof and application of the carbon-coated vanadium pentoxide positive electrode materialin a lithium battery, and belongs to the technical field of lithium batteries. The specific scheme is as follows: the carbon-coated vanadium pentoxide positive electrode material has a sandwich structure, an outer coating layer of the sandwich structure is a nitrogen-doped carbon material, an inner sandwich layer of the sandwich structure is graphene foam and vanadium pentoxide, and the preparation method comprises the following steps: (1) performing hydrothermal growth of vanadium disulfide in the graphene foam, and annealing in air; (2) self-polymerizing dopamine on the annealed graphene foam, carrying out centrifugal drying, and carrying out high-temperature annealing in an inert atmosphere; and (3) assembling the annealed material in the inert atmosphere into the lithium battery. According to the prepared vanadium pentoxide positive electrode material with the carbon-coated structure, the loading capacity of the active material is increased through the porous graphene foam, the lithium ion transport distance is shortened, the structural stability of the active material is stabilized through carbon coating, and therefore the prepared vanadium pentoxide positive electrode material shows good electrochemical performance.

Description

technical field [0001] The invention belongs to the technical field of lithium batteries, and in particular relates to a carbon-coated vanadium pentoxide cathode material, a preparation method thereof and an application in lithium batteries. Background technique [0002] As power vehicles have attracted widespread attention from all over the world, people's pursuit of energy storage for driving power vehicles is getting higher and higher. Under the premise of ensuring safety, people are always trying to improve the endurance of power vehicles and reduce production costs. Lithium battery-powered vehicles have been widely used in real life and become a tool for people to travel instead of transportation. [0003] Among the many technologies restricting the development of lithium-ion battery-powered vehicles, the cathode material is often the bottleneck restricting the long battery life. In the market, large passenger cars mainly use lithium iron phosphate cathode materials, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/62H01M10/0525B82Y40/00
CPCY02E60/10
Inventor 袁号李素丽赵伟唐伟超李俊义徐延铭
Owner ZHUHAI COSMX BATTERY CO LTD
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