Graphene carbon-coated sodium vanadium phosphate material, preparation method thereof and application method of sodium vanadium phosphate material used as sodium ion battery positive electrode material

A technology of carbon-coated sodium vanadium phosphate and sodium vanadium phosphate, which is applied in battery electrodes, circuits, electrical components, etc., can solve the problems of difficult control of high-temperature sintered structure, slow ion diffusion rate, poor electronic conductivity, etc., and achieve ion diffusion Short path, excellent electrochemical performance, and good crystallinity

Inactive Publication Date: 2018-06-15
CENT SOUTH UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In view of the technical defects such as poor electronic conductivity, slow ion diffusion rate, and difficult control of high-temperature sintered structure in existing polyanion electrode materials and carbon-coated sodium vanadium phosphate materials, the first purpose of the present invention is to provide a crystal A graphene-like carbon-coated sodium vanadium phosphate material with good properties, uniform nanometer size, complete graphene-like carbon coating, and excellent electrochemical performance

Method used

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  • Graphene carbon-coated sodium vanadium phosphate material, preparation method thereof and application method of sodium vanadium phosphate material used as sodium ion battery positive electrode material
  • Graphene carbon-coated sodium vanadium phosphate material, preparation method thereof and application method of sodium vanadium phosphate material used as sodium ion battery positive electrode material
  • Graphene carbon-coated sodium vanadium phosphate material, preparation method thereof and application method of sodium vanadium phosphate material used as sodium ion battery positive electrode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] Add 2.0913g of ammonium dihydrogen phosphate and 5.188g of oleic acid into a 50ml stainless steel ball mill jar, add 20 304 stainless steel balls each with a diameter of 2mm and 4mm as the ball milling medium, and use a high-energy mechanical ball mill to mix for 3 hours to obtain milky white mixture. 10.376 g of paraffin wax was added, followed by ball milling for 2 hours. Then 2.184 g of vanadium oxalate was added, and ball milling was continued for 2 hours to obtain a viscous mixture. Finally, 1.566 g of anhydrous sodium acetate was added and ball milled for 3 hours to obtain a solid or semi-liquid sodium vanadium phosphate precursor. Turn the sodium vanadium phosphate precursor to a H 2 1Ar (Ar and H 2 In a quartz tube furnace with a volume ratio of 95:5) mixed gases, the heating rate was raised to 800°C for 8h at a heating rate of 2°C for 1min, and the furnace was cooled to obtain a graphene-like carbon-coated sodium vanadium phosphate material. The crystal str...

Embodiment 2

[0052] Add 2.0913g of ammonium dihydrogen phosphate and 7.782g of oleic acid into a 50ml stainless steel ball mill jar, add 20 304 stainless steel balls each with a diameter of 2 mm and 4 mm as the ball milling medium, and use a high-energy mechanical ball mill to mix for 3 hours to obtain milky white mixture. 10.376 g of paraffin wax was added, followed by ball milling for 2 hours. Then 2.184 g of vanadium oxalate was added, and ball milling was continued for 2 hours to obtain a viscous mixture. Finally, 1.566 g of anhydrous sodium acetate was added and ball milled for 3 hours to obtain a solid or semi-liquid sodium vanadium phosphate precursor. Turn the sodium vanadium phosphate precursor to a H 2 1Ar (Ar and H 2 In a quartz tube furnace with a volume ratio of 95:5) mixed gases, the heating rate was raised to 800°C for 8h at a heating rate of 2°C for 1min, and the furnace was cooled to obtain a graphene-like carbon-coated sodium vanadium phosphate material.

Embodiment 3

[0054] Add 3.4855g of ammonium dihydrogen phosphate and 8.559g of oleic acid into a 50ml stainless steel ball mill jar, add 20 304 stainless steel balls each with a diameter of 2mm and 4mm as the ball milling medium, and use a high-energy mechanical ball mill to mix for 3 hours to obtain milky white mixture. 17.118 g of paraffin wax was added, followed by ball milling for 2 hours. Then 3.64 g of vanadium oxalate was added, and ball milling was continued for 2 hours to obtain a viscous mixture. Finally, 2.61 g of anhydrous sodium acetate was added and ball milled for 3 hours to obtain a solid or semi-liquid sodium vanadium phosphate precursor. Turn the sodium vanadium phosphate precursor to a H 2 1Ar (Ar and H 2 In a quartz tube furnace with a volume ratio of 95:5) mixed gases, the heating rate was raised to 800°C for 8h at a heating rate of 2°C for 1min, and the furnace was cooled to obtain a graphene-like carbon-coated sodium vanadium phosphate material.

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Abstract

The invention discloses a graphene carbon-coated sodium vanadium phosphate material, a preparation method thereof and an application method of the sodium vanadium phosphate material used as a sodium ion battery positive electrode material. The graphene carbon-coated sodium vanadium phosphate material is formed by uniformly coating a two-dimensional nanometer sheet-shaped sodium vanadium phosphatecrystal with a graphene carbon layer. The preparation method of the graphene carbon-coated sodium vanadium phosphate material comprises the steps of sequentially ball-grinding and mixing an anionic surfactant, a phosphorus source, a hydrocarbon mixture, a vanadium source and a sodium source to obtain a sodium vanadium phosphate precursor; and placing the sodium vanadium phosphate precursor in a protection atmosphere for calcination, thereby obtaining the graphene carbon-coated sodium vanadium phosphate material having good crystallinity, uniform nanometer size and excellent electrochemical performance and completely coated with graphene carbon. When the graphene carbon-coated sodium vanadium phosphate material is used as a sodium ion positive electrode material, the sodium ion battery shows excellent cycle property and rate performance; and the preparation process of the graphene carbon-coated sodium vanadium phosphate material is simple and is low in cost, and mass production is easyto amplify.

Description

technical field [0001] The invention relates to a sodium ion battery positive electrode material, in particular to a graphene-like carbon-coated sodium vanadium phosphate material, a preparation method thereof, and an application as a sodium ion battery positive electrode material; it belongs to the technical field of sodium ion battery preparation. Background technique [0002] With the continuous development and utilization of renewable energy such as solar energy, wind energy, and tidal energy, it is urgent to develop effective electrical energy storage methods. Lithium-ion batteries occupy a dominant position in the field of energy storage due to their high energy density, high energy conversion efficiency, and long cycle life. However, due to the limited reserves and rising prices of lithium resources, its large-scale application is limited. Many researchers in the scientific and industrial circles are looking for alternative technologies to lithium-ion batteries. Na-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M4/62
CPCH01M4/5825H01M4/625Y02E60/10
Inventor 梁叔全曹鑫鑫潘安强周江
Owner CENT SOUTH UNIV
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