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Carbon-doped nitrogen-coated tin oxide/iron oxide composite material, preparation method thereof, and lithium battery material

A composite material and nitrogen doping technology, which is applied in the field of lithium battery material preparation, can solve the problems of reducing energy density, difficult production conditions, and unstable volume formation of SEI film, etc., and achieves high chemical reaction activity and good reversibility of charge-discharge reaction. Effect

Active Publication Date: 2018-09-28
HUBEI ENG UNIV
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Problems solved by technology

[0002] SnO 2 It is a semiconductor material with high specific capacity, wide source of materials, non-toxic, non-polluting and easy to make, which has been widely used in lithium-ion battery anode materials in recent years, but SnO 2 During the charge and discharge process, there will be a huge volume expansion, which will make it pulverize, agglomerate and form an unstable SEI film, resulting in a rapid decline in specific capacity.
At present, technicians are taking measures to modify it. Most of the methods are to nano-synthesize nanowires and nanotubes to increase the surface area of ​​tin dioxide, or to synthesize hollow-structured spheres and cubes to alleviate the volume. expansion, but its production conditions are difficult and its energy density is greatly reduced

Method used

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  • Carbon-doped nitrogen-coated tin oxide/iron oxide composite material, preparation method thereof, and lithium battery material
  • Carbon-doped nitrogen-coated tin oxide/iron oxide composite material, preparation method thereof, and lithium battery material
  • Carbon-doped nitrogen-coated tin oxide/iron oxide composite material, preparation method thereof, and lithium battery material

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[0031] According to the first aspect of the present invention, a method for preparing a carbon-doped nitrogen-coated tin oxide / iron oxide composite material is provided, comprising: dissolving binary lithium salt in anhydrous alcohol solution; adding iron salt and tin salt In the above solution; after 10-60 minutes, add the nitrogen source and carbon source into the solution; dry the above solution to obtain a solid; roast the solid to obtain a powder; wash the powder with water and centrifuge; dry the centrifuged solid to obtain a red color Solid powder; the red powder is roasted in a protective gas to obtain a carbon-doped nitrogen-coated tin oxide / iron oxide composite material.

[0032] Preferably, the binary lithium salt is two kinds of low melting point lithium salts;

[0033] Preferably, the binary lithium salt includes two of lithium bromide, lithium chloride, lithium nitrate and lithium acetate; more preferably, the binary lithium in the embodiment of the present inven...

Embodiment 1

[0049] In this method, lithium chloride and lithium nitrate are dissolved in absolute ethanol with a volume of 40 parts by mass of lithium nitrate at a ratio of 3:1, and anhydrous ferric chloride and tin tetrachloride are added to the above solution at a mass ratio of 40:1. , after stirring for 30 minutes, add urea and citric acid into the above solution according to the mass ratio of 1:1 and continue to stir thoroughly, then put the above solution in an oven to dry at 70°C for 24h, and then calcinate in air at 250°C for 4h, take out The product was washed with water and centrifuged three times, and the centrifuged solid was dried at 50°C and cooled to room temperature to obtain the primary product powder. Iron oxide composite electrode material.

Embodiment 2

[0051] In this method, lithium chloride and lithium nitrate are dissolved in absolute ethanol with a volume of 45 parts by mass of lithium nitrate at a ratio of 2:1, and anhydrous ferric chloride and tin tetrachloride are added to the above solution at a mass ratio of 40:2. , after stirring for 30 minutes, add urea and citric acid into the above solution according to the mass ratio of 2:1 and continue to stir fully, then put the above solution in an oven to dry at 75°C for 24h, then calcinate in air at 270°C for 3h, take out The product was washed with water and centrifuged three times, and the centrifuged solid was dried at 55°C and cooled to room temperature to obtain the primary product powder, and then the powder was put into nitrogen and roasted at 540°C for 3 hours to obtain carbon-doped nitrogen-coated tin oxide / Iron oxide composite electrode material.

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Abstract

The invention provides a carbon-doped nitrogen-coated tin oxide / iron oxide composite material, a preparation method thereof, and lithium battery material, relating to the technical field of preparation of lithium battery material, comprising the steps of: dissolving binary lithium salt in an anhydrous alcohol solution; adding salt and tin salt to the above solution; adding a nitrogen source and acarbon source to the solution after 10 to 60 minutes; drying the solution to obtain a solid; calcining the solid to obtain a powder; washing and centrifuging the powder; drying the solid obtained by centrifugation to obtain a red solid powder; and calcining the red powder in a protective gas to obtain a carbon-doped nitrogen-coated tin oxide / iron oxide composite material. By using the binary lithium with lower boiling point as the molten salt reagent, the low-boiling molten salt can be used as a high-strength solvent during the reaction process to increase the ion diffusion rate, accelerate the formation of SnO2 and Fe2O3, and control the growth of product grains. After calcination, nitrogen atoms are introduced into the carbon layer to form structural defects, which facilitates rapid deintercalation of lithium ions and improves the charge and discharge rate and stability of the material.

Description

technical field [0001] The invention relates to the technical field of preparation of lithium battery materials, in particular to a carbon-doped nitrogen-coated tin oxide / iron oxide composite material, a preparation method thereof, and a lithium battery material. Background technique [0002] SnO 2 It is a semiconductor material with high specific capacity, wide source of materials, non-toxic, non-polluting and easy to make, which has been widely used in lithium-ion battery anode materials in recent years, but SnO 2 During the charging and discharging process, the huge volume expansion will cause pulverization, agglomeration and the formation of unstable SEI film, resulting in rapid loss of specific capacity. At present, technicians are taking measures to modify it. Most of the methods are to nano-synthesize nanowires and nanotubes to increase the surface area of ​​tin dioxide, or to synthesize hollow-structured spheres and cubes to alleviate the volume. Expansion, but its...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/525H01M4/62H01M10/0525
CPCH01M4/366H01M4/485H01M4/525H01M4/62H01M4/625H01M10/0525Y02E60/10
Inventor 付争兵李月庆蒋纯金刘权王锋丁瑜杜军杨雄
Owner HUBEI ENG UNIV
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