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Carbon-cladded sodium ferric pyrophosphate material and preparation method thereof as well application of carbon-cladded sodium ferric pyrophosphate material serving as sodium-ion battery positive electrode material

A carbon-coated sodium iron pyrophosphate and phosphorus source technology, which is applied in nanotechnology for materials and surface science, battery electrodes, positive electrodes, etc., can solve the problems of poor electronic conductivity, difficult control of high-temperature sintered structure, and ion diffusion rate. Slow and other problems, to achieve the effect of improving stability, excellent electrochemical performance, and short ion diffusion path

Inactive Publication Date: 2018-06-05
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In view of the technical defects of the existing sodium iron pyrophosphate materials such as poor electronic conductivity, slow ion diffusion rate, and difficulty in controlling the high-temperature sintered structure, the purpose of the present invention is to provide an orderly nanostructure, and the surface is evenly coated with conductive materials. Carbon layer, carbon-coated sodium iron pyrophosphate material with excellent electrochemical performance

Method used

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  • Carbon-cladded sodium ferric pyrophosphate material and preparation method thereof as well application of carbon-cladded sodium ferric pyrophosphate material serving as sodium-ion battery positive electrode material
  • Carbon-cladded sodium ferric pyrophosphate material and preparation method thereof as well application of carbon-cladded sodium ferric pyrophosphate material serving as sodium-ion battery positive electrode material
  • Carbon-cladded sodium ferric pyrophosphate material and preparation method thereof as well application of carbon-cladded sodium ferric pyrophosphate material serving as sodium-ion battery positive electrode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] Add 2.3236g of ammonium dihydrogen phosphate and 8.6467g of oleic acid into a 501L stainless steel ball mill tank, 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 2 hours to obtain milky white mixture. 11.529 g of sectioned paraffin was added, followed by ball milling for 1 hour. Then 2.216 g of ferrous oxalate dihydrate was added, and ball milling was continued for 1 hour to obtain a yellow viscous mixture. Finally, 1.2926g of anhydrous sodium acetate was added and mixed by ball milling for 2 hours to obtain a viscous uniform mixed precursor. Turn the viscous precursor of sodium ferric pyrophosphate to a H 2 / Ar(Ar and H 2 In a quartz tube furnace with a volume ratio of 95:5), the temperature was raised to 600°C at a rate of 2°C / 1in for calcination at a constant temperature for 12 hours, and the carbon-coated Na 3.12 Fe 2.44 (P 2 o 7 ) 2 powder material. Adop...

Embodiment 2

[0053] Add 2.3236g of ammonium dihydrogen phosphate and 8.6467g of oleic acid into a 501L stainless steel ball mill tank, 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 2 hours to obtain milky white mixture. 11.529 g of sectioned paraffin was added, followed by ball milling for 1 hour. Then 2.216 g of ferrous oxalate dihydrate was added, and ball milling was continued for 1 hour to obtain a yellow viscous mixture. Finally, 1.2926g of anhydrous sodium acetate was added and mixed by ball milling for 2 hours to obtain a viscous uniform mixed precursor. Turn the viscous precursor of sodium ferric pyrophosphate to a H 2 / Ar(Ar and H 2 In a quartz tube furnace with a volume ratio of 95:5), the temperature was raised to 650°C at a rate of 2°C / 1in for calcination at a constant temperature for 12 hours, and the carbon-coated Na 3.12 Fe 2.44 (P 2 o 7 ) 2 powder material. Adop...

Embodiment 3

[0055] Add 2.3236g of ammonium dihydrogen phosphate and 8.6467g of oleic acid into a 501L stainless steel ball mill tank, 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 2 hours to obtain milky white mixture. 11.529 g of sectioned paraffin was added, followed by ball milling for 1 hour. Then 2.216 g of ferrous oxalate dihydrate was added, and ball milling was continued for 1 hour to obtain a yellow viscous mixture. Finally, 1.2926g of anhydrous sodium acetate was added and mixed by ball milling for 2 hours to obtain a viscous uniform mixed precursor. Turn the viscous precursor of sodium ferric pyrophosphate to a H 2 / Ar(Ar and H 2 In a quartz tube furnace with a volume ratio of 95:5), the temperature was raised to 700°C at a rate of 2°C / 1in for calcination at a constant temperature for 12 hours, and the carbon-coated Na 3.12 Fe 2.44 (P 2 o 7 ) 2 powder material. Adop...

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Abstract

The invention discloses a carbon-cladded sodium ferric pyrophosphate material and a preparation method thereof as well application of the carbon-cladded sodium ferric pyrophosphate material serving asa sodium-ion battery positive electrode material. The carbon-cladded sodium ferric pyrophosphate material has an ordered nano-structure and the surface of the material is uniformly cladded with a carbon layer; the preparation method of the carbon-cladded sodium ferric pyrophosphate material comprises the following steps: sequentially carrying out ball milling and mixing on an organic macromolecular surfactant, a phosphorous source, a hydrocarbon type mixture, an iron source and a sodium source to obtain a precursor; putting the precursor into a protective atmosphere and calcining to obtain the carbon-cladded sodium ferric pyrophosphate material. The carbon-cladded sodium ferric pyrophosphate material has the ordered nano-structure and a large contact area with electrolyte; an ion dispersion path is short and an ion dispersion speed in a battery system is effectively improved; an electron transmission speed and the stability of the electrode material are effectively improved through aconductive carbon layer; the carbon-cladded sodium ferric pyrophosphate material is used as the sodium-ion battery positive electrode material and has excellent electrochemical performance, and is anideal sodium-ion battery positive electrode material; a preparation process is simple in technology and low in cost; large-scale production is easy to enlarge and the carbon-cladded sodium ferric pyrophosphate material has a very great application prospect.

Description

technical field [0001] The invention relates to a sodium ion battery positive electrode material, in particular to a carbon-coated sodium iron pyrophosphate 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] In today's world, with the environmental pollution caused by the burning of fossil fuels and global warming becoming more and more serious, all countries are transforming the economic model based on fossil fuels to an economic model based on new energy, and developing renewable energy and clean energy. It is a major strategic task of my country's economic and social development. With the rapid development of society, there is an imminent demand for high-security and low-cost energy storage technology. Lithium-ion batteries are considered to be one of the most promising energy storage technologies to meet these dem...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/054B82Y30/00
CPCB82Y30/00H01M4/366H01M4/5825H01M4/625H01M10/054H01M2004/021H01M2004/028Y02E60/10
Inventor 潘安强曹鑫鑫梁叔全周江
Owner CENT SOUTH UNIV
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