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A fluorine-doped carbon-coated sodium ferric phosphate pyrophosphate@mesoporous carbon composite material and its preparation and application in sodium-ion batteries

A technology of sodium ferric phosphate pyrophosphate and composite materials, which is applied in battery electrodes, secondary batteries, circuits, etc. It can solve problems affecting applications, poor electrical performance of materials, cumbersome preparation, etc., and achieve high-capacity performance and increase heat Stability and chemical stability, effect of improving cycle performance

Active Publication Date: 2020-11-24
湖南钠邦新能源有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the phase transition problem of phosphate iron-based materials, its application in sodium-ion batteries has been affected.
Not only that, the preparation of iron-based systems for sodium-ion batteries is cumbersome, and the electrical properties of the materials, especially the cycle performance, are poor.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0064] First take 0.015mol ferric nitrate nonahydrate, 0.02mol ammonium dihydrogen phosphate, 0.02mol anhydrous sodium carbonate and 0.86g (mass ratio of iron to iron source 1:1) PVDF, add 5% of the mass of sodium ferric phosphate pyrophosphate Put the CMK-3 into a polytetrafluoroethylene ball mill jar, add zirconia ball mill beads, and mill at 600r / min for 18h to obtain a solid powder. Place the solid powder in an atmosphere tube furnace with a hydrogen-argon mixture (hydrogen content 5%), and sinter at 550°C for 10 hours. The solid product obtained is a new type of sodium ferric phosphate pyrophosphate coated with fluorine-doped carbon with a high specific surface area. @CMK-3 Composite. The particle size of the composite material prepared in this case is 100-600nm; the specific surface area is 712m 2 / g.

[0065] The sodium ion battery composite cathode material prepared in this example and the sodium sheet were assembled into a button battery. Under 1C rate, the discharg...

Embodiment 2

[0067] Compared with Example 1, the difference is only that the amount of PVDF is halved, as follows:

[0068] First take 0.015mol ferric nitrate nonahydrate, 0.02mol ammonium dihydrogen phosphate, 0.02mol anhydrous sodium carbonate and 0.43g (mass ratio of iron to iron source 1:2) PVDF, add 5% of the mass of sodium ferric phosphate pyrophosphate Put the CMK-3 into a polytetrafluoroethylene ball mill jar, add zirconia ball mill beads, and mill at 600r / min for 18h to obtain a solid powder. Place the solid powder in an atmosphere tube furnace with a hydrogen-argon mixture (hydrogen content 5%), and sinter at 550°C for 10 hours. The solid product obtained is a new type of sodium ferric phosphate pyrophosphate coated with fluorine-doped carbon with a high specific surface area. @CMK-3 Composite. The particle size of the composite material prepared in this case is 100-700nm; the specific surface area is 642.

[0069] The composite cathode material for sodium ion battery prepared ...

Embodiment 3

[0071] Compared with Example 1, the only difference is that the amount of CMK-3 is increased, as follows:

[0072] First take 0.015mol ferric nitrate nonahydrate, 0.02mol ammonium dihydrogen phosphate, 0.02mol anhydrous sodium carbonate and 0.86g (mass ratio of iron to iron source 1:1) PVDF, add 10% of the mass of sodium ferric phosphate pyrophosphate Put the CMK-3 into a polytetrafluoroethylene ball mill jar, add zirconia ball mill beads, and mill at 600r / min for 18h to obtain a solid powder. Place the solid powder in an atmosphere tube furnace with a hydrogen-argon mixture (hydrogen content 5%), and sinter at 550°C for 10 hours. The solid product obtained is a new type of sodium ferric phosphate pyrophosphate coated with fluorine-doped carbon with a high specific surface area. @CMK-3 Composite. The particle size of the composite material prepared in this case is 100-700nm; the specific surface area is 612m 2 / g.

[0073] The composite cathode material for sodium ion batte...

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Abstract

The invention belongs to the technical field of sodium ion batteries, and specifically discloses a fluorine-doped carbon-coated phosphate ferric sodium pyrophosphate @ mesoporous carbon composite material. The material comprises mesoporous carbon and fluorine-doped carbon-coated phosphate ferric sodium pyrophosphate dispersed in the mesoporous carbon in situ. The invention also discloses a preparation of the material and an application of the material as an active material for a sodium ion battery. The composite material of the invention has the characteristics of high specific capacity, highsafety and high rate as a positive electrode material of a sodium ion battery, and has rich system resources, low cost, a simple preparation method and a good application prospect.

Description

technical field [0001] The invention relates to a positive electrode material for a sodium ion battery, in particular to a sodium ferric phosphate pyrophosphate@mesoporous carbon composite material coated with fluorine-doped carbon. Background technique [0002] Lithium-ion batteries have achieved great success in the past two decades due to their advantages such as high energy density, high stability, and long life. However, lithium resources are low in the earth's crust and cannot become the key to large-scale energy storage. Therefore, sodium-ion batteries have become a hot spot in research and development, and sodium-ion batteries are considered to be an ideal large-scale power storage application technology due to their abundant sodium resources and environmental friendliness. [0003] Although sodium-ion batteries and lithium-ion batteries are only different in intercalating ions on the surface, they belong to different fields and have completely different requirements...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/054
CPCH01M4/366H01M4/5825H01M4/625H01M10/054H01M2004/021H01M2004/028Y02E60/10
Inventor 张治安孙学文赖延清王涛胜张凯洪波李劼
Owner 湖南钠邦新能源有限公司
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