Fluorinated phosphate sodium iron pyrophosphate@c@rgo composite material and its preparation and application in sodium-ion batteries

A technology of fluorinated sodium ferric phosphate pyrophosphate and fluorinated sodium ferric phosphate pyrophosphate, which is applied in the field of sodium ion battery materials, can solve problems affecting practical applications, improve capacity performance, improve thermal stability and chemical stability, and improve The effect of cycle stability

Active Publication Date: 2020-12-25
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, the phase transition problem of phosphate iron-based materials has affected its practical application.

Method used

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  • Fluorinated phosphate sodium iron pyrophosphate@c@rgo composite material and its preparation and application in sodium-ion batteries
  • Fluorinated phosphate sodium iron pyrophosphate@c@rgo composite material and its preparation and application in sodium-ion batteries

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] First take 0.015mol ferric nitrate nonahydrate, 0.015mol ammonium dihydrogen phosphate, 0.02mol anhydrous sodium carbonate, 0.015mol ammonium fluoride and 0.03mol (molar ratio to iron 2:1) of ascorbic acid, and then weigh 0.15g of RGO ( Equivalent to 5% of the theoretical active substance), dissolved in deionized water, and adjusted to pH 3 to 4 by sulfurous acid. Evaporated water at 80 degrees, dried in vacuum at 100 degrees for 4 hours, and put the powder into a porcelain boat. Under an atmosphere of argon, 550 ℃ sintering 12h. i.e. get Na 4 Fe 3 PO 4 P 2 o 7 f 3 @C@RGO. See XRD diagram figure 1 , a material with high crystal phase purity was obtained. see SEM figure 2 .

[0063] The sodium ion battery composite positive electrode material prepared in this example is assembled into a button battery with sodium sheets, and the voltage of the material can reach 3.6V; at 1C rate, the discharge specific capacity reaches 95mAh / g after 100 cycles, and the capacit...

Embodiment 2

[0065] First take 0.015mol ferric nitrate nonahydrate, 0.015mol ammonium dihydrogen phosphate, 0.02mol anhydrous sodium carbonate, 0.015mol ammonium fluoride and 0.045mol (molar ratio to iron 3:1) ascorbic acid, then weigh 0.15g of RGO , dissolved in deionized water, and adjusted to pH 3-4 with sulfurous acid. Evaporate water at 80°C, dry in vacuum at 100°C for 4 hours, put the powder into a porcelain boat, and sinter at 550°C for 12 hours in an argon atmosphere. i.e. get Na 4 Fe 3 PO 4 P 2 o 7 f 3 @C@RGO.

[0066] The sodium-ion battery composite positive electrode material prepared in this example and the sodium sheet were assembled into a button battery. Under the rate of 1C, the discharge specific capacity reached 92mAh / g after 100 cycles, and the capacity retention rate reached more than 90%.

Embodiment 3

[0068] First take 0.015mol ferric nitrate nonahydrate, 0.015mol ammonium dihydrogen phosphate, 0.02mol anhydrous sodium carbonate, 0.015mol ammonium fluoride and 0.03mol (molar ratio to iron 2:1) of ascorbic acid, and then weigh 0.15g of RGO , dissolved in deionized water, and adjusted to pH 3-4 with sulfurous acid. Evaporate water at 80°C, dry in vacuum at 100°C for 4 hours, put the powder into a porcelain boat, and sinter at 650°C for 16 hours in an argon atmosphere. i.e. get Na 4 Fe 3 PO 4 P 2 o 7 f 3 @C@RGO.

[0069] The sodium-ion battery composite positive electrode material prepared in this example and the sodium sheet were assembled into a button battery. Under the rate of 1C, the discharge specific capacity reached 87mAh / g after 100 cycles, and the capacity retention rate reached more than 90%.

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Abstract

The invention belongs to the field of electrode materials for sodium ion batteries, and specifically discloses a ferric sodium pyrophosphate phosphorus fluoride@C@RGO composite material. The compositematerial includes reduced graphene oxide and active particles compounded in situ on the surface of the reduced graphene oxide. The active particles are ferric sodium pyrophosphate phosphorus fluoride, and the chemical formula of the ferric sodium pyrophosphate phosphorus fluoride is Na4Fe3PO4P2O7F3. The invention also provides a preparation method and an application of the material. The materialhas the characteristics of high theoretical quantity, high voltage, stable cycling and low cost of raw materials, and has a good prospect of industrialization. It is discovered from the invention that, through the novel active ingredient and the innovative double-carbon in-situ composite morphology, the technical problems of phase transition, poor stability and poor electrical performance of the existing iron-based cathode material can be solved, and the voltage, capacity, rate and cycle stability of the material can be improved.

Description

technical field [0001] The invention relates to the field of sodium ion battery materials, in particular to positive electrode active materials for sodium ion batteries. 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 pure energy. Therefore, the research on sodium-ion batteries has become a hot spot nowadays, and sodium-ion batteries are considered to be an ideal technology for large-scale power storage applications 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 for electrode materials. For example, sodium ions are about 55%...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/054H01M4/136
CPCH01M4/136H01M4/362H01M4/5825H01M4/625H01M4/628H01M10/054H01M2004/028Y02E60/10
Inventor 张治安赖延清孙学文王涛胜洪波张凯李劼
Owner 湖南钠邦新能源有限公司
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