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A kind of sodium zirconium manganese fluoride phosphate/carbon composite material, positive electrode material, positive electrode and sodium ion battery and preparation method thereof

A technology of fluorinated sodium zirconium manganese phosphate and sodium zirconium manganese phosphate, which is applied in the field of sodium ion battery materials, can solve the problem of poor specific capacity, kinetic performance and cycle performance of electrode materials, lagging technology maturity, and difficulties in intercalation and diffusion and other issues, to achieve the effects of rapid migration, improved electrical properties, and excellent electrochemical properties

Active Publication Date: 2020-08-14
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

For example, sodium ions are about 55% larger than lithium ions, and the intercalation and diffusion of sodium ions in materials with the same structure are often relatively difficult. and cycle performance are correspondingly worse
Compared with the field of lithium-ion batteries, there are still many technical difficulties to be overcome in the field of sodium-ion batteries, and its technical maturity lags behind that of lithium-ion batteries.

Method used

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  • A kind of sodium zirconium manganese fluoride phosphate/carbon composite material, positive electrode material, positive electrode and sodium ion battery and preparation method thereof
  • A kind of sodium zirconium manganese fluoride phosphate/carbon composite material, positive electrode material, positive electrode and sodium ion battery and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0071] Take 0.01mol zirconium oxynitrate, 0.01mol manganese acetate, 0.02mol ammonium dihydrogen phosphate dissolved in deionized water, stir and evaporate at 80 degrees to form a gel, put the gel in a vacuum oven at 80 degrees to dry 4h, and then put it into a tube furnace with argon gas, and sinter at 750 degrees for 10h. To obtain the intermediate zirconium manganese phosphate, mix the zirconium manganese phosphate intermediate with sodium fluoride at a molar ratio of 1:3, and add 0.03 mol of citric acid. Ball milling at 500r / min for 8h, sintering at 700°C for 12h under argon gas. Get Na 3 ZrMn(PO 4 ) 2 f 3 / C,xrd as figure 1 , sem, figure 2 .

[0072] Utilize the prepared Na 3 ZrMn(PO 4 ) 2 f 3 / C composite material, assembled into a sodium ion button battery, the measured electrochemical data has an average voltage of 4.0V, and after 100 cycles at 0.5C, the discharge specific capacity reaches 90.5mAh / g, and the capacity retention rate reaches more than 95%. ....

Embodiment 2

[0074] Take 0.01mol zirconium oxynitrate, 0.01mol manganese acetate, 0.02mol ammonium dihydrogen phosphate dissolved in deionized water, stir and evaporate at 80 degrees to form a gel, put the gel in a vacuum oven at 80 degrees to dry 4h, and then put it into a tube furnace with argon gas, and sinter at 650 degrees for 8h. To obtain the intermediate zirconium manganese phosphate, mix the intermediate zirconium manganese phosphate and sodium fluoride at a molar ratio of 1:3, and add 0.03 mol of citric acid. Ball milling at 500r / min for 8h, sintering at 700°C for 12h under argon gas. Get Na 3 ZrMn(PO 4 ) 2 f 3 / C.

[0075] Utilize the prepared Na 3 ZrMn(PO 4 ) 2 f 3 / C composite material, assembled into a sodium ion button battery, the measured electrochemical data has an average voltage of 4.0V, and after 100 cycles at 0.5C, the discharge specific capacity reaches 87.5mAh / g, and the capacity retention rate reaches more than 90%. .

Embodiment 3

[0077] Take 0.01mol zirconium oxynitrate, 0.01mol manganese acetate, 0.02mol ammonium dihydrogen phosphate dissolved in deionized water, stir and evaporate at 80 degrees to form a gel, put the gel in a vacuum oven at 80 degrees to dry 4h, and then put it into a tube furnace with argon, and sinter at 850 degrees for 16h. To obtain the intermediate zirconium manganese phosphate, mix the intermediate zirconium manganese phosphate and sodium fluoride at a molar ratio of 1:3, and add 0.03 mol of citric acid. Ball milling at 500r / min for 8h, sintering at 700°C for 12h under argon gas. Get Na 3 ZrMn(PO 4 ) 2 f 3 / C.

[0078] Utilize the prepared Na 3 ZrMn(PO 4 ) 2 f 3 / C composite material, assembled into a sodium ion button battery, the measured electrochemical data has an average voltage of 4.0V, and after 100 cycles at 0.5C, the discharge specific capacity reaches 84.5mAh / g, and the capacity retention rate reaches more than 90%. .

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Abstract

The invention belongs to the field of sodium ion battery materials, and particularly discloses a fluorinated zirconium-manganese-sodium phosphate / carbon composite material which is an in-situ composite material of fluorinated zirconium-manganese-sodium phosphate and carbon, wherein the chemical formula of the fluorinated zirconium-manganese-sodium phosphate / carbon composite material is Na3ZrMn(PO4)2F3. The invention also provides a preparation method and application of the material. The invention provides the in-situ composite material with a brand new chemical formula and a crystal phase structure, and finds that the composite material has electrical properties such as high charge-discharge specific capacity, good rate capability and cycling stability in a sodium ion battery.

Description

technical field [0001] The invention relates to the field of sodium ion battery materials, and relates to a positive electrode active material body of the sodium ion battery. Background technique [0002] Due to the advantages of high energy density, high stability, and long life, lithium-ion batteries have quickly occupied portable electronic products, making lithium-ion batteries continue to rise in the process of wide-scale promotion and application, resulting in high prices for lithium-ion batteries . Therefore, the application of lithium-ion batteries in the field of large-scale power storage is difficult to truly realize. Sodium-ion batteries are considered to be an ideal large-scale power storage application technology due to their rich sodium resources and environmental friendliness, and have attracted worldwide attention. [0003] Although sodium-ion batteries and lithium-ion batteries are only different in intercalating ions on the surface, they belong to differe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M4/136H01M10/054
CPCH01M4/136H01M4/362H01M4/5825H01M4/625H01M10/054Y02E60/10
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