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Fluorinated zirconium-manganese-sodium phosphate/carbon composite material, positive electrode material, positive electrode, sodium ion battery and preparation method of fluorinated zirconium-manganese-sodium phosphate/carbon composite material

A technology of fluorinated sodium zirconium manganese phosphate and sodium zirconium manganese phosphate, applied in the field of sodium ion battery materials, can solve the problem of electrode material specific capacity, kinetic performance and cycle performance deterioration, technology maturity lag, intercalation and diffusion difficulties and other problems, to achieve the effect of being conducive to rapid migration, improved electrical properties, and excellent electrochemical properties

Active Publication Date: 2019-09-27
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • Fluorinated zirconium-manganese-sodium phosphate/carbon composite material, positive electrode material, positive electrode, sodium ion battery and preparation method of fluorinated zirconium-manganese-sodium phosphate/carbon composite material
  • Fluorinated zirconium-manganese-sodium phosphate/carbon composite material, positive electrode material, positive electrode, sodium ion battery and preparation method of fluorinated zirconium-manganese-sodium phosphate/carbon composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0071] Dissolve 0.01mol of zirconium oxynitrate, 0.01mol of manganese acetate, 0.02mol of ammonium dihydrogen phosphate in deionized water, stir and evaporate at 80 degrees to form a gel, and place the gel in a vacuum drying oven at 80 degrees to dry 4h, and then put it into a tube furnace with argon gas, and sintered at 750 degrees for 10h. The intermediate zirconium manganese phosphate is obtained, the zirconium manganese phosphate intermediate and sodium fluoride are mixed in a molar ratio of 1:3, and 0.03 mol of citric acid is added. 500r / min ball milling for 8h, sintering at 700 degrees under argon for 12h. Get Na 3 ZrMn(PO 4 ) 2 F 3 / C, xrd such as figure 1 , sem, figure 2 .

[0072] Using the prepared Na 3 ZrMn(PO 4 ) 2 F 3 / C composite material, assembled into a sodium ion button battery, the measured electrochemical data are as follows, the average voltage is 4.0V, after 100 cycles at 0.5C, the discharge specific capacity reaches 90.5mAh / g, and the capacit...

Embodiment 2

[0074] Dissolve 0.01mol of zirconium oxynitrate, 0.01mol of manganese acetate, 0.02mol of ammonium dihydrogen phosphate in deionized water, stir and evaporate at 80 degrees to form a gel, and place the gel in a vacuum drying oven at 80 degrees to dry 4h, and then put it into a tube furnace with argon gas, and sintered at 650 degrees for 8h. The intermediate manganese zirconium phosphate is obtained, the intermediate manganese zirconium phosphate and sodium fluoride are mixed in a molar ratio of 1:3, and 0.03 mol of citric acid is added. 500r / min ball milling for 8h, sintering at 700 degrees under argon for 12h. Get Na 3 ZrMn(PO 4 ) 2 F 3 / C.

[0075] Using the prepared Na 3 ZrMn(PO 4 ) 2 F 3 / C composite material, assembled into a sodium ion button battery, the measured electrochemical data are as follows, the average voltage is 4.0V, 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] Dissolve 0.01mol of zirconium oxynitrate, 0.01mol of manganese acetate, 0.02mol of ammonium dihydrogen phosphate in deionized water, stir and evaporate at 80 degrees to form a gel, and place the gel in a vacuum drying oven at 80 degrees to dry 4h, and then put it into a tube furnace with argon gas, and sintered at 850 degrees for 16h. The intermediate manganese zirconium phosphate is obtained, the intermediate manganese zirconium phosphate and sodium fluoride are mixed in a molar ratio of 1:3, and 0.03 mol of citric acid is added. 500r / min ball milling for 8h, sintering at 700 degrees under argon for 12h. Get Na 3 ZrMn(PO 4 ) 2 F 3 / C.

[0078] Using the prepared Na 3 ZrMn(PO 4 ) 2 F 3 / C composite material, assembled into a sodium-ion button battery, the measured electrochemical data are as follows, the average voltage is 4.0V, 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 particularly relates to a positive electrode active material body of a 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, which has led to the rising price of lithium-ion batteries in the process of large-scale promotion and application, resulting in high prices of lithium-ion batteries. . Therefore, the application of lithium-ion batteries in the field of large-scale power storage is difficult to achieve. Na-ion batteries are considered to be an ideal large-scale power storage application technology due to their abundant reserves of sodium resources and their environmental friendliness. [0003] Although sodium-ion batteries and lithium-ion batteries are only different in the intercalation of ions on the surface, they belong to diff...

Claims

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Application Information

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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 CENT SOUTH UNIV
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