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Method for preparing hollow porous Na2MnPO4F/C nanometer fiber positive electrode material

A nanofiber, cathode material technology, applied in nanotechnology, nanotechnology, fiber processing, etc., can solve the problems of difficult to obtain electrochemical performance, unsatisfactory modification effect, low electronic conductivity and ionic conductivity, etc. The effect of improving cycle performance, enhancing electronic conductivity, and improving rate capability

Active Publication Date: 2017-08-11
SUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Despite the above advantages, its low electronic and ionic conductivity makes it difficult to obtain Na with good electrochemical performance. 2 PPML 4 F cathode material
At present, the methods of carbon coating and bulk phase doping are used to increase the Na 2 PPML 4 The electronic conductivity of F is improved by refining the particles, but the modification effect is not ideal, and further improvement is needed

Method used

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  • Method for preparing hollow porous Na2MnPO4F/C nanometer fiber positive electrode material
  • Method for preparing hollow porous Na2MnPO4F/C nanometer fiber positive electrode material
  • Method for preparing hollow porous Na2MnPO4F/C nanometer fiber positive electrode material

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Experimental program
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Effect test

Embodiment 1

[0038] a. Mole ratio Na + :Mn 2+ :PO 4 3- :F - =2.05:1:1:1 Weigh sodium fluoride, sodium dihydrogen phosphate and manganese acetate, use deionized water as solvent, stir at room temperature until completely dissolved, add molar ratio of 1:1.2 (sodium manganese fluorophosphate: Oxalic acid), then add polyvinyl alcohol with a mass ratio of 7:1 (sodium manganese fluorophosphate: high molecular weight polymer) and an average molecular weight of 6000, and continue to stir until a uniform spinning solution A is formed;

[0039]b. select mineral oil as spinning solution B;

[0040] c. Na 2 PPML 4 F Spinning solution A and mineral oil spinning solution B are drawn into the syringe respectively, and the coaxial spinning needle is installed. The inner and outer diameters of the needle are 0.3mm and 0.5mm respectively. It is 12Kv, and the spinning speed is 0.15mm / min, and the coaxial nanofiber precursor is prepared;

[0041] d. Place the coaxial nanofiber in the extractant n-hexa...

Embodiment 2

[0044] a. Mole ratio Na + :Mn 2+ :PO 4 3- :F - =2:1.05:1:1 Weigh sodium fluoride, sodium dihydrogen phosphate and manganese carbonate, use ethanol as solvent, stir at room temperature until completely dissolved, add molar ratio of 0.9:1.1 (sodium manganese fluorophosphate: oxalic acid) oxalic acid, then add polyvinyl alcohol with a mass ratio of 6.9:1 (sodium manganese fluorophosphate: high molecular weight polymer) and an average molecular weight of 6000, and continue to stir until a uniform spinning solution A is formed.

[0045] b. select mineral oil as spinning solution B;

[0046] c. Na 2 PPML 4 F Spinning solution A and mineral oil spinning solution B are drawn into the syringe respectively, and the coaxial spinning needle is installed. It is 12Kv, and the spinning speed is 0.05mm / min, and the coaxial nanofiber precursor is prepared;

[0047] d. Place the coaxial nanofiber in the extractant n-hexane to remove the oil phase, and dry to obtain the hollow nanofiber ...

Embodiment 3

[0050] a. Mole ratio Na + :Mn 2+ :PO 4 3- :F - =2:1:1.05:1 Weigh ammonium fluoride, disodium hydrogen phosphate and manganese carbonate, use ethanol as solvent, stir at room temperature until completely dissolved, add molar ratio of 1:1.2 (sodium manganese fluorophosphate: citric acid ), then add polyacrylonitrile with a mass ratio of 7.1:1.1 (sodium manganese fluorophosphate: polymer) and an average molecular weight of 100,000, and continue stirring until a uniform spinning solution A is formed;

[0051] b. select mineral oil as spinning solution B;

[0052] c. Na 2 PPML 4 F Spinning solution A and mineral oil spinning solution B are extracted into the syringe respectively, and the coaxial spinning needle is installed. Be 10Kv, spinning speed is 0.15mm / min, prepares coaxial nanofiber precursor;

[0053] d. Place the coaxial nanofiber in the extractant n-hexane to remove the oil phase, and dry to obtain the hollow nanofiber precursor;

[0054] e. Place the collected c...

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Abstract

The invention discloses a method for preparing a hollow porous Na2MnPO4F / C nanometer fiber positive electrode material. The method comprises the following steps of dissolving a sodium source, a manganese source, a phosphoric acid source, a fluorine source, a chelating agent and a macromolecular polymer in a solvent, and performing stirring to form a spinning solution A; selecting oil as a spinning liquid B, performing coaxial electrostatic spinning by taking the spinning liquid B as an internal shaft and the spinning liquid A as an external shaft to obtain a coaxial nanometer fiber; placing the coaxial nanometer fiber in an extraction agent to remove an oil phase, and obtaining a hollow nanometer fiber precursor after drying; and performing thermal processing in a non-oxidization atmosphere, and obtaining the Na2MnPO4F / C positive electrode material after cooling. The Na2MnPO4F / C hollow porous nanometer fiber is prepared by an electrostatic spinning method, the electron conductivity and the ion conductivity of the positive electrode material are remarkably improved, so that the rate performance of the battery is improved, and the cycle property of the battery is favorably improved.

Description

technical field [0001] The invention belongs to the technical field of secondary battery materials, and relates to a preparation method of a positive electrode material for a secondary battery, in particular to a hollow porous Na 2 PPML 4 A preparation method of F / C nanofiber cathode material. Background technique [0002] In recent years, with the increase in the development and utilization of new energy sources (solar energy, wind energy, etc.) and the rapid development of grid energy storage and other fields, the demand for secondary batteries has increased sharply. various portable electronic devices. However, the storage capacity of lithium is limited, and it is difficult to meet the needs of long-term development in the future. Therefore, sodium, which has similar physical and chemical properties to lithium and is cheap, has attracted widespread attention. Sodium and lithium belong to the same main group. Compared with lithium, sodium is abundant in the earth's crus...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/054D01D5/00D01D5/24B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00D01D5/003D01D5/24H01M4/366H01M4/5825H01M4/625H01M4/628H01M10/054Y02E60/10
Inventor 伍凌胡勇钟胜奎张晓萍刘洁群石少楠陈嘉彬唐式豹
Owner SUZHOU UNIV
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