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Preparation method of sodium vanadium phosphate type sodium battery positive electrode material

A cathode material, sodium vanadium phosphate technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of low sodium iron phosphate capacity, long cycle life, short cycle life, etc., to improve ionic conductivity, primary particle The effect of small diameter and increased capacity

Pending Publication Date: 2022-04-12
SICHUAN LOMON PHOSPHORUS CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, common sodium battery materials have certain problems. The capacity of sodium iron phosphate is low, but its cycle life is long, and the capacity of layered oxides is high, but its cycle life is short.

Method used

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  • Preparation method of sodium vanadium phosphate type sodium battery positive electrode material
  • Preparation method of sodium vanadium phosphate type sodium battery positive electrode material
  • Preparation method of sodium vanadium phosphate type sodium battery positive electrode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] A kind of preparation method of sodium vanadium phosphate type sodium battery cathode material, it is the following steps:

[0044] (1) Dissolve vanadium trichloride, ferric chloride and phosphorous acid in absolute alcohol, then add ammonia-alcohol solution, then pour it into the hydrothermal reaction kettle, then feed nitrogen, and hydrothermally react The air in the still is discharged, and then the temperature is raised to 165° C., the pressure is 0.8 MPa, the reaction time is 16 hours, and the obtained slurry is filtered to obtain a solid and a filtrate;

[0045] (2) Add the hydrogen peroxide slurry to the obtained solid, then react for 1.5h at a temperature of 50°C, and obtain the solid particles obtained by filtering and washing to obtain a ferrophosphorus vanadium precipitate;

[0046] (3) Add sodium phosphate solution and ammonium dihydrogen phosphate to ferrophosphorus vanadium precipitate, then add dispersant, add water so that the solid content in the slurry...

Embodiment 2

[0062] It is the following steps:

[0063] (1) Dissolve vanadium trichloride, ferric chloride and phosphorous acid in absolute alcohol, then add ammonia-alcohol solution, then pour it into the hydrothermal reaction kettle, then feed nitrogen, and hydrothermally react The air in the still is discharged, and then the temperature is raised to 150° C., the pressure is 0.9 MPa, the reaction time is 18 hours, and the obtained slurry is filtered to obtain a solid and a filtrate;

[0064] (2) Add the hydrogen peroxide slurry to the obtained solid, then react for 1 h at a temperature of 55 ° C, and obtain the solid particles through filtration and washing to obtain a ferrophosphorus vanadium precipitate;

[0065] (3) Add sodium phosphate solution and ammonium dihydrogen phosphate to ferrophosphorus vanadium precipitate, then add dispersant, add water so that the solid content in the slurry is 30%, after stirring and slurrying, spray dry to obtain spray-dried material;

[0066] (4) The...

Embodiment 3

[0079] It is the following steps:

[0080] (1) Dissolve vanadium trichloride, ferric chloride and phosphorous acid in absolute alcohol, then add ammonia-alcohol solution, then pour it into the hydrothermal reaction kettle, then feed nitrogen, and hydrothermally react The air in the kettle is discharged, and then the temperature is raised to 180° C., the pressure is 0.6 MPa, the reaction time is 12 hours, and the obtained slurry is filtered to obtain a solid and a filtrate;

[0081] (2) Add the hydrogen peroxide slurry to the obtained solid, then react 1 at a temperature of 55° C., and obtain the solid particles obtained by filtering and washing to obtain ferrophosphorus vanadium precipitate;

[0082] (3) Add sodium phosphate solution and ammonium dihydrogen phosphate to ferrophosphorus vanadium precipitate, then add dispersant, add water so that the solid content in the slurry is 40%, after stirring and slurrying, spray dry to obtain spray-dried material;

[0083] (4) The obt...

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Abstract

The invention discloses a preparation method of a sodium vanadium phosphate type sodium battery positive electrode material. The method comprises the following steps: dissolving vanadium trichloride, ferric trichloride and phosphorous acid in anhydrous alcohol, then adding an ammonia gas-alcohol solution, then pouring into a hydrothermal reaction kettle, then introducing nitrogen, discharging air in the hydrothermal reaction kettle, then heating, reacting at high temperature and high pressure, and filtering the obtained slurry to obtain a solid and filtrate; adding hydrogen peroxide into the obtained solid for slurrying, then reacting, and filtering and washing the obtained solid particles to obtain a ferrovanadium phosphorus precipitate; adding a sodium phosphate solution and ammonium dihydrogen phosphate into the ferrovanadium phosphorus precipitate, then adding a dispersing agent, stirring and slurrying, and carrying out spray drying to obtain a spray-dried material; and calcining the obtained dried material, keeping the calcining process in a nitrogen atmosphere, and then screening to remove iron, thereby obtaining the sodium ion battery material. The sodium vanadium phosphate type sodium battery positive electrode material is small in primary particle size, good in rate capability, high in capacity, simple to prepare and low in cost.

Description

technical field [0001] The invention relates to a preparation method of a vanadium sodium phosphate type sodium battery cathode material, belonging to the technical field of new energy materials. Background technique [0002] The field of power batteries is becoming more and more diversified, and the competition is constantly escalating. Who will be the leader in the future? The power battery, known as the "heart" of new energy vehicles, has attracted much attention as the new energy vehicle market heats up. At present, due to continuous technological changes and fluctuations in raw material prices, new changes are taking place in the field of power batteries. [0003] However, as the price of lithium sources rises, it will have a great impact on the cost of lithium iron phosphate. In September 2021, the price of lithium iron phosphate will rise to 90,000-100,000 per ton, so there is an urgent need for materials with lower costs. Replace lithium iron phosphate material. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/58H01M10/054
CPCY02E60/10
Inventor 罗显明秦正伟付全军何丰王永红
Owner SICHUAN LOMON PHOSPHORUS CHEM
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