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Preparation method and application of modified sodium vanadium fluorophosphate positive electrode material

A technology of sodium vanadium fluorophosphate and positive electrode materials, applied in the field of electrochemistry, can solve the problems of inability to achieve direct contact, trouble, and complete coating of positive electrode materials, etc., to achieve reduced synthesis costs, short process, and excellent cycle stability Effect

Active Publication Date: 2018-09-18
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method synthesizes positive electrode materials that cannot achieve NaVPO 4 The complete coating of F microspheres makes it impossible to completely isolate NaVPO physically 4 The direct contact between F particles and electrolyte has certain limitations.
[0007] Therefore, NaVPO 4 The interfacial side reactions of F particles in contact with the electrolyte are still a problem that plagues their practical applications

Method used

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  • Preparation method and application of modified sodium vanadium fluorophosphate positive electrode material
  • Preparation method and application of modified sodium vanadium fluorophosphate positive electrode material
  • Preparation method and application of modified sodium vanadium fluorophosphate positive electrode material

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Effect test

Embodiment 1

[0049] Sodium fluoride, ammonium metavanadate, and ammonium dihydrogen phosphate are mixed according to the ratio of sodium, vanadium, phosphorus, and fluorine elements in a molar ratio of 1:1:1:1, and the molar ratio of ammonium metavanadate is 1:1. Oxalic acid (that is, the theoretical reaction amount), dissolved in deionized water, stirred at room temperature for 2 hours, prepared a uniform NaVPO 4 F precursor solution, ultrasonic atomization (1.7MHz±10%) to form microsphere droplets, carried by the carrier gas argon to pyrolyze it in an argon atmosphere at 600 °C, the carrier gas flow rate is 1L / min, to prepare NaVPO 4 F microspheres.

[0050] Sodium carbonate, ammonium metavanadate and ammonium dihydrogen phosphate are mixed and dissolved in water according to the molar ratio of sodium, vanadium and phosphorus in a ratio of 3:2:3, and oxalic acid (theoretical 3 times the value) mixed, stirred for 2h, the prepared NaVPO 4 F microspheres were added to it, after ultrasonic...

Embodiment 2

[0055] Mix sodium fluoride, ammonium metavanadate, and ammonium dihydrogen phosphate according to the ratio of sodium, vanadium, phosphorus, and fluorine elements in a molar ratio of 1:1:1:1, add oxalic acid (3 times the theoretical amount), dissolve In deionized water, stir at room temperature for 2 hours to prepare uniform NaVPO 4 F precursor solution, ultrasonic atomization (1.7MHz±10%) to form microsphere droplets, carried by the carrier gas argon to pyrolyze it in an argon atmosphere at 500 °C, the carrier gas flow rate is 1L / min, and NaVPO is prepared 4 F microspheres.

[0056] Sodium carbonate, ammonium metavanadate and ammonium dihydrogen phosphate are mixed and dissolved in water according to the molar ratio of sodium, vanadium and phosphorus in a ratio of 3:2:3, and oxalic acid (theoretical 3 times the value) mixed, stirred for 2h, the prepared NaVPO 4 F microspheres were added to it, after ultrasonic treatment at 40KHz for 2h, put it into 120°C and dry for 12h, th...

Embodiment 3

[0060] Mix sodium fluoride, ammonium metavanadate, and ammonium dihydrogen phosphate according to the ratio of sodium, vanadium, phosphorus, and fluorine elements in a molar ratio of 1:1:1:1, add oxalic acid (adding twice the theoretical amount), dissolve In deionized water, stir at room temperature for 2 hours to prepare uniform NaVPO 4 F precursor solution, ultrasonic atomization (1.7MHz ± 10%) to form microsphere droplets, carried by the carrier gas argon and pyrolyzed in an argon atmosphere at 600 °C, the carrier gas flow rate is 2L / min, and NaVPO is prepared 4 F microspheres.

[0061] Sodium carbonate, ammonium metavanadate and ammonium dihydrogen phosphate are mixed and dissolved in water according to the molar ratio of sodium, vanadium and phosphorus in a ratio of 3:2:3, and oxalic acid (theoretical 2 times the value) mixed, stirred for 2h, the prepared NaVPO 4 F microspheres were added to it, after ultrasonic treatment at 40KHz for 2h, it was placed in 120°C for 12h,...

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Abstract

The invention discloses a preparation method and an application of a modified sodium vanadium fluorophosphate positive electrode material. The modified sodium vanadium fluorophosphate positive electrode material is a composite single-core type core-shell structure, and sequentially comprises one carbon layer, a sodium vanadium phosphate layer, one carbon layer and a sodium vanadium fluorophosphatelayer. The preparation method comprises the following steps: simply mixing all raw materials at normal temperature, performing spray pyrolysis to carry out a short-time high temperature reaction to obtain NaVPO4F microspheres, adding the NaVPO4F microspheres to a Na3V2(PO4)3 precursor solution, and performing ultrasonication, drying and calcination to successfully prepare the composite single-core type core-shell structure. The NaVPO4F microspheres are completely encapsulated, the NaVPO4F particles are physically isolated from directly contacting an electrolyte, side reactions of the sodium vanadium fluorophosphate and the electrolyte are effectively inhibited, the dissolution of the fluorine element is reduced, and the structure of the material is stabilized, so the cycle stability and the discharge specific capacity of the material are improved.

Description

technical field [0001] The invention relates to the technical field of electrochemistry, in particular to the technical field of anode materials for sodium ion batteries, in particular to a preparation method and application of a modified sodium vanadium vanadium phosphate cathode material. Background technique [0002] With the rapid development of new energy vehicles, new energy power generation (solar energy, wind energy, etc.) and grid energy storage, the demand for secondary batteries has increased dramatically. Lithium-ion batteries have been widely used because of their high energy density, long cycle life, and good safety performance. However, large-scale energy storage in the future will consume huge demand for lithium resources, and the supply of battery-grade lithium carbonate is in short supply. Sodium belongs to the same main group as lithium and is considered to be a substitute for lithium in secondary battery applications. Compared with lithium resources, so...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M4/136H01M10/054
CPCH01M4/136H01M4/366H01M4/5825H01M4/62H01M4/625H01M4/628H01M10/054Y02E60/10
Inventor 王接喜盖晓臣颜果春李新海王志兴郭华军彭文杰胡启阳
Owner CENT SOUTH UNIV
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