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Material with mixture of ions with sodium vanadium phosphate cathode material coated by carbon and preparing method thereof

A technology of carbon-coated sodium vanadium phosphate and positive electrode materials, which is applied in the direction of battery electrodes, electrical components, electrochemical generators, etc., can solve the problems of affecting electrochemical performance, small ion diffusion rate, and poor electronic conductivity, etc. Effects of electrical conductivity, uniformity of carbon layer, and improvement of electrochemical performance

Active Publication Date: 2017-01-11
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But with LiFePO 4 Same, Na 3 V 2 (PO 4 ) 3 There are disadvantages such as poor electronic conductivity and low ion diffusivity, which affect its electrochemical performance.

Method used

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  • Material with mixture of ions with sodium vanadium phosphate cathode material coated by carbon and preparing method thereof
  • Material with mixture of ions with sodium vanadium phosphate cathode material coated by carbon and preparing method thereof
  • Material with mixture of ions with sodium vanadium phosphate cathode material coated by carbon and preparing method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0025] The present embodiment prepares sodium vanadium phosphate cathode material Na according to the following steps 3 V 2 (PO 4 ) 3 / C:

[0026] (1) Take by weighing 0.3975g of sodium carbonate, 0.5849g of ammonium metavanadate, 0.8627g of ammonium dihydrogen phosphate, and 1.0507g of citric acid according to the molar ratio of Na:V:P:C=3:2:3:2;

[0027] (2) Mix citric acid and ammonium metavanadate, add 200mL deionized water, stir and heat in a water bath at 80°C for 1 hour to form a mixed solution; then mix sodium carbonate and ammonium dihydrogen phosphate in deionized water, Drop by drop into the mixture, continue to stir and heat for 4 hours to form a gel; dry the gel in vacuum and grind to obtain a mixed powder;

[0028] (3) Heat the mixed powder in a tube furnace filled with nitrogen at a rate of 2min / °C to 350°C for 4 hours, take out the obtained product and grind it evenly again; The temperature was raised to 850° C. and kept for 8 hours to obtain the carbon-co...

Embodiment 2

[0034] This embodiment prepares cobalt-doped carbon-coated sodium vanadium phosphate positive electrode material Na according to the following steps 3 V 1.9 co 0.1 (PO 4 ) 3 / C:

[0035] (1) Weigh 0.3975g of sodium carbonate, 0.5557g of ammonium metavanadate, 0.0728g of cobalt nitrate, and 0.8627g of ammonium dihydrogen phosphate according to the molar ratio of Na:V:Co:P:C=3:1.9:0.1:3:2 g, citric acid 1.0507g;

[0036] (2) Mix citric acid, ammonium metavanadate and cobalt nitrate, add 200mL deionized water, stir and heat in a water bath at 80°C for 1 hour to form a mixed solution; then mix sodium carbonate and ammonium dihydrogen phosphate in deionized After soaking in water, drop it into the mixed solution drop by drop, continue to stir and heat for 4 hours to form a gel; dry the gel in vacuum and grind it to obtain a mixed powder;

[0037] (3) Heat the mixed powder in a tube furnace filled with nitrogen at a rate of 2min / °C to 350°C for 4 hours, take out the obtained p...

Embodiment 3

[0043] In this example, cobalt-fluorine co-doped carbon-coated sodium vanadium phosphate cathode material Na 3 V 1.9 co 0.1 (PO 3.99 ) 3 f 0.03 / C:

[0044] (1) Weigh sodium carbonate 0.3935g, ammonium metavanadate 0.5557g, cobalt nitrate 0.0728g, phosphoric acid according to the molar ratio of Na:V:Co:P:F:C=3:1.90:0.1:3:0.03:2 Dihydroammonia 0.8627g, sodium fluoride 0.0031g, citric acid 1.0507g;

[0045] (2) Mix citric acid, ammonium metavanadate, cobalt nitrate and sodium fluoride, add 200mL deionized water, stir and heat in a water bath at 80°C for 1 hour to form a mixed solution; then mix sodium carbonate and ammonium dihydrogen phosphate After dissolving in deionized water, drop it into the mixed solution drop by drop, continue stirring and heating for 4 hours to form a gel; dry the gel in vacuum, grind it to obtain a mixed powder;

[0046] (3) Heat the mixed powder in a tube furnace filled with nitrogen at a rate of 2min / °C to 350°C for 4 hours, take out the obtai...

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Abstract

The invention discloses material with mixture of ions with sodium vanadium phosphate cathode material coated by carbon and a preparing method thereof, characterized in that the general formula of sodium vanadium phosphate cathode material is Na3V2-xMx(PO4-y)3Y3y / C, wherein 0<x<=0.2, 0><y<=0.05, M is Al, Fe, Cr, Ni, Co, Mg, Zn, La, Cu, Mn, Ti, Mo, Sn, Sr, Nb, Ce or Y, Y is For Cl. Through the carbon coating and the doping modification with ions for sodium vanadium phosphate cathode material, the electron conductivity of the material is improved and the electron-chemical property of material can be improved obviously.

Description

technical field [0001] The invention relates to a preparation method of a positive electrode material of a sodium ion battery, in particular to a preparation method of an anion-cation-doped carbon-coated sodium vanadium phosphate positive electrode material Background technique [0002] Lithium-ion batteries have been widely used in various portable electronic products and instruments such as notebook computers, mobile phones, and digital cameras because of their advantages such as high specific energy, long cycle life, wide charging power range, and good rate discharge performance. With the rapid development of portable electronic products and electric vehicles, the demand for lithium-ion batteries is becoming more and more urgent, and the demand for lithium will increase greatly. The proportion of lithium in the earth's crust is about 0.0065%, and its abundance ranks 27th among various elements. The high cost of lithium metal has forced people to explore low-cost alternat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/583H01M4/62H01M10/054
CPCH01M4/366H01M4/5825H01M4/583H01M4/625H01M10/054Y02E60/10
Inventor 张大伟李媛媛赵亚君
Owner HEFEI UNIV OF TECH
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