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A preparation method of a sodium vanadium ferric phosphate composite material for an electrode material of a sodium ion battery

A technology for sodium vanadium iron phosphate and sodium ion batteries, which is applied in battery electrodes, positive electrodes, secondary batteries, etc. It can solve the problems of poor rate performance and poor conductivity of sodium vanadium phosphate, and achieve good capacity performance and good cycle stability Effect

Inactive Publication Date: 2018-12-28
王子韩
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the poor conductivity of sodium vanadium phosphate makes its rate performance very poor. Therefore, it is necessary to modify sodium vanadium phosphate to improve its conductivity and improve its electrochemical performance.

Method used

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  • A preparation method of a sodium vanadium ferric phosphate composite material for an electrode material of a sodium ion battery
  • A preparation method of a sodium vanadium ferric phosphate composite material for an electrode material of a sodium ion battery

Examples

Experimental program
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Effect test

Embodiment 1

[0024] Weigh vanadium pentoxide, sodium carbonate, FeO and ammonium dihydrogen phosphate according to the molar ratio of vanadium ion, sodium ion, iron ion and phosphorus ion in vanadium source, sodium source, iron source and phosphorus source is 2.0:2.0:1.0:3 , mix the above-mentioned weighed substances and place them in a high-energy ball mill jar, use zirconia as grinding balls, grind them at 800rpm for 10min and take them out; then sinter them at 800°C for 10h in an argon atmosphere; then weigh them An appropriate amount of urea is mixed with the above-mentioned product, and nitrogen-doped treatment is performed at 150°C, and then the temperature is raised to 800°C at a heating rate of 5°C / min for heat preservation and heat treatment for 2 hours; After adding an appropriate amount of glucose for stirring, sintering at 550° C. for 6 hours, and after sintering, the final product can be washed with deionized water and ethanol several times.

Embodiment 2

[0026] Weigh vanadium dioxide, sodium hydroxide, iron nitrate and hydrogen phosphate according to the molar ratio of vanadium ion, sodium ion, iron ion and phosphorus ion in vanadium source, sodium source, iron source and phosphorus source is 2.0:2.0:1.0:3 For ammonium, the above-mentioned weighed substances were mixed and placed in a high-energy ball mill jar, and zirconia was used as a grinding ball. After grinding at 800rpm for 10min, it was taken out; then it was sintered at 800°C for 10h under an argon atmosphere; Take an appropriate amount of urea and mix it with the aforementioned product, first do nitrogen doping treatment at 150°C, and then raise the temperature to 800°C at a heating rate of 5°C / min for heat preservation and heat treatment for 2 hours; after the reaction, wait for the product to drop to room temperature, and then After adding an appropriate amount of sucrose to it for stirring, it is sintered at 550° C. for 6 hours. After the sintering is completed, th...

Embodiment 3

[0028] Weigh vanadium dioxide, sodium hydroxide, sodium citrate, iron nitrate according to the molar ratio of vanadium ion, sodium ion, iron ion and phosphorus ion in vanadium source, sodium source, iron source and phosphorus source is 2.0:2.0:1.0:3 and diammonium hydrogen phosphate, mix the above-mentioned weighed substances and place them in a high-energy ball mill jar, use zirconia as grinding balls, grind them at 1000rpm for 8min, then take them out; then sinter them at 800°C for 10h under nitrogen atmosphere; Then weigh an appropriate amount of urea and mix it with the above-mentioned product, first carry out nitrogen doping treatment at 150°C, and then heat up to 800°C at a heating rate of 10°C / min for heat preservation and heat treatment for 2 hours; after the reaction, wait for the product to drop to At room temperature, add an appropriate amount of glucose to it for stirring, and then sinter at 550° C. for 6 hours. After the sintering, the final product can be washed w...

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Abstract

The object of the invention is to prepare a sodium ion battery electrode composite material, which has good performance. The preparation process of the material has the advantages of simple preparation process, low cost and good application prospect. The main steps are as follows: 1) mixing vanadium source, sodium source, phosphorus source and iron source uniformly according to a certain proportion, and putting the mixture in a high energy ball milling pot for preliminary reaction; at the end, transferring the mixture to an atmosphere furnace for calcining to obtain a vanadium ferric phosphatesodium electrode material; 2) adding a proper amount of urea into the obtained sodium vanadium ferric phosphate electrode material, uniformly mixing the urea with a glass rod, grinding the urea in amortar, and carrying out nitrogen-doping heat treatment in a tube furnace to obtain a nitrogen-doped sodium vanadium ferric phosphate electrode material; 3) adding an appropriate amount of carbon source into the nitrogen-doped sodium ferrovanadium phosphate electrode material and sintering in an inert atmosphere to obtain a final product-carbon-coated nitrogen-doped sodium ferrovanadium phosphateelectrode material.

Description

technical field [0001] The invention relates to the field of preparation of anode materials for secondary batteries, in particular to a preparation method of an electrode material of a sodium ion battery-sodium iron vanadium phosphate composite material. Background technique [0002] In 1997, Goodenough et al. of the University of Texas disclosed a lithium battery anode material-lithium iron phosphate in the patent US5910382. Cycling performance, but since lithium iron phosphate can only allow lithium ions to move in one direction, and this channel is easily blocked by impurities or dislocations in the crystal lattice, the conductivity and current rate characteristics of lithium iron phosphate In addition, in recent years, with the increasing scarcity of lithium ore, the cost of this cathode material has also skyrocketed. For this reason, it is necessary to develop a new type of electrode material to solve this problem, and then, the application of sodium ion batteries is b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/054
CPCH01M4/366H01M4/5825H01M4/625H01M10/054H01M2004/021H01M2004/028Y02E60/10
Inventor 王子韩吕振瑞张亮
Owner 王子韩