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Method for compositely coating lithium battery positive electrode material with tungsten oxide and nitrogen-doped carbon

A battery cathode, nitrogen-doped carbon technology, applied in battery electrodes, positive electrodes, secondary batteries, etc., can solve the problems of inability to improve the conductivity of cathode materials, unfavorable industrial production and manufacturing, and achieve excellent electronic conductivity and electrochemical performance. Effects of improved stability, electronic conductivity and electrochemical stability, low energy consumption

Active Publication Date: 2020-11-06
GUIZHOU MEILING POWER SUPPLY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Tungsten oxide can be used as an overcharge-resistant material to suppress thermal runaway of lithium batteries and improve the electrochemical stability of positive electrode materials (patent CN110600678A); tungsten-containing compounds are used as coating materials, and the coating layer can not only effectively inhibit The side reaction between the electrolyte and the positive electrode material can also inhibit the dissolution of transition metals in the material, effectively enhancing the cycle stability of the material and the cycle performance at high rates (patent CN106935840A); however, tungsten oxide coating cannot improve Regarding the electrical conductivity of the positive electrode material, although there is also a lithium iron phosphate positive electrode material coated with a tungsten carbide shell prepared by the present invention, the material has excellent rate performance (patent CN105633362A), but the production process uses a high chemical reaction The active plasma surround method is not conducive to industrial production and manufacturing, so it is necessary to develop a new coating modification method to improve the electrochemical stability and conductivity of the positive electrode material

Method used

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  • Method for compositely coating lithium battery positive electrode material with tungsten oxide and nitrogen-doped carbon
  • Method for compositely coating lithium battery positive electrode material with tungsten oxide and nitrogen-doped carbon
  • Method for compositely coating lithium battery positive electrode material with tungsten oxide and nitrogen-doped carbon

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Dissolve ammonium metatungstate in 19 mL of water, and then disperse 1.9 grams of lithium iron phosphate in the ammonium metatungstate solution; dissolve dopamine in 1 mL of deionized water, and add it to the solution containing lithium iron phosphate and ammonium metatungstate In the dispersion, a mixed reaction solution was prepared, wherein the amount of the ammonium metatungstate substance in the mixed reaction solution was 0.024mmol, and the amount of the dopamine substance was 1.26mmol;

[0029] The mixed reaction solution was stirred at 25°C for 24 hours, and the obtained product was centrifuged, washed, and dried to obtain a tungsten and carbon precursor co-coated lithium iron phosphate material;

[0030] The dry tungsten and carbon precursor co-coated lithium iron phosphate positive electrode material was calcined under argon protection and the calcination temperature was 500°C for 6 hours to obtain the tungsten oxide and nitrogen-doped carbon co-coated lithium ...

Embodiment 2

[0038]Dissolve ammonium paratungstate in 19 mL of water, then disperse 1.9 grams of lithium iron phosphate in the ammonium paratungstate solution; dissolve dopamine in 1 mL of deionized water, and add it to the dispersion containing lithium iron phosphate and ammonium paratungstate to prepare a mixed reaction solution , wherein, the amount of the ammonium paratungstate substance in the mixed reaction solution is 0.01mmol, and the amount of the dopamine substance is 0.44mmol;

[0039] The mixed reaction solution was stirred at 5°C for 5 hours, and the obtained product was centrifuged, washed, and dried to obtain a tungsten and carbon precursor co-coated lithium iron phosphate material;

[0040] The dry tungsten and carbon precursor co-coated lithium iron phosphate cathode material was calcined under argon protection and the calcination temperature was 300°C for 7 hours to obtain the tungsten oxide and nitrogen-doped carbon co-coated lithium iron phosphate cathode material;

[0...

Embodiment 3

[0043] Dissolve sodium phosphotungstate in 19 mL of water, then disperse 1.9 g of lithium iron phosphate in the sodium phosphotungstate solution; dissolve dopamine in 1 mL of deionized water, and add it to the solution containing lithium iron phosphate and sodium phosphotungstate In the dispersion, a mixed reaction solution is obtained, wherein the amount of the ammonium paratungstate substance in the mixed reaction solution is 0.01mmol, and the amount of the dopamine substance is 0.55mmol;

[0044] The mixed reaction solution was stirred at 68°C for 30 hours, and the obtained product was centrifuged, washed, and dried to obtain a tungsten and carbon precursor co-coated lithium iron phosphate material;

[0045] The dry tungsten and carbon precursor co-coated lithium iron phosphate positive electrode material was calcined under argon protection and the calcination temperature was 420°C for 18 hours to obtain the tungsten oxide and nitrogen-doped carbon co-coated lithium iron pho...

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Abstract

The invention belongs to the technical field of manufacturing of lithium battery cathode materials, and specifically relates to a method for compositely coating a lithium battery cathode material withtungsten oxide and nitrogen-doped carbon. A coating layer is formed on the surface of the lithium battery positive electrode material by polymerization of a carbon precursor and precipitation of a tungsten precursor. Curing and bonding of coating layer are realized through a calcining process. According to the present invention, the method has characteristics of low cost, low energy consumption and simple operation, and the lithium battery positive electrode material prepared through the method has characteristics of excellent electronic conductivity and excellent electrochemical stability.

Description

technical field [0001] The invention belongs to the technical field of lithium battery anode material production, and in particular relates to a method for composite coating lithium battery anode materials with tungsten oxide and nitrogen-doped carbon. Background technique [0002] Lithium iron phosphate is one of the most widely used lithium battery electrode materials. This is mainly due to the good cycle stability brought about by the olivine crystal structure of lithium iron phosphate. On the other hand, lithium iron phosphate does not contain expensive and environmentally polluting components such as cobalt, so it has obvious advantages in material preparation and waste treatment (Chem. Eng. J. 2020, 379, 122371). However, lithium iron phosphate also has many inherent problems, which mainly include the weak electronic conductivity of lithium iron phosphate and the poor rate performance of lithium iron phosphate caused by the slow lithium ion transport performance (Ener...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/58H01M10/0525H01M10/04
CPCH01M4/5825H01M4/625H01M4/628H01M4/624H01M10/0525H01M10/0427H01M2004/028H01M2004/021Y02E60/10Y02P70/50
Inventor 史家远苟敏涛吴宁宁黄鹏唐康康胡锦飞陈晓涛石斌
Owner GUIZHOU MEILING POWER SUPPLY CO LTD
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