Aluminum-coated ternary zirconium-doped composite material, composite cathode material and its preparation and application in lithium ion battery

A composite positive electrode material and composite material technology are applied in the field of lithium ion battery positive electrode materials and precursors and their preparation to achieve the effects of excellent performance, improved cycle performance and rate performance, and guaranteed morphology regularity

Active Publication Date: 2020-12-15
CENT SOUTH UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The electrical properties of existing materials still have a large room for improvement

Method used

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  • Aluminum-coated ternary zirconium-doped composite material, composite cathode material and its preparation and application in lithium ion battery
  • Aluminum-coated ternary zirconium-doped composite material, composite cathode material and its preparation and application in lithium ion battery
  • Aluminum-coated ternary zirconium-doped composite material, composite cathode material and its preparation and application in lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0086] The metal salt solution (nickel sulfate: cobalt sulfate: aluminum nitrate: Ni, Co, Al, Zr element ratio=79:15:5:1 of zirconium oxychloride=79:15:5:1. above-mentioned mixed Solution joins in the reactor that contains bottom liquid (the mixed solution of ammoniacal liquor and alkali) together with ammoniacal liquor and sodium hydroxide, and regulating reactor rotating speed is 300r / min, and temperature is 55 degrees.The ammonium root concentration of regulating reaction process solution system is 8 -9g / L, pH is 10.5, makes the uniformly mixed nickel, cobalt, aluminum, zirconium in the solution co-precipitate according to the stoichiometric ratio. Then stop adding raw materials, and feed carbon dioxide gas to adjust pH=9. Finally, the above-mentioned precursor The precursor (aluminum-coated ternary zirconium-doped composite material) was filtered, washed, and dried. The D50 of the obtained precursor particle size was 9.5um, the thickness of the coating layer was 60nm, and t...

Embodiment 2

[0090] Prepare a metal salt solution with a total metal ion concentration of 1.5 mol / L (nickel sulfate: cobalt sulfate: sodium metaaluminate: zirconium chloride Ni, Co, Al, Zr element ratio = 79.8: 15: 5: 0.2). Add the above mixed solution together with ammonia water and sodium hydroxide into the reaction kettle containing the mixture of sodium hydroxide and ammonia water, adjust the rotation speed of the reaction kettle to 360r / min, and the temperature to 50 degrees. Adjust the ammonium root concentration of the solution system in the reaction process to be 7-8g / L, and the pH to be 12, so that the uniformly mixed nickel, cobalt, aluminum, and zirconium in the solution are co-precipitated according to the chemical dosage ratio. After that, the feeding of raw materials was stopped, and carbon dioxide gas was introduced to adjust the pH=10. Finally, the above precursor is filtered, washed, and dried. The D50 of the particle size of the obtained precursor (aluminum-coated ternary...

Embodiment 3

[0094] Prepare a metal salt solution with a total metal ion concentration of 1.5 mol / L (Ni, Co, Al, Zr element ratio of nickel sulfate: cobalt sulfate: aluminum sulfate: zirconium sulfate = 77:15:5:3). Add the above mixed solution together with ammonia water and sodium hydroxide into the reaction kettle containing the bottom liquid (a mixture of ammonia water and alkali), adjust the rotation speed of the reaction kettle to 270r / min, and the temperature to 60 degrees. Adjust the ammonium root concentration of the solution system during the reaction process to 6.5-7.5g / L, and the pH to 10.3, so that the uniformly mixed nickel, cobalt, aluminum, and zirconium in the solution are co-precipitated according to the chemical dosage ratio. Afterwards, the addition of raw materials was stopped, and carbon dioxide gas was introduced to adjust the pH=8.5. Finally, the above precursor is filtered, washed, and dried. The D50 of the particle size of the obtained precursor (aluminum-coated te...

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Abstract

Belonging to the field of lithium ion batteries, the invention discloses an aluminum coated ternary zirconium-doped composite material. The aluminum coated ternary zirconium-doped composite material comprises a core and a shell coating the core surface. The material of the core is (Ni0.8-xCo0.15Al0.05Zrx)(OH)2, wherein x is 0.001-0.03, and the material of the shell is Al(OH)3. The invention also discloses a preparation method of the aluminum coated ternary zirconium-doped composite material and a composite cathode material obtained by sintering of the composite material with a lithium source.The preparation method provided by the invention is simple and low in cost, and can achieve macro preparation. The prepared lithium ion battery doped and coated ternary material has good sphericity, specific surface area, and excellent ionic conductivity and electrical conductivity, the material can be used for lithium ion batteries and exhibits excellent cyclic stability and rate performance, thus having industrial application prospect.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, and in particular relates to a lithium ion battery positive electrode material, a precursor and a preparation method thereof. Background technique [0002] Under the double pressure of environmental pollution and energy crisis, finding clean and green energy is the direction of the world's common efforts. Lithium-ion batteries play an important role in clean energy, especially for cars powered by lithium-ion batteries, which have developed rapidly in recent years and have proposed a new development path for global energy and environmental issues. The performance of lithium-ion batteries mainly depends on the active substances participating in the electrode reaction, and the development speed of the negative electrode is faster than that of the positive electrode. Therefore, the positive electrode material of lithium-ion batteries is particularly critical for the development of lithium-ion bat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/525H01M4/62H01M10/0525
CPCH01M4/366H01M4/485H01M4/525H01M4/624H01M4/628H01M10/0525Y02E60/10
Inventor 张治安汤依伟赖延清尚国志杨幸吴剑
Owner CENT SOUTH UNIV
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