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

A composite positive electrode material and composite material technology, which is applied in the field of lithium-ion battery positive electrode materials, precursors and their preparation, to achieve the effects of improved stability, excellent performance, and good repeatability

Active Publication Date: 2018-08-21
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, preparation and application thereof in lithium ion batteries
  • Aluminum coated ternary zirconium-doped composite material, composite cathode material, preparation and application thereof in lithium ion batteries
  • Aluminum coated ternary zirconium-doped composite material, composite cathode material, preparation and application thereof in lithium ion batteries

Examples

Experimental program
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Effect test

Embodiment 1

[0086] A metal salt solution with a total metal ion concentration of 1.5 mol / L (Ni, Co, Al, and Zr element ratio of nickel sulfate: cobalt sulfate: aluminum nitrate: zirconium oxychloride = 79: 15: 5:1. Mix the above Add the solution together with ammonia and sodium hydroxide to the reaction kettle containing the bottom liquid (a mixture of ammonia and alkali), adjust the speed of the reaction kettle to 300r / min and the temperature to 55 degrees. Adjust the ammonium concentration of the solution system during the reaction to 8 -9g / L, the pH is 10.5, so that the uniformly mixed nickel, cobalt, aluminum, and zirconium in the solution are co-precipitated according to the stoichiometric ratio. After that, the raw material is stopped and carbon dioxide gas is introduced to adjust the pH=9. Finally, the above precursor The body (aluminum-coated ternary zirconium-doped composite material) is filtered, washed, and dried. The particle diameter D50 of the obtained precursor is 9.5um, the ...

Embodiment 2

[0090] A metal salt solution with a total metal ion concentration of 1.5 mol / L (the element ratio of Ni, Co, Al, and Zr of nickel sulfate: cobalt sulfate: sodium metaaluminate: zirconium chloride = 79.8:15:5:0.2) is prepared. Add the above mixed solution together with ammonia and sodium hydroxide into the reactor containing the sodium hydroxide and ammonia mixture, and adjust the speed of the reactor to 360r / min and the temperature to 50 degrees. Adjust the ammonium concentration of the solution system in the reaction process to 7-8g / L, and the pH to 12, so that the uniformly mixed nickel, cobalt, aluminum, and zirconium in the solution are co-precipitated according to the chemical dose ratio. After that, the feed of raw materials was stopped, and carbon dioxide gas was introduced to adjust the pH=10. Finally, the precursor is filtered, washed, and dried. The particle diameter D50 of the precursor (aluminum-coated ternary zirconium-doped composite material) is 10.3um, the thick...

Embodiment 3

[0094] 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) is prepared. Add the above mixed solution together with ammonia and sodium hydroxide into the reaction kettle containing the bottom liquid (a mixed solution of ammonia and alkali), and adjust the speed of the reaction kettle to 270 r / min and the temperature to 60 degrees. Adjust the ammonium concentration of the solution system in 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 dose ratio. After that, the feed of raw materials was stopped, and carbon dioxide gas was introduced to adjust the pH=8.5. Finally, the precursor is filtered, washed, and dried. The particle diameter D50 of the precursor (aluminum-coated ternary zirconium-doped composite material...

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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 specifically relates to a lithium ion battery cathode material and precursor and a preparation method thereof. Background technique [0002] Under the dual pressure of environmental pollution and energy crisis, looking for clean green energy is the direction of joint efforts in the world today. Lithium-ion batteries occupies a very important place in clean energy. In particular, cars with lithium-ion batteries as a power source have developed rapidly in recent years, and a new development path has been proposed for global energy and environmental issues. The performance of lithium-ion batteries mainly depends on the active materials participating in the electrode reaction. The development of the negative electrode is faster than that of the positive electrode. Therefore, the positive electrode material of the lithium-ion battery becomes particularly critical for the development of the lithium-...

Claims

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Application Information

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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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