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Double-oxide co-coated high-nickel lithium battery positive electrode material and preparation method thereof

A technology of double oxides and positive electrode materials, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of difficult control of residual alkali content on the surface of precursors and high alkali content, and achieve stable performance of prepared materials, inhibition of decomposition, Corrosion Inhibition Effect

Inactive Publication Date: 2018-08-10
CHENDU NEW KELI CHEM SCI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] For the existing surface coating and doping can suppress its structural instability to some extent, but it is difficult to maintain its capacity and charge and discharge performance while stabilizing the structure, and it is very difficult to control the residual alkali content on the surface of the precursor defect, the present invention proposes a double oxide layer co-coated high-nickel lithium battery positive electrode material and its preparation method, which not only solves the problem of high alkali content in the precursor preparation process of traditional high-nickel ternary materials, but also through the formation of The physical separation layer protects the positive electrode material and improves the cycle performance of the battery

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] (1) Weigh the metal salt raw materials lithium acetate, nickel chloride, cobalt chloride and aluminum chloride according to the molar ratio of 1:0.6:0.25:0.15, and prepare the metal salts into 1mol / L solutions, and add them to the flask Heating in a constant temperature water bath at 76°C, while stirring continuously with an electric mixer, make 1.5mol / L sodium hydroxide and 19% ammonia water as a precipitant and add it to the mixed solution, react for 35 minutes, and the aging temperature is 72°C , aged for 18 hours, fired, repeatedly washed with deionized water, dried at 100°C for 7 hours, and cooled to 42°C to obtain the high-nickel ternary precursor material LiNi 0.6 co 0.52 al 0.15 o 2 ;

[0033] (2) Weigh 1 part of the high-nickel precursor material, 1 part of lithium hydroxide and calcium hydroxide raw materials with a molar ratio of 1:13, 2.5 parts of cerium oxide and zinc oxide, Na 2 SO 4 2.5 parts, 20 parts of ethylene glycol ether;

[0034] (3) Mix the ...

Embodiment 2

[0039] (1) Weigh the metal salt raw materials according to the molar ratio 1:0.8:0.18:0.02. The metal salt raw materials include lithium chloride, nickel chloride, cobalt chloride, and aluminum chloride, and each of the metal salts is configured into Add 1mol / L solution into the flask, heat it in a constant temperature water bath at 80°C, and at the same time stir continuously with an electric mixer, make 1.5mol / L sodium hydroxide and 19% ammonia water into the precipitant, add it to the mixed solution, and react for 35 minutes , after aging at 72°C for 18 hours, firing, repeated washing with deionized water, drying at 100°C for 7 hours, and cooling to 42°C, the high-nickel ternary precursor material LiNi was obtained. 0.8 co 0.18 al 0.02 o 2 ;

[0040] (2) Weigh 1 part of the high-nickel precursor material, 1 part of lithium hydroxide and calcium hydroxide raw materials with a molar ratio of 1:15, 3 parts of cerium oxide, CuSO 4 1.1 parts, 14 parts of styrene;

[0041] (...

Embodiment 3

[0046] (1) Weigh the metal salt raw materials according to the molar ratio 1:0.6:0.38:0.12. The metal salt raw materials include lithium nitrate, nickel nitrate, cobalt nitrate, and manganese nitrate. The metal salts are each configured into 1mol / L Add the solution into a flask, heat it in a constant temperature water bath at 50°C, and at the same time stir continuously with an electric mixer, and add 1.5mol / L sodium hydroxide and 19% ammonia water into a precipitating agent and add it to the mixed solution. After reacting for 35 minutes, aging at 72°C for 18 hours, firing deionized water for repeated cleaning, drying at 100°C for 7 hours, and cooling to 42°C, a high-nickel ternary precursor material was obtained, and a high-nickel three-component Primary precursor material LiNi 0.6 co 0.52 mn 0.12 o 2 .

[0047] (2) Weigh 1 part of the high-nickel precursor material, 1 part of lithium hydroxide and calcium hydroxide raw materials with a molar ratio of 1:23, 1.5 parts of c...

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Abstract

The invention provides a double-oxide co-coated high-nickel lithium battery positive electrode material and a preparation method thereof. A high-nickel ternary precursor material is prepared through aco-precipitation method; and then, vacuum pre-sintering is carried out after fully mixing and ball-milling with lithium hydroxide and calcium hydroxide; later, sulfate, metal oxide titanium oxide, cerium oxide and the like are added into gel synthesized in an organic solvent; and the high-nickel lithium battery positive electrode material coated by a double-oxide layer is obtained after sintering. According to the method in the invention, the problem that the alkali content of the traditional high-nickel ternary material is excessively high in the precursor preparation process is solved; theprepared double-oxide-layer coated high-nickel lithium battery positive electrode material forms a physical isolation layer, so that the corrosion of HF in the electrolyte and the generation of side reactions are inhibited, the high-nickel lithium battery positive electrode material is protected; therefore, the cycling performance of the battery is improved; meanwhile, the introduced sulfate ionsform a stable electrolyte layer, so that the decomposition of the electrolyte is inhibited, and the cycling performance of the battery is further improved.

Description

technical field [0001] The invention relates to the field of lithium ion battery materials, in particular to a double oxide co-coated high-nickel lithium battery positive electrode material and a preparation method. Background technique [0002] With the process of economic globalization and the increasing demand for energy, finding new energy storage devices has become a hot spot in the field of new energy. Compared with traditional storage batteries, lithium-ion batteries not only have higher energy, stronger discharge capacity, and longer cycle life, but also have an energy storage efficiency of more than 90%. The above characteristics determine the use of lithium-ion batteries in electric vehicles, storage power, etc. Great prospects for development. As lithium batteries become the mainstream of power supplies for various electronic devices, the demand continues to increase, and the requirements for batteries are also getting higher and higher. It is more and more impor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/525H01M4/62H01M10/0525
CPCH01M4/366H01M4/525H01M4/628H01M10/0525Y02E60/10
Inventor 陈庆廖健淞
Owner CHENDU NEW KELI CHEM SCI CO LTD
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