High-nickel positive electrode material with embedded coating layer and preparation method of high-nickel positive electrode material

A technology of positive electrode material and coating layer, which is applied in the field of high nickel positive electrode material and its preparation, can solve the problems of reducing the mass specific capacity of the material, the coating material is inactive, and increasing the cost of material preparation, so as to improve the electron conduction and ion The effect of transmission, elimination of complex handling, reduction of energy consumption and cost of preparation

Pending Publication Date: 2022-03-01
TIANJIN B&M SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, the coating material is generally inactive and has poor conductivity, and the mass specific capacity of the material will be reduced after being combined with a high-nickel cathode material
In addition, the coating process usually involves high-temperature sintering, which increases the cost of material preparation. Therefore, how to achieve a better coating effect has become a concern in this field

Method used

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  • High-nickel positive electrode material with embedded coating layer and preparation method of high-nickel positive electrode material
  • High-nickel positive electrode material with embedded coating layer and preparation method of high-nickel positive electrode material
  • High-nickel positive electrode material with embedded coating layer and preparation method of high-nickel positive electrode material

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preparation example Construction

[0034] A method for preparing a high-nickel positive electrode material with an embedded cladding layer, comprising the steps of:

[0035] (1) The ternary precursor Ni x co y m 1-x-y (OH) 2 , wherein 0.6 < x ≤ 0.96, 0 ≤ y < 0.4, mixed and ground with lithium source to obtain mixture A;

[0036] (2) After the mixture A is subjected to high-temperature roasting, cooling, crushing, washing and sieving, the chemical formula is LiNi x co y m 1-x-y o 2 High-nickel cathode material B;

[0037] (3) adding the high-nickel-based cathode material B into an ethanol solution of cobalt nitrate hexahydrate under the protection of an inert gas, stirring vigorously, and mixing uniformly to obtain a mixture C;

[0038] (4) Add the mixture C to the ethanol solution of sodium borohydride, and after stirring vigorously under the protection of an inert gas, the mixture is washed with absolute ethanol, filtered, and dried to obtain the embedded coating layer. High nickel cathode material. ...

Embodiment 1

[0041] A method for preparing a high-nickel positive electrode material with an embedded cladding layer, comprising the steps of:

[0042] (1) Weigh the ternary precursor Ni 0.96 co 0.02 mn 0.01 W 0.01 (OH) 2 Mixed with LiOH, in molar ratio, LiOH:Ni 0.96 co 0.02 mn 0.01 W 0.01 (OH) 2 =1.02:1, mixture A was obtained after thorough mixing and ball milling;

[0043] (2) The mixture A is calcined at 800°C for 10 hours under an oxygen atmosphere, cooled, crushed, and sieved to obtain the chemical formula LiNi 0.96 co 0.02 mn 0.01 W 0.01 o 2 High-nickel cathode material B;

[0044] (3) Weigh 50 g of the high-nickel-based cathode material B prepared above, and add 1000 mL of 0.0291 g / mL ethanol solution of cobalt nitrate hexahydrate under vigorous stirring and argon protection to obtain a mixture C;

[0045] (4) Add 20mL of 1.5g / mL sodium borohydride ethanol solution to mixture C, stir vigorously for 3h under the protection of argon, then wash the mixture with absolute...

Embodiment 2

[0051] A method for preparing a high-nickel positive electrode material with an embedded cladding layer, comprising the steps of:

[0052] (1) Weigh the ternary precursor Ni 0.8 co 0.1 mn 0.1 (OH) 2 Mixed with LiOH, in molar ratio, LiOH:Ni 0.8 co 0.1 mn 0.1 (OH) 2 =1.02:1, mixture A was obtained after thorough mixing and ball milling;

[0053] (2) The mixture A was calcined at 800°C for 10 hours under an oxygen atmosphere, cooled, crushed, and sieved to obtain the chemical formula Li Ni 0.8 co 0.1 mn 0.1 O2 high-nickel cathode material B;

[0054] (3) Weigh 50 g of the high-nickel-based cathode material B prepared above, and add 1000 mL of 0.0291 g / mL ethanol solution of cobalt nitrate hexahydrate under vigorous stirring and argon protection to obtain a mixture C;

[0055] (4) Add 20mL of 1.5g / mL sodium borohydride ethanol solution to mixture C, stir vigorously for 3h under the protection of argon, then wash the mixture with absolute ethanol for 3 times, filter, and...

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Abstract

The invention provides a high-nickel positive electrode material with an embedded coating layer and a preparation method thereof, the high-nickel positive electrode material is of a pomegranate-shaped structure and comprises an inner core and the embedded coating layer, the chemical formula of the inner core is LiNixCoyM1-x-yO2, M is one or more of Mn, Mg, Al, Ti, Zr, Y, Nb or W, x is more than 0.6 and less than or equal to 0.96, and y is more than or equal to 0 and less than 0.4. According to the high-nickel positive electrode material with the embedded coating layer, the cobalt boride with excellent mechanical performance is adopted, the stress strain of the high-nickel positive electrode material is inhibited, and interlayer oxygen is unstable and is easy to separate out along with the embedding / separation of lithium ions and the continuous change of the valence state of nickel in the charging and discharging process, so that the high-nickel material is subjected to phase change; after cobalt boride is oxyphilic to form boron oxide (a small amount), penetration and precipitation of oxygen can be effectively inhibited, and the stability of a crystal structure is maintained.

Description

technical field [0001] The invention belongs to the field of lithium-ion battery materials, and in particular relates to a high-nickel positive electrode material with an embedded coating layer and a preparation method thereof. Background technique [0002] With the aggravation of the global energy crisis and environmental pollution, new energy electric vehicles have become a hot focus. Among them, high-nickel ternary system materials are considered to have the most potential and application due to their high reversible capacity and high working voltage. Prospects for cathode materials for lithium-ion batteries. [0003] The surface of the high-nickel ternary material is smooth. In the actual process, other impurities will be introduced to attach to the surface of the particles. The moisture and oxygen atmosphere in the storage environment will accelerate the reaction between the impurities and the electrolyte to generate Li 2 CO 3 And LiOH and other substances, thereby fo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/48H01M4/525H01M4/58
CPCH01M4/58H01M4/525H01M4/48Y02E60/10
Inventor 陈志宇吉长印吕菲徐宁吴孟涛
Owner TIANJIN B&M SCI & TECH
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