	US 11,888,145 B2
	Ternary single crystal positive electrode material, preparation method therefor and use thereof
Feilong Li, Foshan (CN); Dingshan Ruan, Foshan (CN); Shuai Han, Foshan (CN); Wenzhu Ma, Foshan (CN); Quele Wang, Foshan (CN); Qingcheng Fang, Foshan (CN); and Changdong Li, Foshan (CN)
Assigned to GUANGDONG BRUNP RECYCLING TECHNOLOGY CO., LTD., Foshan (CN); HUNAN BRUNP RECYCLING TECHNOLOGY CO., LTD., Changsha (CN); and HUNAN BRUNP VEHICLES RECYCLING CO., LTD., Changsha (CN)
Appl. No. 18/245,886
Filed by GUANGDONG BRUNP RECYCLING TECHNOLOGY CO., LTD., Foshan (CN); HUNAN BRUNP RECYCLING TECHNOLOGY CO., LTD., Changsha (CN); and HUNAN BRUNP VEHICLES RECYCLING CO., LTD., Changsha (CN)
PCT Filed Aug. 3, 2021, PCT No. PCT/CN2021/110332 § 371(c)(1), (2) Date Mar. 17, 2023, PCT Pub. No. WO2022/062677, PCT Pub. Date Mar. 31, 2022.
Claims priority of application No. 202011013341.4 (CN), filed on Sep. 24, 2020.
Prior Publication US 2023/0299264 A1, Sep. 21, 2023
Int. Cl. H01M 4/04 (2006.01); H01M 4/505 (2010.01); H01M 4/525 (2010.01); H01M 10/0525 (2010.01); H01M 4/02 (2006.01)

CPC H01M 4/0471 (2013.01) [H01M 4/505 (2013.01); H01M 4/525 (2013.01); H01M 10/0525 (2013.01); H01M 2004/021 (2013.01); H01M 2004/028 (2013.01)]

8 Claims

1. A method for preparing a ternary single crystal positive electrode material, comprising the following steps:

(1) mixing a ternary polycrystalline micropowder, raising a temperature, carrying out a primary sintering, and lowering the temperature to obtain an intermediate;

(2) subjecting the intermediate to jet pulverization to obtain a single crystal material, washing the single crystal material with water, and centrifugally drying the single crystal material to obtain a material with a residual alkali content of less than 1500 ppm; and

(3) adding a coating agent to the material, raising a temperature, carrying out a secondary sintering, and lowering the temperature to obtain the ternary single crystal positive electrode material; wherein the coating agent is at least one of an oxide, hydroxide and salt of a metal, or an oxide and fluoride of a non-metal, or a corresponding acid and salt of the non-metal; the metal is at least one of Al, Ce, Y, Zn, Si, Cr, Nb, Mg, La, Sr, Zr, Sn, Na, Ca, Sb, V, and W; and the non-metal is at least one of B, P, F, C, and S, with aluminum hydroxide being excluded;

wherein in step (1), the ternary polycrystalline micropowder is an unqualified product produced by means of mechanical grinding of the ternary polycrystalline material during crushing, which is a by-product produced during crushing of the ternary polycrystalline material; and a chemical formula of the ternary polycrystalline micropowder is LiNi_xCo_yMn_zO₂, with 0.5≤x≤0.95, 0≤y≤0.4, 0.05≤z≤0.4, and x+y+z=1.

7. A ternary single crystal positive electrode material, wherein the ternary single crystal positive electrode material is prepared by the method of claim 1, a chemical formula of the ternary single crystal positive electrode material is LiNi_xCo_yMn_zO₂@M, wherein the coating agent is at least one of an oxide and fluoride of a non-metal, or a corresponding acid and salt of the non-metal, wherein M is at least one of Si, B, P, F, C, S; and Sb, with 0.5≤x≤0.95, 0≤y≤0.4, 0.05≤z≤0.4, and x+y+z=1; a resistivity of the ternary single crystal positive electrode material is 450-650 Ω·cm, a first discharge specific capacity is 200-206 mAh/g, a capacity retention rate after 50 cycles is greater than 96%, and a compaction density is 3.3-3.5 g/cm³.