Positive electrode material and preparation method and application thereof

[0064] Yet another embodiment provides a method for preparing the positive electrode material, the preparation method comprising:

[0065] mixing the positive electrode material core with the first cobalt source, and performing the first sintering; and

[0066] The first sintered product is mixed with the second cobalt source, and the second sintering is carried out to obtain the positive electrode material.

[0067] In some embodiments, the ratio of the total mass of the first cobalt source and the second cobalt source to the mass of the positive electrode material core is m:(100-m), wherein m is 0.01 to 2, preferably 1.4 to 1.6.

[0068] In some embodiments, the mass ratio of the first cobalt source and the second cobalt source is n:(100-n), wherein n is 10-30, preferably 24-26.

[0069] In some embodiments, the first cobalt source includes CoOOH, CoCO 3 , Co(NO 3 ) 2 and Co(NO 3 ) 4 Any one or a combination of at least two, preferably CoOOH.

[0070] In some embodiment

[0077] This embodiment provides a positive electrode material, the positive electrode material includes single crystal LiNi 0.53 co 0.11 mn 0.36 o 2 Inner core, coated with single crystal LiNi in planar form 0.53 co 0.11 mn 0.36 o 2The first cladding layer on the surface of the inner core and the second cladding layer coated on the surface of the first cladding layer in the form of dots, the first cladding layer includes amorphous cobalt oxide, and the second cladding layer The layer includes crystalline cobalt oxide, the ratio of the mass of the core of the positive electrode material in the positive electrode material to the total mass of the first cladding layer and the second cladding layer is 98.54:1.46, and the first cladding layer and the second cladding layer The mass ratio of the cladding is 21:79.

[0078] This embodiment also provides a preparation method for the above positive electrode material, the preparation method comprising the following steps:

[0079]

[0083] This embodiment provides a positive electrode material, which includes secondary spherical LiNi 0.53 co 0.11 mn 0.36 o 2 Inner core, covered in quadratic spherical LiNi in planar form 0.53 co 0.11 mn 0.36 o 2 The first cladding layer on the surface of the inner core and the second cladding layer coated on the surface of the first cladding layer in the form of dots, the first cladding layer includes amorphous cobalt oxide, and the second cladding layer The layer includes crystalline cobalt oxide, the ratio of the mass of the core of the positive electrode material in the positive electrode material to the total mass of the first cladding layer and the second cladding layer is 99.25:0.75, and the first cladding layer and the second cladding layer The mass ratio of the coating is 12.6:87.4.

[0084] This embodiment also provides a preparation method for the above positive electrode material, the preparation method comprising the following steps:

[0085] (1) CoCO 3 a