LITHIUM-MANGANESE-NICKEL COMPOSITE OXIDE AND PREPARATION METHOD THEREFOR, ELECTRODE PLATE, BATTERY, AND POWER CONSUMING DEVICE
The present application discloses a lithium-manganese-nickel-containing composite oxide and a preparation method therefor, a positive electrode plate, a battery, and a power consuming device. The lithium-manganese-nickel composite oxide is in a spinel crystal form, and the ratio of the peak intensity I 111 of the (111) peak to the peak intensity I 400 of the (400) peak in an X-ray diffraction pattern of the lithium-manganese-nickel composite oxide is 2.1≤I 111 /I 400 ≤3.3, wherein the diffraction angle of the (111) peak is 2θ=18°-19.5°, and the diffraction angle of the (400) peak is 2θ=43.5°-45°. In the above manner, the technical solution of the present application can improve the stability of the positive electrode active material, thereby improving the overall performance of the battery.
1 . A lithium-manganese-nickel composite oxide, wherein
the lithium-manganese-nickel composite oxide is in a spinel crystal form, and the ratio of the peak intensity I 111 of the (111) peak to the peak intensity I 400 of the (400) peak in an X-ray diffraction pattern of the lithium-manganese-nickel composite oxide is 2.1≤I 111 /I 400 ≤3.3, wherein the diffraction angle of the (111) peak is 2θ=18°-19.5°, and the diffraction angle of the (400) peak is 2θ=43.5°-45°.
2 . The lithium-manganese-nickel composite oxide according to claim 1 , wherein
the average chemical composition of the lithium-manganese-nickel composite oxide is Li 1+a M x Ni 0.5+z Mn 1.5−x−z O 4−k , wherein 0<a≤0.3, 0<x≤0.2, −0.3≤z≤0.3, 0≤k≤0.2, and M includes one or more elements of Na, Si, P, S, Nb, Mo, Ru, Te, Ce, Ta, and W.
3 . The lithium-manganese-nickel composite oxide according to claim 1 , wherein
the average chemical composition of the lithium-manganese-nickel composite oxide is Li 1+a M x N y Ni 0.5+z Mn 1.5−x−y−z O 4−k−q Q q , wherein 0<a≤0.3, 0<x≤0.2, 0≤y≤0.3, −0.3≤z≤0.3, 0≤k≤0.2, 0≤q≤0.5, M includes one or more elements of Na, Si, P, S, Nb, Mo, Ru, Te, Ce, Ta, and W, N includes one or more elements of Mg, Al, K, Sc, Ti, V, Cr, Fe, Co, Rb, Sr, Y, Zr, Rh, Sb, La, Sm, Gd, Yb, Lu, and Hf, and Q includes one or more elements of F, Cl, Br, and I.
4 . The lithium-manganese-nickel composite oxide according to claim 2 , wherein 1≤a/x≤20.
5 . The lithium-manganese-nickel composite oxide according to claim 2 , wherein 0.03≤a≤0.15.
6 . The lithium-manganese-nickel composite oxide according to claim 2 , wherein 0.002≤x≤0.1.
7 . The lithium-manganese-nickel composite oxide according to claim 2 , wherein 0<x+y+z≤0.3.
8 . The lithium-manganese-nickel composite oxide according to claim 2 , wherein 2.4≤I 111 /I 400 ≤2.8; 2≤a/x≤10; 0.05≤a≤0.12; 0.01≤x≤0.06; 0.005≤y≤0.05; 0.01≤z≤0.1; 0.01≤x+y+z≤0.1; 0.01≤q≤0.1; and 0≤k≤0.1.
9 . The lithium-manganese-nickel composite oxide according to claim 1 , wherein
the lithium-manganese-nickel composite oxide has at least one peak at a diffraction angle of 2θ=21.5°-24° in the X-ray diffraction pattern, and the ratio of the intensity of the strongest peak at the diffraction angle of 2θ=21.5°-24° to the intensity of the (111) peak is 0<I (21.5°-24°) /I 111 ≤3%.
10 . The lithium-manganese-nickel composite oxide according to claim 1 , wherein
when a battery having the lithium-manganese-nickel composite oxide as a positive electrode material and Li as a negative electrode material is charged at a charging rate of 0.1 C, the ratio of the charge capacity of the battery in a range of 3.5-4.4 V to a total charge capacity in a range of 3.5-4.95 V is less than or equal to 15%.
11 . The lithium-manganese-nickel composite oxide according to claim 1 , wherein the lithium-manganese-nickel composite oxide comprises one or more of single crystal particles, quasi-single crystal particles, and polycrystal particles.
12 . The lithium-manganese-nickel composite oxide according to claim 11 , wherein the number of crystal grains contained in one single crystal particle/quasi-single crystal particle is 1≤n≤8.
13 . The lithium-manganese-nickel composite oxide according to claim 11 , wherein the crystal grains have a shape including any one or more of a spheroid, an octahedron, an octahedron-truncated regular shape, an octahedron with rounded edges, and/or an octahedron-truncated polyhedral regular shape with rounded edges.
14 . The lithium-manganese-nickel composite oxide according to claim 1 , wherein the lithium-manganese-nickel composite oxide has a volume median particle size of 2 μm≤D V50 ≤20 μm.
15 . The lithium-manganese-nickel composite oxide according to claim 1 , wherein the lithium-manganese-nickel composite oxide has a powder pH of 10≤pH≤12.
16 . The lithium-manganese-nickel composite oxide according to claim 1 , wherein the lithium-manganese-nickel composite oxide has a specific surface area of 0<BET≤0.8 m 2 /g.
17 . A positive electrode plate, comprising a positive electrode material and a positive electrode current collector, wherein the positive electrode material comprises a lithium-manganese-nickel composite oxide according to claim 1 .
18 . A battery, comprising: a positive electrode plate, a separator, and a negative electrode plate, wherein the separator is located between the positive electrode plate and the negative electrode plate for isolation, and the positive electrode plate includes a positive electrode plate according to claim 17 .
19 . The battery according to claim 18 , wherein the battery further comprises an electrolyte solution, and the electrolyte solution comprises a solvent including one or more of fluorocarbonates, fluorocarboxylates, sulfones, and fluoroethers.
20 . A power consuming device, comprising a battery according to claim 18 .