Lithium-ion battery cathode material precursor, lithium-ion battery cathode material and respective preparation methods and lithium-ion battery
A technology of lithium-ion batteries and positive electrode materials, applied in battery electrodes, chemical instruments and methods, positive electrodes, etc., to achieve the effect of increased rate performance and high capacity characteristics
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[0037] According to a preferred embodiment of the present invention, in the structural formula of the cathode material precursor, 0.7≤x1<1, 0.7≤x2<1, 0<y1≤0.3, 0<y2≤0.3, 0<η1≤0.05, 0 <η2≤0.05, 0.4≤z≤0.5, and the value of 1-x1-y1-η1 is not 0, and the value of 1-x2-y2-η2 is not 0. When the Ni content in the positive electrode material precursor is relatively high, the positive electrode material prepared from the positive electrode material precursor still has relatively high safety performance.
[0038] In the present invention, D and G belong to the doping elements in the positive electrode material precursor, wherein the element D is selected from Mo, Ti, Y, W, Nb, Cr, Sm, V, La, Ca, Hf and Zr At least one of the element G is selected from at least one of Mo, Zn, Ti, Y, W, Nb, Cr, Sm, Al, V, La, Ca, Fe, Hf, Zr, Mg and B.
[0039] Element D and element G may be the same or different elements. Preferably, the types of element D and element G are different.
[0040] In the pr...
Embodiment 1
[0100] (1) Lithium-ion battery cathode material precursor T1
[0101] The structural formula of the cathode material precursor T1 for lithium-ion batteries is:
[0102] 0.40[(Ni 0.9 co 0.05 mn 0.04 Nb 0.01 )(OH) 2 ]·0.60[(Ni 0.8 co 0.05 mn 0.14 Zr 0.01 )(OH) 2 ],
[0103] The average molar ratio of metal ions in the inner core is Ni: Co: Mn: Nb = 0.90: 0.05: 0.04: 0.01, wherein the content of the doping element Nb decreases continuously along the direction from the core to the surface of the core, and the change rule is 0.02-0; at the same time The content of Mn element increases continuously along the direction from the core to the surface of the core, and the change rule is 0.03-0.05; and the total amount of doping elements Nb and Mn is kept at 0.05 during the change process, and the average particle size of the core part is 9 μm.
[0104] The average molar ratio of the metal ions in the outer shell is Ni: Co: Mn: Zr = 0.80: 0.05: 0.14: 0.01, wherein the content o...
Embodiment 2
[0122] (1) Lithium-ion battery cathode material precursor T2
[0123] Lithium-ion battery cathode material precursor T2 structural formula is:
[0124] 0.41[(Ni 0.8 co 0.05 mn 0.14 Nb 0.01 )(OH) 2 ]·0.59[(Ni 0.7 co 0.05 mn 0.24 Zr 0.01 )(OH) 2 ].
[0125] The average molar ratio of metal ions in the inner core is Ni: Co: Mn: Nb = 0.80: 0.05: 0.14: 0.01, wherein the content of the doping element Nb decreases continuously along the direction from the core to the surface of the core, and the change rule is 0.02-0; at the same time The content of Mn element increases along the direction from the core to the surface of the core, and the change rule is 0.13-0.15; and the total amount of doping elements Nb and Mn elements is maintained at 0.15 during the change process; the average particle size of the core part is 9 μm.
[0126] The average molar ratio of metal ions in the outer shell is Ni: Co: Mn: Zr = 0.70: 0.05: 0.24: 0.01, in which the content of the doping element Z...
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