Metal hydroxide, positive electrode material, electrochemical device, and electrical device
AssigneeNingde Amperex Technology Limited
InventorsShiyang Cheng, Jumpei Shitaba, Ye Lang
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Abstract
A metal hydroxide includes Ni element. An axial lattice constant c Å of the metal hydroxide satisfies: 0.363x+4.2≤c≤0.363x+4.4, where, based on a total molar mass of a metal element in the metal hydroxide, a molar percentage of the Ni element in the metal hydroxide is x. The lattice constant c of the metal hydroxide falls within a specified value range. The positive electrode material prepared from the metal hydroxide serving as a precursor is of excellent structural stability in a charging and discharging environment, and improves the cycle performance, high-temperature performance, and safety performance of lithium-ion batteries.
Claims20
A metal hydroxide, comprising Ni element;
- wherein based on a total molar mass of metal elements in the metal hydroxide, a molar percentage of the Ni element in the metal hydroxide is x, and an axial lattice constant c Å of the metal hydroxide satisfies:
- 0.363x+4.2≤c≤0.363x+4.4.
A positive electrode material, wherein the positive electrode material comprises a lithium-nickel composite oxide, and an X-ray diffraction spectrum of the positive electrode material comprises a first diffraction peak, a second diffraction peak, and a third diffraction peak distributed sequentially from a low angle to a high angle in a range of 34° to 39°, and 0.25≤(a peak intensity of the second diffraction peak+a peak intensity of the third diffraction peak)/a peak intensity of the first diffraction peak≤0.5.
An electrochemical device, comprising a positive electrode, wherein the positive electrode comprises a positive electrode material, wherein the positive electrode material comprises a lithium-nickel composite oxide;
- and an X-ray diffraction spectrum of the positive electrode material comprises a first diffraction peak, a second diffraction peak, and a third diffraction peak distributed sequentially from a low angle to a high angle in a range of 34° to 39°;
- and 0.25≤(a peak intensity of the second diffraction peak+a peak intensity of the third diffraction peak)/a peak intensity of the first diffraction peak≤0.5.
Dependencies are inferred from the claim text.