| abstract |
A cathode material, containing a crystal with a superlattice structure, is provided. A chemical formula of the crystal is xLi<sub>2</sub>MO<sub>3</sub>·(1-x)LiNi<sub>a</sub>Co<sub>b</sub>Mn<sub>(1-a-b)</sub>O<sub>2</sub>, 0<x≤0.1, 0.8 ≤a<1, b≤0.1, and M is selected from Mn, Co, and Ni. A preparation method of the cathode material and a battery or a capacitor containing the cathode material are also provided. The cathode material contains a crystal with a layer-layer superlattice structure, which intersperses another layered structure on a high-nickel ternary material in a layered structure to improve the structural stability of the product using two different layered structures interlocking with each other. The cathode material dilutes the nickel content in the product by adding a lithium-rich phase. The reduction of nickel content effectively improves the gas production of the battery. Therefore, the present application improves the safety performance of the battery due to reduced gas production and stable cathode structure. |