Niobium and manganese modified tin oxide-coated lithium nickel cobalt manganate positive electrode material and preparation method thereof

Abstract

The invention is suitable for the technical field of a lithium battery, and provides a niobium and manganese modified tin oxide-coated lithium nickel cobalt manganate positive electrode material and apreparation method thereof. The method comprises the steps of S1, weighing tin oxide and a niobium and manganese oxide, performing low-temperature treatment after mixing to obtain a niobium and manganese tin oxide mixture; S2, weighing a nickel cobalt manganate ternary material, fully and uniformly mixing the nickel cobalt manganate ternary material and the niobium and manganese tin oxide mixtureto obtain a mixed material; and S3, loading the mixed material obtained in the step S2 to a sagger, and performing sintering to obtain the niobium and manganese modified tin oxide-coated lithium nickel cobalt manganate positive electrode material. The ternary positive electrode material is coated by employing niobium and manganese modified tin oxide, the surface structure of the material can be effectively protected, Ni<2+> generation is reduced, de-intercalation of lattice oxygen is effectively prevented, the cycle and rate performance of the material is improved, meanwhile, the side reaction brought by the defect of the tin oxide material also can be effectively reduced, and the material performance is more excellent.

Description

technical field [0001] The invention belongs to the technical field of lithium batteries, and in particular relates to a nickel-cobalt lithium manganate cathode material and a preparation method coated with niobium-manganese modified tin oxide. Background technique [0002] Nickel-cobalt-manganese ternary lithium-ion battery cathode materials are widely used in the new energy battery industry due to their high energy density and relatively low cost. Lithium nickel cobalt manganese oxide (LNCM), especially high-nickel products, has poor structural stability, and it is easy to cause the formation of lattice oxygen due to the deintercalation of Li ions and the change of valence states of Ni, Co, and Mn ions during charge and discharge. escape, causing the collapse of the material structure, and causing great harm to the cycle life and safety of the material; at the same time, the surface structure is easy to react with the electrolyte, Ni 3+ Easily reduced to Ni 2+ Inert vale...

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Problems solved by technology

[0003] In view of the above problems, the object of the present invention is to provide a nickel-cobalt-lithium-manganese-oxide positive electrode material coated with niobium-manganese-modified tin oxide and a preparation method, aiming at solving the technical problem of poor cycle performance of the existing nickel-cobalt-lithium manganate battery

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