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

A technology of nickel-cobalt-lithium-manganese-manganate and cathode materials, which is applied in battery electrodes, electrochemical generators, structural parts, etc., can solve the problems of poor cycle performance of nickel-cobalt-lithium-manganese-oxide batteries, reduce electron residues, and reduce oxygen vacancies , the effect of inhibiting oxygen deficiency

Active Publication Date: 2020-10-16
GEM (HUBEI) NEW ENERGY MATERIALS CO LTD
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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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  • Niobium manganese modified tin oxide coated nickel cobalt lithium manganate positive electrode material and preparation method
  • Niobium manganese modified tin oxide coated nickel cobalt lithium manganate positive electrode material and preparation method

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[0017] The preparation method of the nickel cobalt lithium manganese oxide cathode material coated with niobium manganese modified tin oxide provided by the invention comprises the following steps:

[0018] Step S1, weighing tin oxide and niobium manganese oxide, mixing them and treating them at low temperature to obtain a niobium manganese tin oxide mixture.

[0019] Among the oxides of tin oxide and niobium manganese weighed in this step, the molar ratio of tin niobium manganese Sn:Nb:Mn=1:(0.1~0.3):(0.2~0.5), the range of low temperature treatment is 200-500°C . The tin oxide is tin monoxide or tin dioxide. The niobium-manganese oxide is a general term for various valence state oxides of niobium and manganese elements, and there are many choices, such as niobium oxide, niobium dioxide, niobium trioxide, and niobium pentoxide etc. Manganese oxide may be manganese monoxide, manganese dioxide, or the like.

[0020] Step S2, weighing the nickel-cobalt-manganese ternary mater...

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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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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/485H01M4/62H01M10/0525
CPCH01M4/366H01M4/485H01M4/505H01M4/525H01M4/624H01M4/628H01M10/0525Y02E60/10
Inventor 许开华许国干徐世国徐中领张玉军王星宁李伟刘钰
Owner GEM (HUBEI) NEW ENERGY MATERIALS CO LTD
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