Sub-micron lithium nickel manganese oxide with truncated octahedral structure and preparation method thereof

Abstract

The invention belongs to the technical field of preparation technologies of inorganic advanced nanometer materials and particularly relates to a sub-micron lithium nickel manganese oxide with a truncated octahedral structure and a preparation method thereof. The lithium nickel manganese oxide is of a truncated octahedral structure, which is formed by a family of crystal planes {111} and a family of crystal planes {100}, and the size of the lithium nickel manganese oxide with the truncated octahedral structure is 300-800 nm; the preparation method of the sub-micron lithium nickel manganese oxide with the truncated octahedral structure comprises the following steps of sintering to obtain a precursor, namely manganic oxide, with manganese sulfate monohydrate and ammonium bicarbonate as raw materials, adding lithium salt and nickel salt, dropping ethanol, stirring, drying and sintering the mixture at high temperature to obtain a final product. The lithium nickel manganese oxide with the truncated octahedral structure is more beneficial for diffusion of lithium ions and promotion of cycling performance; the manganic oxide with the nano-particle aggregation is taken as the precursor to prepare the lithium nickel manganese oxide with the truncated octahedral structure, and the preparation method has the advantages of novelty, fewer steps, simple process and low cost.

Description

technical field [0001] The invention belongs to the technical field of preparation of advanced inorganic nanomaterials, and in particular relates to a method for preparing inorganic functional materials, in particular to a method for preparing lithium nickel manganese oxide with a submicron octahedral structure by co-deposition and sintering . Background technique [0002] Lithium-ion batteries have the advantages of high discharge voltage, high energy density, large specific capacity, and long cycle life, and have been widely used in portable electronic consumer products, electric vehicles, power tools, aerospace and other fields. Electric vehicles have the advantage of less environmental pollution. With the maturity of the electric vehicle market, traditional cathode materials can no longer meet the existing market demand. People put forward the following requirements for new electrode materials: high energy density, good cycle performance and low cost. [0003] Lithium ...

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Problems solved by technology

[0004] In order to further improve the electrochemical performance of lithium nickel manganese oxide with spinel structure, researchers have tried many modification methods, including: coating method, doping method and preparation of nanocrystalline particles. Coating method is usually used to improve the cycle of materials. Performance, but this will reduce the energy density of the material; doping is used to improve the rate performance of the material, but this method is complex and costly; nanocrystalline particles can improve the rate performance of the material, but this will reduce the Coulomb of the material efficiency

So far, there are few lithium nickel manganese oxide material configurations that can satisfy many advantages such as high energy density, long cycle life and low cost at the same time.

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