Preparation method of monocrystal lithium manganate material

Abstract

The invention relates to the technical field of chemical power supplies, particularly to a preparation method of monocrystal lithium manganate material. The preparation method comprises the followingsteps: weighing raw materials including a manganese compound and sodium sulfate according to a required ratio, adding the raw materials into deionized water, performing stirring for 1 to 10h, performing reacting for 10 to 15h at a temperature of 100 to 150 DEG C, performing cooling and filtering, collecting precipitates, performing washing for 1 to 5 times by using the deionized water, and performing drying, so as to obtain a beta-MnO2 precursor; mixing the obtained beta-MnO2 precursor with a lithium source and a compound doped with an element M according to a certain proportion, and performing sintering to obtain a finished product; and the molecular formula of the finished product is Li 1+aMn2-a-bMbO4, a is greater than or equal to 0 and less than or equal to 0.2, b is greater than or equal to 0 and less than or equal to 0.2, and the doping element M is one or more of Al, Ti, Zr, Si, Zn, Mg, Ga, B, Cr, Co and Y. The preparation method has the beneficial effects that beta-MnO2 is synthesized through a hydrothermal method to serve as a precursor, then the beta-MnO2 precursor, a lithium source and a doped element compound are mixed and sintered to obtain the monocrystal lithium manganate material, and the lithium manganate material has the advantages of being small in gap, high in compaction density, good in rate capability, high in initial discharge and cycle performance and the like.

Description

Technical field [0001] The invention relates to the technical field of chemical power sources, in particular to a method for preparing a single crystal lithium manganate material. Background technique [0002] Lithium manganate (LiMn2O4) is used as a positive electrode material for lithium-ion batteries. In recent years, because of its safety and environmental friendliness, it has been widely used in electric batteries. [0003] At present, the industrially produced lithium manganese oxides are all secondary particles formed by agglomeration of small-sized primary particles. The primary small crystal grains are smaller in size and have more crystal defects. The diffusion and migration of Li+ are more hindered, and the product shows pressure The real density is not high, the rate performance and the cycle performance are not good. [0004] Chinese Patent No. CN102259931B provides a method for preparing lithium manganate battery materials, which includes the following steps: (1) Disso...

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Problems solved by technology

[0006] The object of the present invention is to provide a kind of preparation method of single crystal lithium manganese oxide material, to solve the problem that the lithium manganate proposed in the above-mentioned background technology is a secondary particle formed by agglomeration of small-sized primary particles. Small, with many crystal defects, Li+ diffusion and migration are more hindered, the product shows low compaction density, poor rate performance and cycle performance, etc.

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