Preparation method of lithium manganate with low specific surface area and large particle size

Abstract

The invention discloses a preparation method of lithium manganate with low specific surface area and large particle size. The method comprises the following steps: (1) mixing Li and M, and carrying out high-speed ball milling to obtain a uniform mixture A; (2) dissolving a lithium salt and a manganese salt in an ethanol solvent, and adjusting the mixture to a sol state by using ammonia water to obtain a lithium manganate sol B; (3) uniformly mixing and stirring the mixture A, the lithium manganate sol B and manganese oxide C, and performing spray drying to obtain a mixture D; and (4) sintering the mixture D at high temperature to obtain the lithium manganate material. According to the invention, the compounds of Li and the doping element M are subjected to refining treatment, so that the subsequent distribution is more uniform; and after refining treatment, the refined compounds are mixed with the micron-sized manganese oxide and the lithium manganate sol, and drying and high-temperature calcinating are carried out, so that the average particle size can be controlled to be 15-25 microns, the crystal grains are complete, and the cycle performance is excellent.

Description

technical field [0001] The invention belongs to the technical field of positive electrode materials of lithium ion batteries, and relates to a preparation method of lithium manganate with low specific surface area and large particle size. Background technique [0002] At present, the commonly used cathode materials are lithium cobaltate, lithium manganate, nickel cobalt lithium manganate, lithium iron phosphate, etc. Because cobalt is expensive, and lithium cobalt oxide and lithium nickel cobalt manganese oxide are used in power batteries, there are great potential safety hazards. Lithium manganese oxide and lithium iron phosphate are ideal cathode materials for lithium-ion power batteries. Although the lithium manganese oxide material has low cost and good safety performance, its specific capacity is relatively low, and due to the dissolution of Mn, the Jahn-Teller distortion effect and the instability of the crystal lattice, the cycle life, especially the high-temperature...

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved in the present invention is to overcome the defect of unsatisfactory cycle performance of lithium manganate in the prior art at high temperature, and to provide a preparation method of lithium manganate with low specific surface area and large particle size

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