Preparation method of high-capacity layered lithium-rich manganese-based oxide

Abstract

The invention relates to a preparation method of a high-capacity layered lithium-rich manganese-based oxide, and the method is characterized by comprising the following steps: a) fully mixing a nickel-containing compound, a manganese-containing compound I and a cobalt-containing compound with a solvent so as to get a solution or suspension; b) adding a precipitator into the solution or suspension obtained in the step a), and filtering to obtain a precipitate; c) drying the precipitate obtained in the step b) so as to get a precursor; d) uniformly mixing the precursor obtained in the step c), a manganese-containing compound II, a doping element M-containing compound and a lithium-containing compound in proportion so as to get mixed powder; and e) performing heat treatment on the mixed powder obtained in the step d) so as to get an ultrahigh-capacity manganese series lithium transition metal compound oxide with an expression of Li(Li0.2Mn0.8-delta-alpha-beta-Ni alpha Co beta M delta)O2. Compared with the prior art, the preparation method provided by the invention has the advantages of high utilization rate of raw materials and low production cost, and the prepared lithium-rich manganese-based oxide has the advantages of excellent charge-discharge performance and excellent cycle performance.

Description

technical field [0001] The invention relates to the technical field of cathode materials for lithium ion batteries, in particular to a method for preparing a high-capacity layered lithium-rich manganese-based oxide. Background technique [0002] At present, layered lithium cobalt oxide, spinel lithium manganese oxide and olivine lithium iron phosphate materials have been widely used in lithium-ion battery cathode materials, but these cathode materials usually have a discharge specific capacity of 100-160mAh / g, corresponding to The energy density of lithium-ion batteries is low, which cannot solve the problems of heavy weight and short cruising range of electric vehicles. Therefore, in order to meet the needs of pure electric or hybrid electric vehicles, it is urgent to develop battery materials with superior properties such as high capacity, low cost, and good thermal stability. [0003] Layered lithium-rich manganese-based oxide cathode material Li[Li 0.2 mn 0.8-δ-α-β Ni...

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Problems solved by technology

[0008] The technical problem to be solved by the present invention is to provide a reaction condition that is easy to control and the metal ion mixing and metal ion quantity ratio in the precipitation material in the preparation process are consistent with the stoichiometric ratio of each reaction material in view of the current situation of the prior art. A method for preparing high-capacity layered lithium-rich manganese-based oxides, thereby solving the problem of low use efficiency of raw materials for the preparation of layered lithium-rich manganese-based oxide precursors by liquid phase coprecipitation, and further reducing production costs

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