a doped al 3+ Preparation method of lithium nickel manganese oxide material with regular octahedral morphology

Abstract

The invention discloses a preparation method of an Al<3+>-doped regular-octahedron-shaped lithium nickel manganese oxide material. The method is characterized by, accurately weighing an aluminium source, a manganese source, a nickel source and a lithium source according to stoichiometric ratio; mixing the weighed manganese source, the nickel source and Al2O3 and carrying out ball milling; drying the mixture obtained after ball milling into powders; weighing oxalic acid powders and mixing the oxalic acid powders with the mixture dried into powders; adding PEG into the obtained mixture, carryingout stirring to obtain grey-black colloidal mixture, and preheating the grey-black colloidal mixture to obtain black precursor powders; mixing and ball milling the obtained black precursor powders and the weighed lithium source; and keeping the obtained mixture for 5-24 h under the temperature of 800 DEG C, and then, reducing the temperature to less than 600 DEG C and keeping the mixture for 5-24h and then, carrying out annealing to reach room temperature to obtain a submicron-level Al<3+>-doped regular-octahedron-shaped lithium nickel manganese oxide material. The method obtains the Al<3+>-doped regular-octahedron-shaped lithium nickel manganese oxide material by combining a low-cost high-temperature solid phase method and a polymer auxiliary method; and the material is high in cost performance.

Description

technical field [0001] The present invention relates to a kind of preparation method of material, specifically a kind of doping Al 3+ A preparation method of lithium nickel manganese oxide material with regular octahedral morphology. Background technique [0002] At present, the new type of clean energy has attracted wide attention, and lithium-ion batteries have gradually attracted great attention due to their advantages such as high specific capacity, high energy density, good charge-discharge cycle performance, small size and light weight. As a relatively important part of the four major elements of lithium-ion batteries, the cathode material accounts for 40% of the market and is also the top priority of research. Among them, lithium nickel manganese oxide (LNMO) material has become a research hotspot in positive electrode materials due to its advantages such as high potential, large discharge window, and low cost. Although the specific capacity of LNMO is theoretically...

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Problems solved by technology

The invention of patent number CN201710998751.0 introduces a method of doping lithium nickel manganese oxide, but because the doping process is cumbersome, the cost of the liquid phase method is high, and the performance of the obtained material has not been significantly improved, so it is not suitable Used for the modification of lithium nickel manganese oxide

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