Lithium ion battery anode material layered lithium manganese oxide and manufacturing method thereof

Abstract

The invention discloses a lithium ion battery anode material layered lithium manganese oxide and a manufacturing method thereof, wherein the general formula of the lithium ion manganese oxide is LiMn(1-x)MxO2 (wherein M is one or more of Ni, Co, Al, Cr and the like, x is not less than 0 and not more than 0.05 and another x is more than 0.05 and is not more than 0.15). The manufacturing method comprises the following two steps of: manufacturing a precursor (Mn1-xMx)2O3 and manufacturing a layered lithium manganese oxide. According to the manufacturing method disclosed by the invention, the advantages of a solid phase method and a wet method are combined, materials can be mixed according a stoichiometric ratio and can be also mixed at a low temperature under a condition of needing protection of a little inert gas, and products are regulated to be of an orthogonal structure (x is not less than 0 and not more than 0.05) or a monocline structure (x is more than 0.05 and is not more than 0.15) by controlling the content of doped elements; the products manufactured by the method disclosed by invention have an integral layered structure, the sizes of crystalline grains can be controlled at nanometer level, first discharge capacity is high, capacity activation circulation times can be reduced to 2-3 times, and circulation service life is long.

Description

technical field [0001] The invention relates to a positive electrode material for a battery, in particular to a layered lithium manganese oxide, a positive electrode material for a lithium ion battery, and a preparation method thereof, belonging to the technical field of lithium ion battery material preparation. Background technique [0002] LiMnO with layered structure 2 (orthogonal LiMnO 2 and monoclinic LiMnO 2 ) used as a cathode material for lithium-ion batteries has the following advantages: 1. High specific capacity (theoretical capacity is 285mAh / g, and the actual capacity can reach about 250 mAh / g—more than LiCoO 2 1.5 times of that); 2, good safety; 3, rich in resources, low in price, and low in toxicity; its main disadvantage is that it is difficult to prepare. [0003] At present, there are mainly two types of preparation methods for layered lithium manganate: solid-phase method and wet method (hydrothermal method, sol-gel method, etc.). , but during the prep...

AI Technical Summary

Problems solved by technology

[0002]LiMnO2 with layered structure (orthorhombic LiMnO2 and monoclinic LiMnO2) used as a cathode material for lithium-ion batteries has the following advantages: 1. High specific capacity (theoretical capacity is 285mAh / g, and the actual capacity can reach about 250 mAh / g—more than LiCoO2 1.5 times); 2, good safety; 3, rich in resources, low in price, and low in toxicity; its main disadvantage is that it is difficult to prepare

[0003]At present, there are two main methods for preparing layered lithium manganate: solid-phase method and wet method (hydrothermal method, sol-gel method, etc.), solid-phase The method can carry out ingredients according to the required stoichiometric ratio, and is suitable for industrial scale production, but in the preparation process, inert gas must be continuously introduced for protection, and the air pressure is not easy to control; the preparation temperature must be above 700 ° C, the calcination time is long, and the energy consumption is high. The product has large grains (micron scale), poor consistency, and the initial discharge specific capacity of the material is low, and the number of capacity activation cycles is large; the advantages of the wet method are: low reaction temperature, easy control of grain growth, and relatively low initial capacity of the material. High, but the preparation process requires a lot of water for cleaning, and the Li is too much, which is a serious waste

Images