Preparation method of modified lithium nickel manganese oxide

Abstract

The invention discloses a preparation method of modified lithium nickel manganese oxide. The preparation method of the modified lithium nickel manganese oxide comprises the following steps: adding LiMnO4 and nickel acetate in pure water, stirring and dissolving at a normal temperature, and then carrying out spray drying to obtain a mixture; reacting, calcining the mixture in a roller furnace, feeding air in a calcining process, and carrying out cooling to obtain a cooled material; adding lithium acetate, lanthanum acetate, vanadium acetate, titanium dioxide and aluminum oxide in the cooled material, then pulpfying, levigating, and carrying out spray drying to obtain a second mixture; placing the second mixture in the roller furnace and carrying out secondary combustion, and after pulverizing the second mixture through air flow, carrying out sieving, iron removal and blending to obtain the modified lithium nickel manganese oxide. The preparation process is simple, the production efficiency is high, preparation of the lithium nickel manganese oxide can be realized, in a production process, molecular mixing of nickel, manganese and lithium is realized, the modified lithium nickel manganese oxide is obtained finally and is a gradient modified material, and the modified lithium nickel manganese oxide is high in capacity, good in cycle performance and good in high-temperature property.

Description

technical field [0001] The invention relates to a preparation method of modified lithium nickel manganese oxide, which belongs to the technical field of new energy lithium battery materials. Background technique [0002] Spinel-type lithium nickel manganese oxide is developed on the basis of spinel-type lithium manganese oxide. Like lithium manganate, it is a positive electrode material with three-dimensional lithium ion channels. The reversible capacity is 146.7mAh / g. It is almost the same, but the voltage platform is about 4.7V, which is more than 15% higher than the 4V voltage platform of lithium manganate, and the cycle stability at high temperature is also qualitatively improved compared with the original lithium manganate. [0003] Lithium nickel manganese oxide belongs to inorganic metal composite oxides, so the synthesis methods of general inorganic materials can be used to synthesize lithium nickel manganese oxide, such as solid phase method (ball milling method), c...

AI Technical Summary

Problems solved by technology

In various routes of preparing lithium nickel manganese oxide by sol-gel method, the key lies in the sol formation method and the stability of the sol. In addition, the general sol-gel method has the problems of complicated operation and expensive raw material reagents, so it can be The inability to find a simple and cheap sol-gel synthesis route has become a restricting factor for its industrial production

Another problem is that although the sol-gel method can ensure the uniform mixing of raw material precursors, the traditional sol-gel method has different sol formation conditions for different metal ions

On the one hand, lithium nickel manganese oxide belongs to the composite oxide of three metal elements (lithium, nickel, manganese), and it is difficult to realize the uniform mixing of various raw material components by conventional methods in synthesis, which affects the application market of lithium nickel manganese oxide. internal needs

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