Preparation method of modified lithium manganate cathode material

Abstract

The invention relates to a preparation method of a modified lithium manganate cathode material. The preparation method of the modified lithium manganate cathode material comprises the following steps:preparing a mixed solution of lithium acetate, chromium acetate, nickel acetate and manganese acetate, adding resorcinol into the mixed solution, stirring and adding a formaldehyde solution after theresorcinol is completely dissolved; putting the solution into constant-temperature water bath and performing reaction to form gel; drying and pre-sintering the gel; conveying the pre-sintered productto an airflow grinding machine, grinding, sintering for the second time, grinding again, and collecting the powder obtained after secondary grinding to obtain nickel-chromium doped modified lithium manganate. The phase purity of the product can be improved through presintering, and the crystallization property, the specific discharge capacity and the energy density of the material can be improvedthrough secondary sintering; the electrochemical properties of the material are improved through reasonable proportion of the raw materials; meanwhile, a roasting chamber and the airflow grinding machine are adopted, so that automatic production of presintering, grinding and secondary sintering can be realized, and the production efficiency is greatly improved.

Description

Technical field [0001] The invention relates to the preparation of lithium manganate cathode materials, in particular to a method for preparing modified lithium manganate anode materials. Background technique [0002] Lithium manganate has become the first choice for positive electrode materials for power lithium-ion batteries due to its rich manganese resources, low cost, good safety, no environmental pollution, and easy preparation. However, the main reason that hinders the formation of the industrialization capacity of power battery lithium manganate is Its performance is not stable enough, that is, its capacity decays quickly during the charge and discharge cycle, especially at high temperatures. The main factors affecting the cycle performance are: 1. The purity and stability of the phase structure, and the irregular micro-morphology; 2. The Jahn-Teller effect of the material itself; 3. The dissolution of manganese in the lithium manganate material. The current main measure...

AI Technical Summary

Problems solved by technology

The existing preparation process is complicated, the cost is high, and the degree of automation is low