A kind of manganese trioxide micropowder and its preparation method and application

Abstract

The invention discloses manganese trioxide micropowder. The Mg content is below 100ppm, and the sulfate radical content is below 500ppm; the preparation method is as follows: under a certain temperature and stirring conditions, continuously add a manganese salt solution and oxalic acid, and continuously add ammonia water or oxalic acid when the pH value is lower than 5.0. ammonium bicarbonate to maintain the reaction system in weak acidity; when the addition of the reaction solution is completed and the pH value rises to near neutrality, keep stirring until the reaction is complete; finally, the product is subjected to solid-liquid separation, rinsed several times, then roasted and cooled , Pulverize and sieve to get the product. The manganese trioxide micropowder of the invention is fine and uniform, has controllable particle size, low impurity content and high purity, and can be used as a precursor to prepare lithium manganate or soft ferrite for lithium ion batteries.

Description

technical field [0001] The invention belongs to the technical field of new materials, and relates to an oxide micropowder material and a preparation method thereof, in particular to a manganese trioxide micropowder for lithium ion batteries or soft magnetic ferrite and a preparation method thereof. Background technique [0002] Manganese oxide has many uses, among which, the preparation of lithium-ion battery materials and magnetic materials is an important application in the field of modern new energy and new electronic materials. [0003] Lithium manganese oxide is one of the candidate materials for power batteries for new energy vehicles due to its abundant resources and low price. At present, the production of lithium manganese oxide is generally made of electrolytic manganese dioxide as raw material, which is mixed with lithium carbonate and then roasted. However, the production of electrolytic manganese dioxide is to obtain a block on the anode by electrolyzing mangane...

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Problems solved by technology

Accordingly, when electrolytic manganese dioxide is used as a precursor to prepare lithium manganate, there will be the following three problems: 1) The cost is high, for example, the electricity consumption in the electrolysis process needs to be 8000 kWh / ton, and the crushed The selection will result in a large proportion of waste of raw materials; 2) The morphology, specific surface area, particle size and distribution of powder materials cannot be effectively controlled, which will further affect the electrochemical performance of lithium manganate materials; 3) High impurity content , for example, the sulfate radical content contained in the product is generally as high as 1.3%, and elemental iron will be brought in during the crushing process, which will have a negative impact on the safety performance of lithium-ion battery products

[0006] Most of the existing manganese trioxide is prepared by roasting manganese salts such as manganese oxalate and manganese carbonate, but the commercially available manganese oxalate is generally prepared by the reaction of manganese salt and sodium oxalate, which has high sodium content and many impurities; Manganese is generally produced by the direct reaction of manganese sulfate and ammonium bicarbonate, etc., but the obtained manganese carbonate product has fluffy and relatively coarse particles, is not easy to rinse clean, and contains more sulfate radicals; it can be seen that the manganese salt roasted by the above Manganese cannot meet the requirements of modern lithium-ion battery materials and magnetic materials

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