Preparation method of manganous-manganic oxide and manganous-manganic oxide

A technology of trimanganese tetraoxide and manganese dioxide, which is applied in the direction of manganese oxide/manganese hydroxide, etc., can solve the problems of losing application value and the particle size distribution of manganese dioxide tail powder not meeting the requirements, so as to improve the appearance and improve the Efficiency, the effect of increasing the packing density
CN102765760AActive Publication Date: 2012-11-07SHENZHEN MODERN SKY TECH CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
SHENZHEN MODERN SKY TECH CO LTD
Publication Date
2012-11-07

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Abstract

The invention provides a preparation method of manganous-manganic oxide and the manganous-manganic oxide. The preparation method comprises the following steps of adjusting the pH value of manganese dioxide powder slurry to be 2.0-2.5, stirring the slurry at the temperature of 60-70 DEG C and conducting solid-liquid separation; adding manganese dioxide after scouring in manganese sulfate solution with the concentration of 100-200g / L; warming the solution at nitrogen atmosphere to the temperature in the scope of 55-60DEG C; leading in NH3 holding solution with the pH value in the scope of 7.5-8.0, and maintaining, stirring and reacting for 0.8-1.2 hours after the pH value of the holding solution is stable; replacing nitrogen atmosphere by using oxygen atmosphere, leading in NH3 holding solution with the pH value in the scope of 7.0-7.5, adding 250-350g / L of MnSO4 solution, reacting until concentration of Mn+ is smaller than 500ppm, stopping the reaction, conducting solid-liquid separation, washing solid phase, and drying to obtain globular Mn3O4 products. The preparation method can use electrolytic manganese dioxide (EMD) tail powder to serve as raw materials, obtained manganous-manganic oxide products are approximately spherical and high in purity, and requirements for lithium-ion secondary battery are met.
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Description

technical field

[0001] The invention relates to the preparation of a manganese-based basic material for a lithium-ion secondary battery, in particular to a method for preparing spherical trimanganese tetraoxide. Background technique

[0002] At present, lithium manganese oxide for power batteries is mainly prepared by solid-phase synthesis after the block EMD powder making process. In the block EMD powder making process, more manganese dioxide ultrafine powder will be produced. This part of the small particle manganese dioxide tail powder Because the particle size distribution does not meet the requirements, it loses its due application value.

[0003] In the preparation of manganese-based positive electrode materials for lithium-ion secondary batteries, trimanganese tetraoxide has become a promising manganese-based material due to its excellent physical and chemical properties. EMD tail powder is used to prepare spherical lithium-ion secondary batteries through various step...

Claims

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