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Spherical manganese dioxide and its preparation method

A manganese dioxide, spherical technology, applied in the direction of manganese oxide/manganese hydroxide, etc., can solve the problems of insufficient particle size, increase the content of elemental iron in manganese dioxide powder, uneven appearance of manganese dioxide powder, etc., and achieve product impurities Low cost, low cost, excellent electrochemical charge and discharge performance

Active Publication Date: 2012-02-22
GUIZHOU DALONG HUICHENG NEW MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] At present, domestically, Raymond mill is mainly used for the pulverization of electrolytic manganese dioxide. The processed manganese dioxide powder has uneven appearance, irregular block shape, and insufficient particle size, which cannot meet the requirements of lithium manganese oxide. Material requirements, and Raymond mill will increase the content of elemental iron in manganese dioxide powder when pulverized

Method used

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  • Spherical manganese dioxide and its preparation method
  • Spherical manganese dioxide and its preparation method
  • Spherical manganese dioxide and its preparation method

Examples

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Effect test

Embodiment 1

[0032] a kind of like Figure 1 ~ Figure 3 The spherical-like manganese dioxide shown in the present invention has a median particle size of 18.5 μm, has a γ-type crystal structure microscopically, and has a Fe content of 26 ppm.

[0033] The quasi-spherical manganese dioxide of the present embodiment is mainly prepared by the following methods:

[0034] Weigh 40kg of the manganese dioxide crude product after electrolysis, and use the jaw crusher to crush the manganese dioxide crude product after electrolysis in the first step. After the first step of crushing, manganese dioxide with an average diameter of about 11.5mm is obtained Coarse particles; then use the roller crusher to carry out the second step of crushing the manganese dioxide coarse particles after the first step of crushing, and after the second step of crushing, obtain the manganese dioxide fine particles with an average diameter of about 500 μm; The manganese dioxide fine particles after the roll are evenly add...

Embodiment 2

[0037] a kind of like Figure 4 ~ Figure 6 The spherical-like manganese dioxide shown in the present invention has a median particle size of 15 μm, has a γ-type crystal structure microscopically, and has a Fe content of 25 ppm.

[0038] The quasi-spherical manganese dioxide of the present embodiment is mainly prepared by the following methods:

[0039] Weigh 30kg of the manganese dioxide crude product after electrolysis, and use a jaw crusher to crush the manganese dioxide crude product after electrolysis in the first step. After the first step of crushing, manganese dioxide with an average diameter of about 12.0mm is obtained. Coarse particles; then use the roller crusher to carry out the second step of crushing the manganese dioxide coarse particles after the first step of crushing, and after the second step of crushing, obtain the manganese dioxide fine particles with an average diameter of about 500 μm; The manganese dioxide fine particles after the roll are evenly added to...

Embodiment 3

[0042] a kind of like Figure 7 ~ Figure 9 The spherical-like manganese dioxide shown in the present invention has a median particle size of 5 μm, has a γ-type crystal structure microscopically, and has a Fe content of 28 ppm.

[0043] The quasi-spherical manganese dioxide of the present embodiment is mainly prepared by the following methods:

[0044] Weigh 30kg of the manganese dioxide crude product after electrolysis, and use the jaw crusher to crush the manganese dioxide crude product after electrolysis in the first step. After the first step of crushing, manganese dioxide with an average diameter of about 13.0mm is obtained Coarse particles; then utilize the roller crusher to carry out the second step of crushing the manganese dioxide coarse particles after the first step of crushing, after the second step of crushing, obtain the manganese dioxide fine particles with an average diameter of 300 μm; The manganese dioxide fine particles after the roll are evenly added to the...

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Abstract

The invention discloses a kind of spherical manganese dioxide and a preparation method thereof. The median particle diameter of the kind of spherical manganese dioxide is 3-25 μm, and the microscopic structure of the kind of spherical manganese dioxide has a γ-type crystal structure. The preparation includes The following steps: first crush the manganese dioxide coarse product after electrolysis until the manganese dioxide fine particles with an average diameter of 300-800 μm are obtained, and then perform dry ball milling on the manganese dioxide fine particles, and the ball milling medium is alumina balls Or zirconia balls until spherical manganese dioxide with a median particle size of 3-25 μm is obtained. The manganese dioxide of the present invention not only has a smaller particle size and a smaller specific surface area, but also has a shape closer to a spherical shape. The preparation method of the present invention has low cost, low energy consumption and convenient operation. is of great significance.

Description

technical field [0001] The invention relates to a manganese compound and a preparation method thereof, in particular to a manganese oxide and a preparation method thereof. Background technique [0002] Spinel lithium manganese oxide (LiMn 2 o 4 ) has the advantages of rich resources, low cost, no pollution, high voltage, can withstand high current charge and discharge, and good safety, so it is considered to be one of the most promising positive electrode materials for the new generation of lithium-ion batteries, but the capacity decays quickly The disadvantages become a serious obstacle to its application. At present, people are mainly working on improving their cycle stability from the aspects of optimizing the synthesis process, doping different elements, surface modification and finding a suitable electrolyte. In fact, the morphology of lithium manganate is also closely related to its electrochemical performance. The more complete the spherical morphology, the smaller...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G45/02
Inventor 彭天剑
Owner GUIZHOU DALONG HUICHENG NEW MATERIAL CO LTD
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