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Lithium manganate composite manganous-manganic oxide and industrial preparation method thereof

A three manganese tetroxide, composite technology, applied in chemical instruments and methods, manganese oxide/hydroxide, manganate/permanganate, etc., can solve problems such as incomplete oxidation, and avoid lattice oxygen. Defects, the effect of improving product performance and consistency

Active Publication Date: 2018-05-22
SINOSTEEL ANHUI TIANYUAN TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The object of the present invention is to, in view of the above problems, provide a kind of compound manganese tetraoxide for lithium manganate and its industrial preparation method, which can avoid the occurrence of incomplete oxidation in the sintering process

Method used

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  • Lithium manganate composite manganous-manganic oxide and industrial preparation method thereof
  • Lithium manganate composite manganous-manganic oxide and industrial preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The high-purity metal manganese flakes are crushed to a median particle size of 250 μm by a roller machine, and the manganese powder above 350 μm is removed after being sieved by a vibrating sieve, and then mixed with a double-cone mixer for 2 hours, and 1000 kg of the above manganese powder is added to the 4m 3 In the reactor of pure water and 100kg ammonium sulfate, the air is oxidized, and the gas volume is controlled at 300m 3 / h, the stirring speed is controlled at 400r / min, after reacting at room temperature for 20h, add 600kg manganese chloride, add 800kg NaHCO after stirring for 10min 3 Continue to react for 3 hours, after the reaction finishes, the slurry is washed (Cl - Content<500ppm), after drying, trimanganese tetraoxide particles coated with manganese carbonate are obtained. Then the trimanganese tetraoxide is roasted in the air at 350° C. for 3 hours until the reaction is completed to obtain a composite trimanganese tetraoxide product 1 coated with mang...

Embodiment 2

[0030] Use a ball mill to crush the high-purity manganese metal flakes to a median particle size of 150 μm, remove the manganese powder above 200 μm after sieving through a vibrating screen, and then mix it with a double-cone mixer for 2 hours, then take 1000 kg of the above manganese powder and put it into 5m 3 In the reactor of pure water and 100kg ammonium chloride, the air is oxidized, and the gas volume is controlled at 200m 3 / h, the stirring speed is controlled at 300r / min, after reacting at room temperature for 20h, add 500kg manganese chloride, add 700kg NaHCO after stirring for 10min 3 Continue to react for 3 hours, after the reaction finishes, the slurry is washed (Cl - Content<500ppm), after drying, trimanganese tetraoxide particles coated with manganese carbonate are obtained. Then this trimanganese tetraoxide is roasted in the air at 350° C. for 3 hours until the reaction is completed to obtain a composite trimanganese tetraoxide product 2 coated with manganese ...

Embodiment 3

[0035]The high-purity metal manganese flakes are crushed to a median particle size of 20 μm by a mechanical pulverizer, and the manganese powder above 80 μm is removed after being sieved by a vibrating screen. 6m 3 In the reactor of pure water and 100kg ammonium chloride, the air is oxidized, and the gas volume is controlled at 100m 3 / h, the stirring speed is controlled at 200r / min, after reacting at room temperature for 20h, add 250kg manganese chloride, add 350kg NaHCO after stirring for 10min 3 Continue to react for 3 hours, after the reaction finishes, the slurry is washed (Cl - Content<500ppm), after drying, trimanganese tetraoxide particles coated with manganese carbonate are obtained. Then this trimanganese tetraoxide is roasted in air at 350° C. for 3 hours until the reaction is completed, and the composite trimanganese tetraoxide product 3 coated with manganese dioxide is obtained. Among the composite trimanganese tetraoxide products prepared by this method The bi...

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Abstract

The invention discloses lithium manganate composite manganous-manganic oxide and an industrial preparation method thereof. The method comprises the following steps: crushing high-purity manganese metal powder till the particle size of 10-300mu m by using a dry method, grading the manganese metal powder by using grading equipment, putting into a reactor with pure water and an ammonium salt, introducing air for oxidation, stirring at a speed of 100-500r / minute, introducing air at a flow of 100-300m<3> / hour, reacting for 20-25 hours, adding dissoluble manganese salt, sufficiently stirring, further adding bicarbonate, continuously reacting for 3-5 hours till the reaction is completed, further washing, drying, and roasting, thereby obtaining a composite manganous-manganic oxide product. The composite manganous-manganic oxide prepared by using the method is prevented from lithium manganate lattice oxygen defects, product properties and consistence are improved, meanwhile the amount of blownair is reduced, and the energy consumption of a kiln is reduced.

Description

technical field [0001] The invention belongs to the technical field of lithium battery cathode material preparation, and in particular relates to a compound trimanganese tetraoxide for lithium manganate and an industrial preparation method thereof. Background technique [0002] Lithium manganate (LiMn 2 o 4 ) with its rich raw materials, good cost performance, good environmental protection and safety performance, has gradually shown its unique advantages in today's high price of lithium battery cathode materials. [0003] Although the current domestic industrial production of lithium manganese oxide (LiMn 2 o 4 ) is mainly electrolytic manganese dioxide (EMD), but there have been new researches (see literature 1 Chen Shoubin, Wu Xianming, Chen Shang, Liu Zhixiong, Ding Qichen. Preparation of spinel lithium manganese oxide and its electrochemical properties by trimanganese tetraoxide Research, [J]. Applied Chemical Industry, 2015,44(10):1791-1795.; Literature 2 Qin Wei, W...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G45/02C01G45/12H01M4/36H01M4/505H01M10/0525
CPCC01G45/02C01G45/1242C01P2004/61C01P2006/40H01M4/366H01M4/505H01M10/0525Y02E60/10
Inventor 王志鹏杨洋陈思学王以存鲁俊
Owner SINOSTEEL ANHUI TIANYUAN TECH
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