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Spherical manganic manganous oxide and its preparation method

A technology of trimanganese tetraoxide and spherical shape, which is applied in the direction of manganese oxide/manganese hydroxide, etc. It can solve the problems of small specific gravity, inability to use lithium manganese oxide, high impurity content, etc., to achieve enhanced application, improved cycle performance and high temperature performance , The effect of simple process

Active Publication Date: 2012-06-13
贵州大龙汇成新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For example, manganese tetraoxide is used as a magnetic material produced by air oxidation of metal manganese powder under ammoniacal conditions. Its microscopic appearance is flocculent, its apparent specific gravity is small, and its tap density is about 1.2g / cm 3 , with high impurity content (iron impurity up to 0.2%), it cannot be used in the production of lithium manganate at all

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  • Spherical manganic manganous oxide and its preparation method
  • Spherical manganic manganous oxide and its preparation method
  • Spherical manganic manganous oxide and its preparation method

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Embodiment 1

[0034] a kind of like figure 1 The spherical trimanganese tetraoxide of the present invention shown, the D of the spherical trimanganese tetraoxide 50 The particle size is 11.5μm, and the tap density is 2.2g / cm 3 .

[0035] Prepare 10L of manganese sulfate solution with a divalent manganese ion concentration of 60g / L with pure water, then weigh 40g of absolute ethanol and add it to the manganese sulfate solution and stir evenly; prepare a sodium hydroxide solution with a concentration of 120g / L with pure water 10L, weigh 160g of ammonia water with a mass fraction of 25% and add it to the sodium hydroxide solution and stir evenly; according to the flow rate of manganese sulfate 500ml / h and the molar ratio of manganese ions and sodium hydroxide as 1:2, use a metering pump Add manganese sulfate solution and sodium hydroxide solution into a stirred reactor with a volume of 8L, control the reaction temperature to 60°C, and the pH value of the reaction solution to 10, and at the s...

Embodiment 2

[0038] a kind of like figure 2 The spherical trimanganese tetraoxide of the present invention shown, the D of the spherical trimanganese tetraoxide 50 The particle size is 7.1μm, and the tap density is 2.1g / cm 3 .

[0039] Use pure water to prepare 10L of manganese sulfate solution with a divalent manganese ion concentration of 90g / L, weigh 36g of disodium EDTA and 10.6g of sodium fluoride, add them to the manganese sulfate solution and stir evenly; prepare a concentration of 200g / L with pure water 10L of sodium hydroxide solution, according to the flow rate of manganese sulfate 500ml / h and the molar ratio of manganese ions and sodium hydroxide as 1:2, add manganese sulfate solution and sodium hydroxide solution to the reactor with a volume of 8L by metering pump In the process, the temperature of the reaction is controlled at 70°C, the pH of the reaction solution is 9.5, and at the same time, a sufficient amount of air is passed to oxidize the precipitate, and the product ...

Embodiment 3

[0042] A kind of spherical trimanganese tetraoxide of the present invention, the D of the spherical trimanganese tetraoxide 50 The particle size is 10.1μm, and the tap density is 2.2g / cm 3 .

[0043] Use pure water to prepare 20L of manganese nitrate solution with a divalent manganese ion concentration of 145g / L, weigh 38g disodium EDTA and 20g ethylene glycol and add them to the manganese nitrate solution and stir evenly; then use pure water to prepare a concentration of 200g / L 30L of sodium hydroxide solution, add 60g of ethylenediamine and stir evenly; according to the flow rate of manganese nitrate 500ml / h and the molar ratio of manganese ions and sodium hydroxide as 1:2, the manganese nitrate solution and hydroxide Add the sodium solution into a stirred reactor with a volume of 8 L, control the reaction temperature to 70°C, and control the pH value of the reaction solution to 10, and at the same time pass a sufficient amount of air to oxidize the precipitate, and the pro...

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Abstract

The invention discloses spherical manganic manganous oxide and its preparing method. The spherical manganic manganous oxide has a particle size D50 ranging from 5 micrometers to 20 micrometers and a tap density of greater than or equal to 2.0g / cm<3>. The preparation method of the spherical manganic manganous oxide comprises the steps of: weighing a soluble manganese salt of bivalent manganese, and preparing a manganese salt solution; weighing sodium hydroxide, which is then prepared into a sodium hydroxide solution; adding the obtained manganese salt solution and the sodium hydroxide solution into a reactor continuously according to a mole ratio of manganese ions to sodium hydroxide of (0.5-1.5): 2 for a precipitation reaction, controlling the reaction temperature at 40DEG C-80DEG C and the pH value of the reaction solution at 7.5-13.5, and simultaneously adding an oxidizing agent for oxidation treatment of a generated precipitate; separating an oxidation product, then conducting rinsing and drying, thus obtaining the spherical manganic manganous oxide, which has the advantages of low impurity content, optimized microstructure, high tap density, and good quality, etc.

Description

technical field [0001] The invention relates to a manganese oxide and a preparation method thereof, in particular to trimanganese tetraoxide particles and a preparation method thereof. Background technique [0002] Lithium-ion batteries, as a new generation of high-energy green batteries, have been successfully used in low-power fields such as mobile communications and notebook computers, and have successfully achieved medium-power applications in electric bicycles. Soon, they will be widely used in high-power electric vehicles. . [0003] Lithium manganese oxide is an important cathode material for lithium-ion batteries. It is used in lithium-ion batteries and has the advantages of abundant resources, cheap materials, good safety, and no pollution to the environment. However, the current lithium manganate products have problems such as low capacity, poor cycle performance, and poor high-temperature performance, which are mainly due to the inherent defects of its raw materi...

Claims

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Application Information

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IPC IPC(8): C01G45/02
Inventor 刘务华胡瑶陈湘香高智彭天剑申喜元唐素娟
Owner 贵州大龙汇成新材料有限公司
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