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A kind of preparation method of lithium manganate battery material

A lithium manganate battery and manganese source technology, applied in the direction of manganate/permanganate, etc., can solve the problems of incomplete precipitation of lithium salt, difficulty in industrial production, and production of by-products, etc., to achieve uniform particle size and excellent performance , to avoid the effect of reunion

Inactive Publication Date: 2011-11-30
姚金翰 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although these synthesis methods can improve the crystal structure of the synthesized material to varying degrees, there are problems such as too complicated process or incomplete precipitation of lithium salt (waste of raw materials) and by-products in the synthesis process, making it difficult to realize industrialization. Production

Method used

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  • A kind of preparation method of lithium manganate battery material
  • A kind of preparation method of lithium manganate battery material
  • A kind of preparation method of lithium manganate battery material

Examples

Experimental program
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Effect test

Embodiment (1

[0024] Manganese nitrate (2mol / L) and aluminum nitrate (1mol / L) were mixed according to (Mn:Al) molar number 99:1 and placed in a stainless steel reactor, and 4mol / L ammonia solution was added to the solution (the added volume was the original 25% of the solution) was stirred to give a precipitate. Continue to stir and heat the reaction solution to 70°C, and pass air and oxygen mixed gas (1:1) at a rate of 3L / min. When the pH value of the solution reaches about 6-7, stop the ventilation, let it stand, collect and use dilute hydrogen Aqueous lithium oxide solution (0.01 M) washed the precipitate. This precipitate is mixed with an appropriate amount (the amount of lithium hydroxide is 15% in excess of the stoichiometric ratio of the final product lithium manganate) 0.2M lithium hydroxide solution, heated to 200 ° C in a hydrothermal reactor, and reacted for 20 Hours. After the reaction is finished, add 1% (ratio to the amount of lithium manganate) sucrose solution into the rea...

Embodiment (2

[0026] Manganese nitrate (2mol / L) and cerium nitrate (1mol / L) were mixed according to (Mn:Ce) molar number 99:1 and placed in a stainless steel reactor, and 4mol / L ammonia solution was added to the solution (the added volume was the original 25% of the solution) was stirred to give a precipitate. Continue to stir and heat the reaction solution to 70°C, and pass air and oxygen mixed gas (1:1) at a rate of 3L / min. When the pH value of the solution reaches about 6-7, stop the ventilation, let it stand, collect and use dilute hydrogen Aqueous lithium oxide solution (0.01 M) washed the precipitate. This precipitate is mixed with an appropriate amount (the amount of lithium hydroxide is an excess of 25% compared with the stoichiometric ratio of the final product lithium manganate) 0.2M lithium hydroxide solution, heated to 300 ° C in a hydrothermal reactor, and reacted for 30 Hours. After the reaction is finished, add 1% (ratio to the amount of lithium manganate) sucrose solution ...

Embodiment (3

[0028] Manganese nitrate (2mol / L) and aluminum nitrate (1mol / L) were mixed according to (Mn:Al) molar number 99:1 and placed in a stainless steel reactor, and 4mol / L ammonia solution was added to the solution (the added volume was the original 25% of the solution) was stirred to give a precipitate. Continue to stir and heat the reaction solution to 70°C, and pass air and oxygen mixed gas (1:1) at a rate of 3L / min. When the pH value of the solution reaches about 6-7, stop the ventilation, let it stand, collect and use dilute hydrogen Aqueous lithium oxide solution (0.01 M) washed the precipitate. This precipitate is mixed with an appropriate amount (the amount of lithium hydroxide is 15% in excess of the stoichiometric ratio of the final product lithium manganate) 0.2M lithium hydroxide solution, heated to 200 ° C in a hydrothermal reactor, and reacted for 20 Hours. After the completion of the reaction, add 0.8% (ratio to the amount of lithium manganate) of SiO in the reactio...

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Abstract

The invention discloses a method for preparing a lithium manganese oxide battery material, which comprises the following steps of: (1) dissolving a manganese source and a doped ion source into water, then adding an alkaline medium to form ion-doped manganese oxide precipitation, filling oxidizing gas into solution, finishing filling until a pH value of the solution reaches 6 to 7 and separating to obtain ion-doped manganese oxide; (2) mixing the ion-doped manganese oxide and aqueous solution of lithium hydroxide and performing a reaction under the hydrothermal condition of 150 to 500 DEG C to obtain the lithium manganese oxide; (3) pouring a mixture of a carbon source and water, a mixture of oxide and water or precursor salt solution of the oxide which is used for cladding into the obtained reaction solution, sufficiently stirring the obtained mixture, collecting the reaction solution and drying to obtain an intermediate product; and (4) in the protective atmosphere, sintering the intermediate product at a temperature of 500 to 800 DEG C to obtain a finished product. The lithium manganese oxide material prepared by the method has uniform particle size and the high and low temperature cycle performance and the high multiplying power discharge performance of the lithium manganese oxide material are both obviously superior to those of a like product synthetized by a conventional high-temperature solid-phase method.

Description

(1) Technical field [0001] The invention relates to the field of chemical power sources, in particular to a method for preparing a battery material, in particular to a method for preparing a lithium manganate battery material. (2) Background technology [0002] Promoting the industrialization of electric vehicles has become an entry point for the structural adjustment and leap-forward development of China's auto industry. One of the key technologies of electric vehicles is to develop and manufacture power batteries that meet safety and environmental protection requirements, high capacity and long life. Due to its obvious advantages in specific energy, specific power and cycle performance, lithium-ion batteries have become the first choice for power batteries for electric vehicles. The positive electrode material of the battery not only affects the performance of the battery, but also is one of the main factors affecting the price of the power battery. Therefore, the develo...

Claims

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Application Information

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IPC IPC(8): C01G45/12
Inventor 姚金翰王连邦
Owner 姚金翰
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