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Method for preparing lithium manganate used as lithium ion battery anode material by using trimanganese tetroxide

A lithium ion battery, manganese tetroxide technology, applied in battery electrodes, manganate/permanganate, circuits, etc., can solve the problems of application limitation, low tap density, and high tap density, and achieve process steps Simple and practical, the product composition is uniform, and the effect of improving the tap density

Active Publication Date: 2012-02-01
CHANGSHA RES INST OF MINING & METALLURGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Manganese tetraoxide has a high purity (Mn3O4 content ≥ 99%), which is an ideal raw material for the synthesis of high-quality lithium manganate, but due to the current market The tap density of lithium manganese oxide directly synthesized from the sold manganese tetraoxide is low (generally less than 1.8g / cm3), and the volume energy of the power battery made of this lithium manganese oxide is obviously low , the application is very limited
At present, it has also been reported that the tap density obtained by synthesizing lithium manganate after wet method of manganese tetraoxide is higher (greater than 2.0 g / cm 3 ), but the process of preparing trimanganese tetroxide by this method is complicated, difficult to control, and not suitable for large-scale industrial production

Method used

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Embodiment 1

[0018] A kind of method of the present invention prepares lithium ion battery anode material lithium manganese oxide with trimanganese tetraoxide, comprises the following steps:

[0019] Trimanganese tetraoxide (Mn 3 o 4 , content ≥ 99%) and lithium carbonate are prepared according to the lithium-manganese molar ratio of 0.52, and then placed in a mixer and mixed evenly; then pre-sintered in a muffle furnace, during the pre-sintering process, the temperature rise rate is 3 ° C / min Raise the temperature to 820°C, then carry out pre-sintering and heat preservation for 15 hours, and then cool naturally with the furnace (the cooling rate is controlled at 1°C / min to 10°C / min); then use a stirring ball mill to perform ball milling on the pre-sintered material with a ball-to-material ratio of 4 : 1, the ball milling frequency is controlled to be 30Hz, and the ball milling time is 2 hours; spray drying is carried out after ball milling, and the speed of rotation during spray drying...

Embodiment 2

[0022] A kind of method of the present invention prepares lithium ion battery anode material lithium manganese oxide with trimanganese tetraoxide, comprises the following steps:

[0023] Trimanganese tetraoxide (Mn 3 o 4 , content ≥ 99%) and lithium carbonate are prepared according to the lithium-manganese molar ratio of 0.54 and then placed in a mixer and mixed evenly; then pre-sintered in a muffle furnace. Raise the temperature to 800°C, then carry out pre-sintering and heat preservation for 15 hours, and then cool naturally with the furnace (the cooling rate is controlled at 1°C / min to 10°C / min); then use a stirring ball mill to perform ball milling on the pre-sintered material with a ball-to-material ratio of 4 : 1, the ball milling frequency is controlled to be 30Hz, and the ball milling time is 2 hours; spray drying is carried out after ball milling, and the speed of rotation during spray drying is controlled at an air supply pressure of 3.0MPa, the heating temperature ...

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Abstract

The invention discloses a method for preparing lithium manganate used as a lithium ion battery anode material by using trimanganese tetroxide, comprising the following steps of: firstly, preparing the trimanganese tetroxide and the lithium salt according to the molar ratio of lithium to manganese 0.5-0.6, uniformly mixing the trimanganese tetroxide and the lithium salt to get the precursor, and then, pre-sintering the precursor; executing ball milling and spray drying after pre-sintering, and then, executing secondary sintering; finally, executing isostatic cool pressing on the products of the secondary sintering process, and crashing and classifying the products to get the lithium manganate used as the lithium ion battery anode material. The method has the advantages of being simple and practical in technical steps, low in cost, easy to realize mass industrial production, excellent in product performance, and the like.

Description

technical field [0001] The invention relates to a preparation process of a positive electrode material of a battery, in particular to a preparation method of lithium manganese oxide, a positive electrode material of a lithium ion battery. Background technique [0002] At present, lithium manganese oxide, the cathode material of lithium-ion batteries, is mainly composed of electrolytic manganese dioxide (MnO 2 content ≥ 92%), but its electrical properties (mainly cycle performance) are not ideal. Among them, the impurities contained in electrolytic manganese dioxide itself (such as sulfate ion, etc.) affect the improvement of the electrochemical performance of lithium manganate to a certain extent. The purity of manganese tetraoxide is higher (Mn 3 o 4 content ≥ 99%), it is an ideal raw material for the synthesis of high-quality lithium manganate, but at present, the tap density of lithium manganate directly synthesized by manganese tetraoxide sold in the market is relativ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G45/12H01M4/1391
CPCY02E60/122Y02E60/10
Inventor 习小明苗建国湛中魁王双才胡常波黄义宏段兴无揭超
Owner CHANGSHA RES INST OF MINING & METALLURGY
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