Method for preparing lithium manganate cathode material by microwave sintering

A cathode material and microwave heat treatment technology, applied in the direction of manganate/permanganate, etc., can solve the problems of high cost and poor performance, and achieve low production cost, reduced synthesis time, and good reproducibility

Inactive Publication Date: 2010-12-15
HENAN UNION NEW ENERGY
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  • Abstract
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Problems solved by technology

[0007] The technical problem to be solved in the present invention is: to overcome the lithium ion battery cathode material LiMn in the prior art 2 o 4 The shortcomings of high cost and poor performance provide a LiMn battery cathode material with simplified process, low cost and low energy consumption. 2 o 4 The preparation method is suitable for industrial production, and the prepared positive electrode material has high charge and discharge capacity and good cycle performance

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  • Method for preparing lithium manganate cathode material by microwave sintering
  • Method for preparing lithium manganate cathode material by microwave sintering
  • Method for preparing lithium manganate cathode material by microwave sintering

Examples

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Embodiment 1

[0044] Embodiment one: LiMn cathode material for lithium-ion batteries 2 o 4 preparation method

[0045] (1) 3600 g of LiOH·H 2 O, 13912 g MnO 2 Put it into the mixer and mix evenly;

[0046] (2) Add 3000 ml of pure water, stir and mix thoroughly to obtain a paste precursor;

[0047] (where LiOH·H 2 O molecular weight 42, MnO 2 The molecular weight is 87, that is, the molar ratio of Li:Mn is 1:1.87)

[0048] (3) Put the paste precursor into a silicon carbide crucible, put the silicon carbide crucible into an industrial microwave oven with a power of 15KW, raise the temperature to 650°C at a rate of 4°C per minute, and keep it for 30 minutes to obtain the positive electrode material LiMn 2 o 4 .

[0049] This example can prepare about 14.5kg LiMn 2 o 4 , the amount of pure water added is equivalent to LiMn 2 o 4 21% of the volume.

Embodiment 2

[0050] Embodiment two: LiMn cathode material for lithium-ion batteries 2 o 4 preparation method

[0051] (1) 3000 grams of lithium carbonate, 13912 grams of MnO 2 Put it into the mixer and mix well;

[0052] (Li 2 CO 3 Molecular weight 73.80, MnO 2 The molecular weight is 87, in this case the molar ratio of Li:Mn is 1:1.97)

[0053] (2) Add 4000 ml of pure water, stir and mix well to obtain a paste precursor;

[0054] (3) Put the paste precursor into a kraft paper crucible, put the kraft paper crucible into an industrial microwave oven, the power of the industrial microwave oven is 20KW, heat up to 700°C at a rate of 6°C per minute, and keep it for 40min to obtain LiMn 2 o 4 .

[0055] This example can prepare about 14.5kg LiMn 2 o 4 , where the amount of pure water added is equivalent to LiMn 2 o 4 28% of the volume.

Embodiment 3

[0056] Embodiment three: It is basically the same as Embodiment 1, the difference is that:

[0057] A graphite crucible was used instead of a silicon carbide crucible, and the microwave heat treatment temperature was 680°C, and the temperature was kept for 50 minutes.

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Abstract

The invention relates to a method for preparing LiMn2O4 lithium ion battery cathode material, belonging to the lithium ion battery material field. The method includes the following steps: lithium source compound and manganese source compound are respectively weighed by the proportion of 1:1.7-2.0, the lithium source compound and manganese source compound are added into a blender mixer and homogeneous mixing is carried out, then a given amount of purified water is added and stirring is carried out, thus obtaining paste precursor, the paste precursor is placed into an industrial microwave oven, heat treatment is carried out for 20-55min under the conditions that heating rate is 2-10 DEG C / min and temperature is 600-750 DEG C, and then cooling to room temperature is carried out. The method also can prepare carbon coated metal doped LiMn2O4 lithium ion battery cathode material. The invention has available raw materials, preparation process is simple and is easy to control, energy consumption is low, cost is low, product purity is high, quality is stable, electrochemical properties are good, and the method can be widely applied to industrialized production.

Description

technical field [0001] The invention relates to a preparation method of a positive electrode active material of a lithium ion battery, in particular to a preparation method of lithium manganese oxide, a positive electrode material of a lithium ion battery. Background technique [0002] Due to its high output voltage, high specific energy, long cycle life, small self-discharge, safety, and no memory effect, lithium-ion batteries have become the focus of the development of new energy materials in countries around the world. The positive electrode material is lithium-ion The key to the battery. At present, the main cathode materials are: cobalt acid burial, nickel acid burial, manganese acid burial, etc., but only cobalt acid burying has formed large-scale production in China. Since cobalt is a precious metal, its resources are limited and toxic, its development is restricted, and there are potential safety hazards in cobalt acid burial, so people are trying to find a substitu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G45/12
Inventor 刘新保贾晓林李恩惠蔡俊明周永刚吴铁雷
Owner HENAN UNION NEW ENERGY
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