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Manufacturing method for layered lithium manganate cathode material for lithium ion battery

A layered lithium manganate and lithium-ion battery technology, applied in the direction of manganate/permanganate, etc., can solve the problems of high energy consumption, high temperature and high pressure in reaction conditions, high temperature capacity decay, etc., and achieve good cycle performance and discharge The effect of high capacity

Inactive Publication Date: 2011-11-23
耿世达
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantages of this method are: the reaction conditions are high temperature and high pressure, the reaction process cycle time is longer, and the prepared layered lithium manganate battery has a slightly lower capacity.
The disadvantages of this method are: after two high-temperature calcinations, the process cycle is too long, the energy consumption is large, and the cycle characteristics of the prepared layered lithium manganate battery are poor.
[0008] At present, there are still some difficulties in the application of LiMnO2 in China. One is poor high-temperature thermal stability, the other is poor structural stability, and the third is high-temperature capacity decay. Therefore, there is no mature production technology for layered lithium manganate in China.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] 1) Use electrolytic manganese dioxide as raw material to calcinate at high temperature, control the heating rate to 100°C per hour, control the temperature to 1000°C, keep at this temperature for 10 hours, and then cool to room temperature with the furnace to obtain manganese trioxide .

[0018] 2) Mix manganese trioxide and anhydrous sodium carbonate according to a molar ratio of 1:1, grind the material in a nano grinder, then put it into a vacuum high-temperature sintering furnace, and control the heating rate to 100°C per hour, control the temperature at 1000°C, keep at this temperature for 10 hours, and sinter to obtain NaMnO 2 .

[0019] 3) Weigh the lithium source and NaMnO according to the molar ratio of 6:1 2 , dissolve the lithium source in a certain amount of water, ethylene glycol, ethanol, n-hexanol, prepare the solution, and then add NaMnO 2 , heated at 120°C, cooled to room temperature, filtered the mixture, washed the precipitate with water, ethylene g...

Embodiment 2

[0022] 1) Use electrolytic manganese dioxide as raw material to calcinate at high temperature, control the heating rate to 100°C per hour, control the temperature to 800°C, keep at this temperature for 10 hours, and then cool to room temperature with the furnace to obtain manganese trioxide .

[0023] 2) Mix manganese trioxide and anhydrous sodium carbonate according to a molar ratio of 1:1, grind the material in a nano grinder, then put it into a vacuum high-temperature sintering furnace, and control the heating rate to 100°C per hour, control the temperature at 800°C, keep at this temperature for 20 hours, and sinter to obtain NaMnO 2 .

[0024] 3) Weigh the lithium source and NaMnO according to the molar ratio of 10:1 2 , dissolve the lithium source in a certain amount of water, ethylene glycol, ethanol, n-hexanol, prepare the solution, and then add NaMnO 2 , heated at 160°C, cooled to room temperature, filtered the mixture, washed the precipitate with one of water, ethy...

Embodiment 3

[0028] 1) Use electrolytic manganese dioxide as raw material to calcinate at high temperature, control the heating rate to 100°C per hour, control the temperature to 900°C, keep at this temperature for 20 hours, and then cool to room temperature with the furnace to obtain manganese trioxide .

[0029] 2) Mix manganese trioxide and anhydrous sodium carbonate according to a molar ratio of 1:1, grind the material in a nano grinder, then put it into a vacuum high-temperature sintering furnace, and control the heating rate to 100°C per hour, control the temperature at 900°C, keep at this temperature for 30 hours, and sinter to obtain NaMnO 2 .

[0030] 3) Weigh the lithium source and NaMnO according to the molar ratio of 8:1 2 , dissolve the lithium source in a certain amount of water, ethylene glycol, ethanol, n-hexanol, prepare the solution, and then add NaMnO 2 , heated at 150°C, cooled to room temperature, filtered the mixture, washed the precipitate with one of water, ethyl...

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Abstract

The invention relates to a manufacturing method for a layered lithium manganate cathode material for a lithium ion battery, which adopts electrolytic manganese dioxide as a raw material, and comprises the following steps: performing high-temperature calcination to obtain manganese sesquioxide; mixing the manganese sesquioxide and anhydrous sodium carbonate according to a molar ratio of 1:1, performing sintering to obtain NaMnO2; weighing a lithium source and NaMnO2 according to a molar ratio of 6-10:1, filtering the mixed solution, washing the precipitates, drying to obtain the layered lithium manganate. The layered lithium manganate of a lithium ion battery cathode manufactured by the invention has a charge capacity of above 200 mAh / g, and a discharge capacity of above 180 mAh / g, and has a high first discharge capacity, and good cycle performance.

Description

technical field [0001] The invention relates to a method for manufacturing a layered lithium manganate cathode material for a lithium ion battery. Background technique [0002] Lithium-ion battery is a new type of high-energy secondary battery that began to be put into practical use in the 1990s. It has outstanding advantages such as high voltage, high energy density, good cycle performance, small self-discharge, and no memory effect. It is widely used in notebook computers, mobile phones and other in portable appliances. [0003] The positive electrode material of lithium-ion batteries is mainly lithium cobalt oxide. Due to the lack of cobalt resources, the price is expensive, especially the current cobalt price continues to rise, which has brought huge pressure to lithium-ion battery manufacturers, and lithium cobalt oxide is not available for safety reasons. It is suitable as the positive electrode material of lithium-ion power battery. Lithium manganese oxide is anothe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G45/12
Inventor 耿世达
Owner 耿世达
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