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Preparation method for lithium manganate as anode material of lithium ion battery

A technology for lithium ion batteries and cathode materials, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of limiting industrial scale, affecting the chemical activity of lithium manganate, poor high temperature cycle performance and electrochemical stability, etc. Low production cost, easy industrial scale production, high temperature resistance and improved cycle performance

Inactive Publication Date: 2015-07-01
崔黔成
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, its poor high temperature cycle performance and electrochemical stability greatly limit its industrial scale.
Analyzing the various elements of its production process, the lithium manganese oxide currently used in industrialization basically uses electrolytic MnO 2 , its chemical activity is relatively stable, which affects the electrochemical activity of lithium manganate to a certain extent.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0009] With a certain amount of chemically pure MnC0 3 and battery-grade Li 2 C0 3 Mixed rare earths with 2% of the total mass of the first two substances as raw materials, the mass ratio of the three is 115:25:2.8, put it in a ball mill, and pulverize it until it passes through a 250 mesh sieve, and then put the pulverized product into an electric furnace In the process, the temperature was raised to 600°C at 2°C / min, and kept at this temperature for 7 hours, and then the temperature was raised to 800°C-850°C at a rate of 4°C / min, kept at this temperature for 15 hours, and naturally cooled to room temperature. Synthetic lithium-ion battery cathode material powder LiMn 2 o 4 .

Embodiment 2

[0011] With a certain amount of chemically pure MnC0 3 and battery-grade Li 2 C0 3 2% of the total mass of the first two substances and mixed rare earth as raw materials, the mass ratio of the three is 230:50:5.6, placed in a ball mill, ball milled to pass through a 200 mesh sieve, and then the ball milled resultant is put into an electric furnace, Raise the temperature to 600°C at 3°C / min, keep it at this temperature for 7 hours, then raise the temperature to 800°C-850°C at a rate of 4°C / min, keep it at this temperature for 15 hours, and cool naturally to room temperature to obtain the synthesized Lithium-ion battery cathode material powder LiMn 2 o 4 .

Embodiment 3

[0013] With a certain amount of chemically pure MnC0 3 and battery-grade Li 2 C0 3 Mixed rare earths with 2% of the total mass of the first two substances as raw materials, the mass ratio of the three is 460:100:11.2, placed in a ball mill, ball milled to pass through a 300 mesh sieve, and then the ball milled resultant is put into an electric furnace, Raise the temperature at 4°C / min to 600°C, keep it at this temperature for 7 hours, then raise the temperature to 800°C-850°C at a rate of 4°C / min, keep it at this temperature for 15 hours, and cool naturally to room temperature to obtain the synthesized Lithium-ion battery cathode material powder LiMn 2 o 4 .

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PUM

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Abstract

The invention discloses a preparation method for lithium manganate as an anode material of a lithium ion battery. The preparation method comprises the following steps of mixing chemically pure MnCO3 and battery-grade Li2CO3 according to the mass ratio of 4.6:1, and adding mixed rare earth which is 2 percent of the total mass number of the chemically pure MnCO3 and the battery-grade Li2CO3; feeding the mixture in a ball grinding mill for mixing and crushing; after materials pass through a sieve with 200 to 300 meshes, placing the materials into an electric furnace, rising the temperature of the electric furnace to be 600DEG C at the speed of 2 to 4DEG C per minute; keeping the temperature of 600DEG C for 6 hours and then rising the temperature to be 800 to 850DEG C and keeping the temperature of 800 to 850DEG C for 18 hours; naturally and slowly cooling to obtain lithium manganate powder as the anode material of the lithium ion battery. The preparation method has the advantages of good high temperature resistance, simple process, short flow and production cost reduction; the cycle performance and specific capacity meet the requirement that the lithium manganate is produced on an industrial scale.

Description

technical field [0001] The invention relates to an active material of a secondary battery electrode, in particular to a preparation method of lithium manganate which is a positive electrode material of a lithium ion battery. Background technique [0002] Existing lithium ion battery cathode material lithium manganese oxide is due to the defect of high temperature resistance and cycle performance and specific capacity is low (only 110mAh / g), thus has restricted the industrialized application of the lithium ion battery that is cathode material with lithium manganate. Lithium manganese oxide has good synthetic performance and stable structure, and can significantly improve its cycle performance. Mainly through doping is an effective method to improve its performance. Lithium manganese oxide, a positive electrode material doped with metal ions with strong M-O bonds, strong octahedral stability, and an ionic radius similar to that of manganese ions, is one of the solutions for...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/1391H01M4/505
CPCH01M4/1391H01M4/505Y02E60/10
Inventor 崔黔成
Owner 崔黔成