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Method for preparing spinel lithium manganate serving as cathode material of lithium ion power battery

A technology of spinel lithium manganese oxide and power battery, which is applied in the direction of battery electrodes, circuits, electrical components, etc., can solve the problems of poor cycle stability of lithium manganate materials, and achieve good cycle stability of crystal structure, small oxygen defects, Effect of improving high temperature cycle performance

Inactive Publication Date: 2012-01-04
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, oxygen defects in the crystal structure are also one of the reasons for the poor cycle stability of lithium manganese oxide materials, which must be controlled or eliminated

Method used

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  • Method for preparing spinel lithium manganate serving as cathode material of lithium ion power battery
  • Method for preparing spinel lithium manganate serving as cathode material of lithium ion power battery
  • Method for preparing spinel lithium manganate serving as cathode material of lithium ion power battery

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Experimental program
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Effect test

Embodiment 1

[0019] 10.4 kg of Li 2 CO 3 , with 44 kg of electrolytic MnO 2 and 3 kg Al 2 o 3 Add it into the mixing container and mix evenly, then send it into the high-temperature sintering furnace, firstly heat up to 1050°C for sintering for 4 hours, then slowly cool down to 900°C for sintering for 4 hours, then slowly cool down to 600°C for 6 hours, and at the same time pass into Compressed air, naturally cooled to room temperature after sintering, crushed and classified to obtain spinel lithium manganate material.

[0020] The spinel structure of the synthetic material is RIGAKU, D / MAX-IIIA X-ray diffractometer, CuKα, 40KV tube voltage, 50mA current, and the scanning range of diffraction angle 2θ is 10°~80°. From figure 1 It can be seen that the material synthesized by high-temperature gradient sintering has a spinel cubic structure without impurity phases.

[0021] The surface morphology and particle size of the synthesized materials were observed with JSM-5610SV scanning elect...

Embodiment 2～10

[0027] Synthesize a series of different spinel lithium manganate materials LiMn under different conditions according to the method of the present invention 2-x Me x o 4-z (Me stands for doping metal elements, including Li, Mg, Al, Cr, etc.).

[0028] Table 1 lists the synthesis conditions, chemical composition and electrochemical capacity of a series of different spinel lithium manganate materials prepared according to the present invention.

[0029]

[0030]

Embodiment 11

[0032] 12 kg of LiOH, and 67.6 kg of Mn 3 o 4Add 3.5 kg of MgO into the mixing container and mix evenly, then send it into a high-temperature sintering furnace, first heat up to 1100°C for sintering for 3.5 hours, then slowly cool down to 850°C for 5 hours, then slowly cool down to 700°C for 5 hours At the same time, compressed air is introduced, and after sintering, it is naturally cooled to room temperature to obtain a spinel lithium manganese oxide material for lithium-ion power batteries. Its chemical composition is LiMn 1.825 Mg 0.175 o 4 , the electrochemical discharge capacity is 100mAh / g, and the manganese dissolution is 3.5ppm.

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Abstract

The invention relates to a method for preparing spinel lithium manganate serving as a cathode material of a lithium ion power battery. The method comprises the following steps of: 1) selecting raw materials, namely mixing manganese oxide, a lithium source material and doped metal element oxide; and 2) uniformly mixing the mixture obtained in the step 1), feeding into a continuous sintering furnace, performing high-temperature gradient sintering (namely sintering at the temperature of between 1,000 and 1,200 DEG C for 3 to 5 hours in the first sintering step, sintering at the temperature of between 800 and 900 DEG C for 4 to 6 hours in the second step and sintering at the temperature of between 500 and 700 DEG C for 5 to 8 hours in the third step), introducing compressed air simultaneously, naturally cooling after the sintering is finished, grinding, performing grading treatment, and thus obtaining the cathode material. The invention has the advantages that: the method has a simple process; the crystallinity and the surface state of lithium manganate are controlled through the high-temperature sintering, so that the dissolving rate of manganese is reduced; and then oxygen defects are controlled or overcome through low-temperature sintering.

Description

technical field [0001] The invention relates to a preparation method of spinel lithium manganese oxide, a positive electrode material for lithium-ion power batteries. The lithium manganate material prepared by the method has the characteristics of high crystallinity, low manganese dissolution and small oxygen defects, and is suitable for lithium-ion power batteries Cathode material. Background technique [0002] Lithium-ion batteries are currently widely used in electronic products such as mobile phones, notebook computers and cameras. Its main advantages are high single cell voltage (3.6V), long cycle life, high energy density and no memory effect. In recent years, the application of lithium-ion batteries in power tools, electric bicycles and electric vehicles is also expanding. At present, the main reason hindering the application of lithium-ion batteries in electric vehicles and large-scale energy storage battery systems is the price of batteries. One of the main factor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505
CPCY02E60/122Y02E60/10
Inventor 邓伯华汪勇吴庆余屈德宇肖亮
Owner WUHAN UNIV OF TECH
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