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Method for hydrothermally repairing invalid lithium cobalt oxide material in lithium ion battery by ultrasonic field enhancement

A technology for lithium ion batteries and lithium cobalt oxide, which is applied in the field of hydrothermal repair of lithium cobalt oxide materials, can solve the problems of strong corrosion of reaction equipment, long reaction time, environmental pollution, etc., and achieves improvement of electrochemical conditions and electrochemical performance. The effect of improving, considerable economic benefits

Inactive Publication Date: 2013-05-01
TONGJI UNIV
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AI Technical Summary

Problems solved by technology

The process of calcining lithium cobalt oxide at high temperature will produce harmful gas, cause environmental pollution, and consume a lot of energy. However, the hydrothermal treatment method requires high temperature, long reaction time, and strong corrosion to the reaction equipment. Therefore, it is necessary to find a better Repair technology to deal with failed lithium cobalt oxide materials

Method used

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  • Method for hydrothermally repairing invalid lithium cobalt oxide material in lithium ion battery by ultrasonic field enhancement

Examples

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Effect test

Embodiment 1

[0020] (1) Select the discarded lithium-ion battery, discharge it and disassemble it to obtain the positive electrode aluminum foil;

[0021] (2) Put the positive electrode aluminum foil into a muffle furnace and calcinate at 450°C for 2 hours. After the temperature drops, shake the burned aluminum foil to make lithium cobalt oxide fall off from the current collector aluminum foil to obtain black lithium cobalt oxide powder

[0022] (3) Pour the mixed solution of lithium cobalt oxide waste and lithium hydroxide solution into an ultrasonic reactor, the volume of the mixed solution is 0.7L, and the reactor is equipped with an electric heating device, a stirring device, a temperature control device, and a water flow cooling device, and Install an ultrasonic horn at the bottom of the reactor;

[0023] (4) The power of the ultrasonic equipment is 999W, the ultrasonic frequency is 25 kHz, heated in a closed ultrasonic reactor at a constant temperature of 150°C, and ultrasonic radiat...

Embodiment 2

[0028] (1) Select the discarded lithium-ion battery, discharge it and disassemble it to obtain the positive electrode aluminum foil;

[0029] (2) Put the positive electrode aluminum foil into a muffle furnace and calcinate at 400°C for 2 hours. After the temperature drops, shake the burned aluminum foil to make lithium cobalt oxide fall off from the current collector aluminum foil to obtain black lithium cobalt oxide powder

[0030] (3) Pour the mixed solution of lithium cobalt oxide waste and lithium hydroxide solution into an ultrasonic reactor, the volume of the mixed solution is 0.7L, and the reactor is equipped with an electric heating device, a stirring device, a temperature control device, and a water flow cooling device, and Install an ultrasonic horn at the bottom of the reactor;

[0031] (4) The power of the ultrasonic equipment is 800W, the ultrasonic frequency is 25 kHz, heated in a closed autoclave at a constant temperature of 150°C, and ultrasonic radiation is ap...

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Abstract

The invention relates to a method for hydrothermally repairing an invalid lithium cobalt oxide material in a lithium ion battery by ultrasonic field enhancement. The method comprises the concrete steps as follows: disassembling the lithium ion battery to obtain an anode aluminum foil; calcining for 2-3 h at the temperature of 400-450 DEG C, and vibrating to enable lithium cobalt oxide to drop from a current collector foil so as to obtain lithium cobalt oxide powder; immersing the lithium cobalt oxide powder into a lithium hydroxide solution, mixing, pouring a mixed solution into an ultrasonic reaction kettle, heating to 150-180 DEG C, applying ultrasonic waves, and radiating for 6-12 h; and cooling the ultrasonic reaction kettle, taking out the mixed solution from the ultrasonic reaction kettle, washing, filtering and drying to obtain the repaired lithium cobalt oxide material. According to the method, lithium cobalt oxide can more easily drop from the current collector foil, organic matters attached on the surface of lithium cobalt oxide can be effectively removed, the content of lithium ions in the invalid lithium cobalt oxide material is remarkably increased, the electrochemical performance of lithium cobalt oxide is remarkably improved, and the repaired lithium cobalt oxide material can again serve as an anode material for producing the lithium ion battery. In addition, the lithium cobalt oxide material in the waste lithium ion battery can be effectively treated, so that considerable economic benefits are obtained while the environmental pollution is reduced.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and in particular relates to a method for hydrothermal restoration of lithium cobalt oxide materials in a failed lithium ion battery enhanced by an ultrasonic field. Background technique [0002] Lithium batteries have been widely used due to their excellent performance, and a large number of waste lithium batteries have also been produced. Reasonable and effective resource disposal of waste lithium batteries, especially the recycling and reuse of positive electrode material lithium cobaltate, can not only alleviate the potential environmental pollution pressure, but also solve the problem of cobalt resource shortage, which is of great significance. Lithium batteries, as electronic consumables, are invalid and scrapped after a certain number of years of use. Studies have shown that the positive and negative electrode materials and electrolytes of lithium-ion batteries have a cer...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G51/00H01M10/54
CPCY02E60/12Y02W30/84
Inventor 贺文智张哲鸣夏静李光明黄菊文
Owner TONGJI UNIV
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