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Method for recycling waste lithium cobaltate positive electrode

A recovery method, lithium cobalt oxide technology, which is applied in the field of recovery of waste lithium cobalt oxide positive electrode, can solve problems such as not being able to effectively recover lithium cobalt oxide

Inactive Publication Date: 2019-05-10
NORTHEAST NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is no method for effectively recovering lithium cobalt oxide in the prior art

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] (1) will contain 0.004mol LiCoO 2 The lithium cobaltate positive electrode is mixed with the acidic solution of hydrogen peroxide with a pH value of 3, and the molar weight of the hydrogen peroxide is 0.006mol to obtain a mixed solution; the mixed solution is mixed with 0.0065mol LiNO 3 , 0.006mol Fe(NO 3 ) 3 , 0.01mol NH 4 h 2 PO 4 , 0.01mol C 6 h 8 o 7 After mixing, heat up to 80°C and stir at 80°C until dry to obtain the first precursor;

[0056] (2) ball mill the first precursor at 500r / min for 12h, then dry the product obtained by ball milling, and then calcinate it in an argon atmosphere at 350°C for 3h to obtain the second precursor; during the ball milling process, The mass ratio of the ball to the first precursor is 20:1, and the dispersant used for ball milling is acetone;

[0057] (3) Mix the second precursor and citric acid according to the mass ratio of 2:1, ball mill at 500r / min for 12h, and then dry the product obtained by ball milling, and then ...

Embodiment 2

[0064] (1) will contain 0.008mol LiCoO 2 The lithium cobaltate positive electrode is mixed with the acidic solution of hydrogen peroxide with a pH value of 3, and the molar weight of the hydrogen peroxide is 0.012mol to obtain a mixed solution; the mixed solution is mixed with 0.013mol LiNO 3 , 0.012mol Fe(NO 3 ) 3 , 0.02mol NH 4 h 2 PO 4 , 0.02mol C 6 h 8 o 7 After mixing, heat up to 80°C and stir at 80°C until dry to obtain the first precursor;

[0065] (2) ball mill the first precursor at 500r / min for 12h, then dry the product obtained by ball milling, and then calcinate it in an argon atmosphere at 350°C for 3h to obtain the second precursor; during the ball milling process, The mass ratio of the ball to the first precursor is 20:1, and the dispersant used for ball milling is acetone;

[0066] (3) Mix the second precursor and citric acid according to the mass ratio of 2:1, ball mill at 500r / min for 12h, and then dry the product obtained by ball milling, and then c...

Embodiment 3

[0069] (1) will contain 0.012mol LiCoO 2 The lithium cobaltate positive electrode is mixed with the acidic solution of hydrogen peroxide with a pH value of 3, and the molar weight of the hydrogen peroxide is 0.018mol to obtain a mixed solution; the mixed solution is mixed with 0.0195mol LiNO 3 , 0.018mol Fe(NO 3 ) 3 , 0.03mol NH 4 h 2 PO 4 , 0.03mol C 6 h 8 o 7 After mixing, heat up to 80°C and stir at 80°C until dry to obtain the first precursor;

[0070] (2) ball mill the first precursor at 500r / min for 12h, then dry the product obtained by ball milling, and then calcinate it in an argon atmosphere at 350°C for 3h to obtain the second precursor; during the ball milling process, The mass ratio of the ball to the first precursor is 20:1, and the dispersant used for ball milling is acetone;

[0071] (3) Mix the second precursor and citric acid according to the mass ratio of 2:1, ball mill at 500r / min for 12h, and then dry the product obtained by ball milling, and then ...

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Abstract

The invention belongs to the technical field of positive electrode recycling of lithium ion batteries. The invention provides a method for recycling a waste lithium cobaltate positive electrode, and the method comprises the following steps: step (1), mixing the lithium cobaltate positive electrode, an acidic solution of hydrogen peroxide, a phosphate source, an iron source, lithium nitrate and citric acid, and drying to obtain a first precursor, wherein the molar ratio of lithium, iron and cobalt elements in the first precursor is 1.05 to 1.15: x: (1-x), and x is greater than 0 but less than 1; step (2), sequentially carrying out ball milling and first calcination on the first precursor to obtain a second precursor; and step (3), mixing the second precursor with the citric acid, and carrying out second calcination to obtain an iron cobalt lithium phosphate positive electrode material, wherein the first calcination and the second calcination are carried out in an inert gas or a nitrogenatmosphere. The discharge specific capacity of the positive electrode material obtained by the method provided by the invention can reach 135 mAh / g or more.

Description

technical field [0001] The invention relates to the technical field of lithium ion battery positive electrode recycling, in particular to a method for recycling waste lithium cobaltate positive electrodes. Background technique [0002] With the extensive use of lithium-ion batteries, a large number of waste lithium-ion batteries have been generated. These waste batteries are eliminated because they cannot meet the corresponding energy storage needs. If these waste batteries are directly treated like other garbage, it is likely to cause serious environmental pollution, and there is also a potential fire hazard caused by battery short circuit. Moreover, these waste batteries contain a large amount of transition metals, and these transition metals have limited reserves in the earth, so they are directly treated as general garbage, and a large amount of transition metals will be wasted. [0003] Lithium cobalt oxide (LiCoO 2 ) is a widely used cathode material for commercial ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/58H01M4/62H01M10/0525H01M10/54
CPCY02E60/10Y02W30/84
Inventor 吴兴隆杨洋
Owner NORTHEAST NORMAL UNIVERSITY
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