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Recovering method of waste lithium manganite positive electrode

A recovery method, technology of old lithium manganate, applied in the field of recovery of waste lithium manganate positive electrode

Active 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 manganate in the prior art

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] (1) will contain 0.002mol LiMn 2 o 4 The lithium manganate 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 0.0085mol 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 t...

Embodiment 2

[0064] (1) will contain 0.004mol LiMn 2 o 4 The lithium manganate 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 0.017mol 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 th...

Embodiment 3

[0069] (1) will contain 0.006mol LiMn 2 o 4 The lithium manganate 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 0.0255mol 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 t...

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PUM

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Abstract

The invention belongs to the technical field of the lithium ion battery positive electrode recovery, and provides a recovering method of a waste lithium manganite positive electrode. The method comprises the following steps: (1) after mixing the lithium manganite positive electrode, acidic solution of hydrogen peroxide, a phosphate radical source, an iron source, lithium nitrate and citric acid, drying, to obtain a first precursor, wherein a mole ratio of lithium, iron and manganese elements in the first precursor is 1.05-1.15:x:(1-x), wherein x is greater than 0 and less than 1; (2) successively performing ball-milling and first calcining on the first precursor, to obtain a second precursor; and (3) after mixing the second precursor and the citric acid, performing second calcining, to obtain a lithium iron manganese phosphate positive electrode material, wherein the first calcining and the second calcining are performed in an inert gas or nitrogen atmosphere. A discharge specific volume of the positive electrode material obtained by the provided method 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 manganate 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 manganate (LiMn 2 o 4 ) 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): C01B25/45H01M10/54
CPCY02W30/84
Inventor 吴兴隆杨洋
Owner NORTHEAST NORMAL UNIVERSITY
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