Method for recycling metal elements in waste lithium battery positive electrode material

A technology for waste lithium batteries and positive electrode materials, which is applied in the field of recycling metal elements in the positive electrode materials of waste lithium batteries, and can solve the problems of high cost, waste liquid and waste gas discharge, etc.

Active Publication Date: 2022-04-15
SHANGHAI TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current wet recycling method usually uses a large amount of acid, alkali and reducing agent, so the cost is high, and it brings serious waste liquid and exhaust gas emission problems

Method used

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  • Method for recycling metal elements in waste lithium battery positive electrode material
  • Method for recycling metal elements in waste lithium battery positive electrode material
  • Method for recycling metal elements in waste lithium battery positive electrode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0108]A kind of method for reclaiming metal element cobalt of anode material in the waste lithium battery, carries out according to the following steps:

[0109] Step 1: Routine pretreatment of spent lithium batteries

[0110] 1) Put the used mobile phone lithium battery in saturated salt water for 12 hours to completely release the residual power.

[0111] 2) Take the battery out of the salt water, rinse it with pure water, and dry it, then disassemble the battery to obtain the positive electrode sheet.

[0112] 3) Place the positive electrode sheet in a tube furnace, and perform vacuum cracking at 400° C. to remove the binder. Then, the positive electrode sheet is cooled to room temperature, and the positive electrode material is peeled off from the positive electrode sheet.

[0113] Step 2: Assemble the Electrolytic Cell

[0114] 1) Add about 60ml of 1mol / L NaNO 3 The aqueous electrolyte is added to the H-type electrolytic cell. The volume of the anode electrolysis cha...

Embodiment 2

[0124] A kind of method for reclaiming metal element cobalt of anode material in the waste lithium battery, carries out according to the following steps:

[0125] Step 1: Routine pretreatment of spent lithium batteries

[0126] With embodiment 1. The difference is that the stripped positive electrode material is calcined at 800°C to remove the carbon therein.

[0127] Step 2: Assemble the Electrolytic Cell

[0128] With embodiment 1. The difference is that both the anode and the cathode use platinum wires with a diameter of 1mm.

[0129] Step 3: Electrolysis

[0130] With embodiment 1. The difference is: the experimental temperature is set to 80°C.

[0131] Step 4: Extraction of valuable metal element cobalt

[0132] The precipitate generated in the cathode electrolysis chamber 32 on the cathode side was separated by suction filtration, washed with water, and dried in a drying oven at 100° C. for 2 hours. The obtained powder was pink and had a mass of about 0.05 g. Th...

Embodiment 3

[0134] A kind of method for reclaiming metal element cobalt of anode material in the waste lithium battery, carries out according to the following steps:

[0135] step 1:

[0136] Routine pretreatment of used lithium batteries

[0137] With embodiment 1.

[0138] Step 2:

[0139] With embodiment 1. The difference is: the volume of the anode electrolysis chamber 22 on the anode side of the H-type electrolytic cell is about 50 ml, and the volume of the cathode electrolysis chamber 32 on the cathode side is about 50 ml. The volume of the communicating chamber 4 of the two anode electrolysis chambers 22 is approximately 10 ml. Add about 100ml of 1mol / L NaNO 3 The aqueous electrolyte is added to the H-type electrolytic cell.

[0140] Step 3: Electrolysis

[0141] With embodiment 1.

[0142] Step 4: Extraction of valuable metal element cobalt

[0143] The precipitate generated in the cathode electrolysis chamber 32 on the cathode side was separated by suction filtration, wa...

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Abstract

The invention relates to the technical field of battery recycling, in particular to a method for recycling metal elements in a positive electrode material of a waste lithium battery. The method comprises the following steps: 1) providing a positive electrode material; (2) an electrolysis system is provided, the electrolysis system comprises an anode and a cathode, the anode comprises anolyte, the anolyte is electrolyzed to provide O2 and H < + >, the cathode comprises catholyte, and the catholyte is electrolyzed to provide H2 and OH <->; 3) dissolving the positive electrode material in the step 1) in an anode electrolyte to provide transition metal element ions and Li < + >; and (4) the transition metal element ions provided in the step (2) are diffused into the cathode electrolyte to react with OH <-> so as to provide hydroxide precipitates of the transition metal elements. According to the method, high-value metal elements such as cobalt, nickel and manganese can be recycled from the waste lithium batteries by utilizing the pH gradient generated in the water electrolysis process, and additional use of acid and alkali is avoided.

Description

technical field [0001] The invention relates to the technical field of battery recycling, in particular to a method for recycling metal elements in positive electrode materials of waste lithium batteries. Background technique [0002] Lithium batteries have the advantages of high energy density, high operating voltage, wide operating temperature range and long cycle life. With the development of mobile electronic products such as mobile phones, notebook computers, and new energy vehicles, the production and use of lithium batteries have also grown rapidly. Correspondingly, the number of waste lithium batteries has also increased sharply. In recent years, the recycling of waste lithium batteries has become the focus of the industry. On the one hand, reasonable recycling can avoid soil and water pollution; on the other hand, the cathode materials in waste lithium batteries contain high-value materials, such as lithium cobalt oxide (LiCoO 2 ), manganese cobaltate (LiMn 2 o ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B1/00C25B1/14C25B9/17H01M10/54
CPCY02W30/84
Inventor 管晓飞倪纪弘周佳寅邴瑾泓
Owner SHANGHAI TECH UNIV
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