Method for recycling cobalt and lithium in cathode material of waste lithium cobalt oxide battery by using deep eutectic solvent

A low eutectic solvent, battery cathode technology, applied in the direction of improving process efficiency, can solve problems such as easy generation of toxic gas, secondary pollution, unfavorable environmental protection, etc., and achieve the effects of being beneficial to environmental protection, less dangerous, and easy to obtain

Inactive Publication Date: 2020-04-28
WUHAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Among them, pyrometallurgy refers to the use of high temperature to remove the organic binder in the battery powder, separate the metal from impurities, and then use a series of methods such as pyrolysis and screening to recover valuable metals, but its disadvantages are that the energy consumption is too high, and It is easy to produce toxic gas, which is not conducive to environmental protection; hydrometallurgy refers to the use of chemical reagents to selectively leach metal elements in battery powder, and the separation and purification of metals through extraction, salting out, etc., but currently hydrometallurgy mainly uses strong acids such as Hydrochloric acid, nitric acid, etc. are used as leaching agents, which are dangerous and easy to cause secondary pollution

Method used

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  • Method for recycling cobalt and lithium in cathode material of waste lithium cobalt oxide battery by using deep eutectic solvent
  • Method for recycling cobalt and lithium in cathode material of waste lithium cobalt oxide battery by using deep eutectic solvent

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Effect test

Embodiment 1

[0027] (1) Choline chloride and oxalic acid dihydrate are mixed in a 1:1 molar ratio to form a deep eutectic solvent;

[0028] (2) Mix 5 mL of the deep eutectic solvent obtained in step (1) with 0.1 g of waste lithium cobalt oxide battery positive electrode material powder, and heat and leach at 90°C for 1 hour, and obtain insoluble impurities and leachate after solid-liquid separation;

[0029] (3) adding deionized water to the leachate obtained in step (2) to obtain a cobalt oxalate precipitate, separating the precipitate and the leachate, drying the precipitate to obtain a cobalt oxalate solid, and the recovery rate of the cobalt element reaching 93%;

[0030] (4) Heating and concentrating the leaching solution to remove deionized water, adding ethanol to obtain lithium oxalate precipitation, separating the precipitation and leaching solution, drying the precipitation to obtain lithium oxalate solid, and the recovery rate of lithium element reaches 85%.

Embodiment 2

[0032] (1) Choline chloride and oxalic acid dihydrate are mixed in a 1:1 molar ratio to form a deep eutectic solvent;

[0033] (2) Mix 5mL of the deep eutectic solvent obtained in step (1) with 0.2g of waste lithium cobaltate battery positive electrode material powder, and heat and leach at 90°C for 80min, and obtain insoluble impurities and leachate after solid-liquid separation;

[0034] (3) adding deionized water to the leachate obtained in step (2) to obtain a cobalt oxalate precipitate, separating the precipitate and the leachate, drying the precipitate to obtain a cobalt oxalate solid, and the recovery rate of the cobalt element reaching 90%;

[0035] (4) Heating and concentrating the leaching solution to remove deionized water, adding ethanol to obtain lithium oxalate precipitation, separating the precipitation and leaching solution, drying the precipitation to obtain lithium oxalate solid, and the recovery rate of lithium element reaches 83%.

Embodiment 3

[0037] (1) Choline chloride and oxalic acid dihydrate are mixed in a 2:1 molar ratio to form a deep eutectic solvent;

[0038] (2) Mix 5 mL of the deep eutectic solvent obtained in step (1) with 0.1 g of waste lithium cobaltate cathode material powder, and leaching at 90°C for 80 min, and obtain insoluble impurities and leachate after solid-liquid separation;

[0039] (3) adding deionized water to the leachate obtained in step (2) to obtain a cobalt oxalate precipitate, separating the precipitate and the leachate, drying the precipitate to obtain a cobalt oxalate solid, and the recovery rate of the cobalt element reaching 88%;

[0040] (4) Heating and concentrating the leaching solution to remove deionized water, adding ethanol to obtain lithium oxalate precipitation, separating the precipitation and leaching solution, drying the precipitation to obtain lithium oxalate solid, and the recovery rate of lithium element reaches 82%.

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Abstract

The invention discloses a method for recycling cobalt and lithium in a cathode material of a waste lithium cobalt oxide battery by using a deep eutectic solvent. The method includes the following steps that (1) choline chloride is mixed with oxalic acid dihydrate to form the deep eutectic solvent; (2) the deep eutectic solvent obtained in the step (1) is mixed with cathode material powder of the waste lithium cobalt oxide battery, the mixture is heated and leached, and insoluble impurities are separated from a leachate; (3) deionized water is added into the leachate obtained in the step (2) toobtain a cobalt oxalate precipitate, and the precipitate is separated from the leachate; and (4) the leachate is heated and concentrated to remove the deionized water, ethanol is added to obtain a lithium oxalate precipitate, and the precipitate is separated from the leachate. According to the method, the leachate can be recycled, used raw materials are safe, cheap, and low in pollution, the process flow is short, operation is easy, energy consumption is low, and the purity of recycled products is high.

Description

technical field [0001] The invention discloses a method for recovering cobalt and lithium in the positive electrode material of the waste lithium cobaltate battery by using a deep eutectic solvent, which can efficiently and environmentally friendly recover the metal elements in the positive electrode material of the waste lithium cobaltate battery, and belongs to the recovery of electronic waste The field of processing and resource utilization technologies. Background technique [0002] Since lithium cobalt oxide has been used as the positive electrode material of lithium-ion rechargeable batteries, lithium-ion batteries have been widely used in various fields due to their excellent properties such as high energy density, weak memory effect and low self-discharge. In recent years, with the rapid development of new energy vehicles, the demand for lithium-ion batteries has increased significantly. On the one hand, this has led to a continuous increase in the prices of metals ...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B23/00C22B26/12
CPCC22B7/006C22B23/0407C22B23/0461C22B26/12Y02P10/20
Inventor 彭天右刘鑫
Owner WUHAN UNIV
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