Method for recycling lithium battery positive electrode material LiCoO2 by ternary eutectic solvent system

A technology of deep eutectic solvent and battery positive electrode, which is applied in the field of battery recycling and deep eutectic solvent, can solve the problems of long leaching time and low efficiency, and achieve the effects of improving leaching efficiency, low recycling cost, and shortening leaching time

Active Publication Date: 2022-03-01
SHENYANG LIGONG UNIV
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  • Summary
  • Abstract
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Problems solved by technology

In the binary eutectic system, the Co 3+ reduced to Co 2+ , making it easily soluble in ...

Method used

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  • Method for recycling lithium battery positive electrode material LiCoO2 by ternary eutectic solvent system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] (1) Preparation of deep eutectic solvent: choline chloride, ethylene glycol and benzoic acid were vacuum-dried at 50°C, then mixed at a molar ratio of 1:1.5:0.5, and mixed at 70°C by heating in a water bath Stir for 2 hours at a stirring rate of 200 rpm / min to obtain a clear and transparent solution.

[0038] (2) Leaching of LiCoO 2 : The recovered LiCoO 2 Added to the prepared DES solution, the added LiCoO 2 The mass ratio to DES is 1:50, and the reaction is carried out in an oil bath at 160°C for 1 hour, and the stirring rate is 400 rpm / min.

[0039] (3) Suction filter the solution obtained in the above steps to obtain a filtrate containing cobalt and lithium ions.

[0040] (4) After testing the concentrations of lithium and cobalt ions in the samples obtained in this example, the leaching rates of lithium and cobalt were calculated to be 93.57% and 98.22%, respectively.

Embodiment 2

[0042] (1) Preparation of deep eutectic solvent: choline chloride, ethylene glycol and benzoic acid were vacuum-dried at 50°C, then mixed at a molar ratio of 1:1.8:0.2, and mixed at 70°C by heating in a water bath Stir for 2 hours at a stirring rate of 200 rpm / min to obtain a clear and transparent solution.

[0043] (2) Leaching of LiCoO 2 : The recovered LiCoO 2Added to the prepared DES, the added LiCoO 2 The mass ratio of DES and DES was 1:5, and the reaction was carried out in an oil bath at 160°C for 2h, and the stirring rate was 400rpm / min.

[0044] (3) Suction filter the solution obtained in the above steps to obtain a filtrate containing cobalt and lithium ions.

[0045] (4) After testing the concentrations of lithium and cobalt ions in the samples obtained in this example, the leaching rates of lithium and cobalt were calculated to be 82.88% and 89.41%, respectively.

Embodiment 3

[0047] (1) Preparation of deep eutectic solvent: choline chloride, ethylene glycol and benzoic acid were vacuum-dried at 50°C, then mixed at a molar ratio of 1:1.5:0.5, and mixed at 70°C by heating in a water bath Stir for 2 hours at a stirring rate of 200 rpm / min to obtain a clear and transparent solution.

[0048] (2) Leaching of LiCoO 2 : The recovered LiCoO 2 Added to the prepared DES, the added LiCoO 2 The mass ratio of DES to DES is 1:50, reacted in an oil bath at 160°C for 2h, and the stirring rate was 400rpm / min.

[0049] (3) Suction filter the solution obtained in the above steps to obtain a filtrate containing cobalt and lithium ions.

[0050] (4) After testing the concentrations of lithium and cobalt ions in the samples obtained in this example, the leaching rates of lithium and cobalt were calculated to be 95.89% and 99.99%, respectively.

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Abstract

The invention belongs to the field of battery recovery and eutectic solvents, and relates to a method for recovering a lithium battery positive electrode material LiCoO2 by a ternary eutectic solvent system. According to the invention, choline chloride, ethylene glycol and benzoic acid are mixed according to a molar ratio of 1: (1.9-1.5): (0.1-0.5) to prepare a ternary eutectic solvent system, and the prepared ternary eutectic solvent is low in viscosity, good in fluidity, low in recovery cost and environment-friendly. The ternary eutectic solvent system prepared by the method can efficiently and quickly recover cobalt and lithium in the battery positive electrode material, the leaching time is shortened, and the leaching efficiency of cobalt and lithium is improved.

Description

technical field [0001] The invention belongs to the field of battery recycling and deep eutectic solvents, and relates to a ternary deep eutectic solvent system for recycling lithium battery cathode material LiCoO 2 Methods. [0002] technical background [0003] With the acceleration of economic globalization and the increasing demand for energy, lithium batteries are widely used in various fields due to their advantages such as high energy density, high safety, high working voltage, long cycle life, and environmental friendliness. However, with the end of the service life of a large number of lithium batteries, the recycling and secondary utilization of retired lithium batteries have become the focus of attention. Traditional lithium battery cathode materials are mostly made of LiCoO 2 Composition, which contains valuable metals such as lithium and cobalt, and recycling lithium, cobalt and other valuable metals in lithium batteries can not only avoid the potential threat ...

Claims

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Application Information

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IPC IPC(8): H01M10/54
CPCH01M10/54Y02W30/84
Inventor 李鑫于洪浩李印乔骞孙圆润王炳天
Owner SHENYANG LIGONG UNIV
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