Method for recovering lithium and transition elements in waste lithium battery positive material by liquid phase method

A technology for waste lithium batteries and cathode materials, which is applied in the field of liquid-phase method for recovering lithium and transition elements in cathode materials of waste lithium batteries, can solve the problems of excessive energy consumption, high use temperature, harsh production environment, etc., and achieves environmentally friendly energy. consumption effect

Inactive Publication Date: 2019-10-15
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, the extraction of metal raw materials through pyrometallurgy technology has the problems of high temperature (greater than 700K), excessive energy consumption and low product purity.
Wet extraction separation needs to process materials with hydrochloric acid, sulfuric acid and nitric acid, etc., there is a lot of pollution and the production environment is relatively harsh

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] This embodiment includes the following steps:

[0027] (1) Make the positive electrode LiCoO 2 The waste lithium battery (the active material in the positive electrode (LiCoO 2 ): Binder (PVDF): Conductive carbon black (C) mass ratio = 92:4:4) for discharge treatment, disassembled in the glove box, and dried in a vacuum oven to obtain dry electrolyte Positive plate;

[0028] (2) Place the positive electrode sheet containing 10 g of active material in 100 mL of deep eutectic solvent (the molar ratio of choline chloride to urea is 1:5, and the solution contains 0.2 mol of choline chloride), 200 Stir the active material in the positive electrode sheet at ℃ until the active material in the electrode sheet is completely dissolved to obtain a reaction solution;

[0029] (3) After the reaction solution obtained in step (2) turns dark blue without any change, it is filtered, washed, and the obtained filter cake is dried to obtain a current collector, a binder and a conductiv...

Embodiment 2

[0034] This embodiment includes the following steps:

[0035] (1) Make the cathode LiMn 2 o 4 Discharge treatment of waste lithium batteries (active material in the positive electrode (LiMn 2 o 4 ): Binder (PVDF): Conductive carbon black (C) mass ratio = 94:3:3), disassembled in the glove box and placed in a vacuum oven for drying to obtain a dry positive electrode sheet from which the electrolyte was removed;

[0036] (2) Place the positive electrode sheet containing 15 g of active material in 300 mL (the molar ratio of choline chloride: urea is 1:5, and the solution contains 0.4 mol of choline chloride), and the positive electrode is placed at 350 °C. Stir the active substance in the tablet, dissolve completely, and obtain the reaction solution;

[0037] (3) After the reaction solution obtained in step (2) turns dark blue without any change, it is filtered, washed, and the obtained filter cake is dried to obtain a current collector, a binder and a conductive agent; addin...

Embodiment 3

[0041] This embodiment includes the following steps:

[0042] (1) Make the positive electrode LiCoO 2 Discharge treatment of waste lithium batteries (active material in the positive electrode (LiCoO 2 ): Binder (PVDF): Conductive carbon black (C) mass ratio = 92:4:4), disassembled in the glove box and placed in a vacuum oven for drying treatment to obtain a dry positive electrode sheet from which the electrolyte was removed;

[0043] (2) Place the positive electrode sheet containing 10 g of active material in 100 mL (the molar ratio of tetrabutylammonium hydrogen sulfate: ethylene glycol is 10:1, and the solution contains 0.2 mol of tetrabutylammonium hydrogen sulfate), 250 Stir the active material in the positive electrode sheet at ℃, dissolve completely, and obtain the reaction solution;

[0044] (3) After the reaction solution obtained in step (2) turns dark blue without any change, it is filtered, washed, and the obtained filter cake is dried to obtain a current collecto...

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Abstract

The invention discloses a method for recovering lithium and transition elements in waste lithium battery positive material by a liquid phase method. The method comprises the following steps that (1) the waste lithium battery is subjected to discharging treatment, the disassembled waste lithium battery is placed in a negative pressure environment for drying, and a dried positive plate for removingelectrolyte is obtained; (2) the dried positive plate is putted into low eutectic solvent, and active substances in the positive plate is dissolved in a high-temperature environment to obtain the reaction solution; (3) the reaction solution obtained in step (2) is filtered, washed, a filter cake is dried, collecting fluid, binder agent and conductive agent are obtained, the reducing agent is addedinto obtained filtrate, adjusting the obtained filtrate to be alkaline, and metal ions in the filtrate are reduced and precipitated; and (4) the filtrate containing precipitate in step (3) is filtered after the reduction reaction, the filter cake is dried and the transition elements are obtained, and the lithium element is obtained by means of extraction, precipitation, ion exchange and the like.The method is high in selectivity, high in leaching rate, simple to operate, low in cost, low in energy consumption, safe and environment-friendly.

Description

technical field [0001] The invention relates to a method for recovering valuable elements in anode materials of waste lithium ion batteries, in particular to a method for recovering lithium and transition elements in anode materials of waste lithium batteries by a liquid phase method. Background technique [0002] The continuous consumption of fossil energy and the increasingly prominent environmental problems restrict the sustainable development of the economy. Accelerating the development of new energy industries is an inevitable requirement for adjusting the energy structure, improving the ecological environment, and changing the way of development and energy use. It is a strategic choice to improve the overall competitiveness and promote the development of related industries. Starting from energy conservation and emission reduction, the country vigorously promotes the development of new energy electric vehicles. According to the statistics of the planning goals of new en...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B26/12H01M10/54
CPCC22B7/006C22B26/12H01M10/54Y02P10/20Y02W30/84
Inventor 郑俊超汤林波刘洋贺振江罗紫艳凌敏
Owner CENT SOUTH UNIV
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