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Method for recycling and regenerating lithium cobalt oxide from waste lithium ion batteries

A technology for lithium-ion batteries and regenerated lithium cobalt oxide, which is applied in the field of non-ferrous metal metallurgy, can solve problems such as high heat treatment temperature, large equipment corrosion, and poor performance of positive electrode materials, and achieve high metal recovery rate, low requirements for recovery process conditions, and The effect of low leaching temperature requirement

Active Publication Date: 2020-01-10
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method has disadvantages such as high heat treatment temperature, large corrosion to equipment, or poor performance of regenerated positive electrode materials.

Method used

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  • Method for recycling and regenerating lithium cobalt oxide from waste lithium ion batteries
  • Method for recycling and regenerating lithium cobalt oxide from waste lithium ion batteries
  • Method for recycling and regenerating lithium cobalt oxide from waste lithium ion batteries

Examples

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preparation example Construction

[0023] The invention provides a method for recovering and regenerating lithium cobalt oxide from waste lithium ion batteries. In an exemplary embodiment of the method for recovering and regenerating lithium cobaltate in the waste lithium-ion battery of the present invention, as figure 1 Shown, described preparation method comprises:

[0024] S01, peeling off the aluminum sheet from the positive electrode sheet of the waste lithium-ion battery to obtain the positive electrode active material;

[0025] S02, preparation of deep eutectic solvent;

[0026] S03, adding the positive electrode active material into the deep eutectic solvent, stirring and leaching at 50°C to 80°C, and obtaining carbon-containing filter residue and filtrate containing cobalt and lithium after solid-liquid separation;

[0027] S04, diluting the filtrate containing cobalt and lithium, stirring and standing, and obtaining a filter residue containing cobalt oxalate and a filtrate containing lithium after s...

example 1

[0042] (1) Fully discharge the waste lithium-ion battery, disassemble it to obtain the waste positive electrode sheet, then place it in a high-temperature furnace, heat-treat it at a temperature of 550°C for 1 hour, peel off the aluminum sheet, and obtain the positive electrode active material, wherein the positive electrode active material Lithium cobaltate.

[0043] (2) Choline chloride and oxalic acid are formulated into a choline chloride-oxalic acid deep eutectic solvent according to a molar ratio of 1:1.

[0044] (3) Add the lithium cobaltate positive electrode active material obtained in step (1) to the deep eutectic solvent prepared in step (2), stir and leach for 5 hours at 50°C, and separate solid and liquid to obtain carbon filter residue and Cobalt, lithium metal filtrate.

[0045] (4) Add distilled water to the filtrate obtained in step (3) to dilute, stir evenly and let stand for 20min, obtain cobalt oxalate filter residue A and lithium-containing solution B thr...

example 2

[0049] (1) Fully discharge the waste lithium-ion battery, disassemble it to obtain the waste positive electrode sheet, then place it in a high-temperature furnace for heat treatment at a temperature of 550° C. for 1 hour, peel off the aluminum sheet, and obtain the positive electrode active material, wherein the positive electrode active material is Lithium manganese cobaltate.

[0050] (2) Choline chloride and oxalic acid are formulated into a choline chloride-oxalic acid deep eutectic solvent according to a molar ratio of 1:1.

[0051] (3) adding the lithium manganese cobaltate positive electrode active material obtained in step (1) to the deep eutectic solvent prepared in step (2), stirring and leaching for 2 hours at 80° C., and solid-liquid separation to obtain carbon filter residue and Filtrate containing cobalt, lithium and other metals.

[0052] (4) Add distilled water to the filtrate obtained in step (3) to dilute, stir evenly and let stand for 10min, obtain mixture ...

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Abstract

The invention provides a method for recycling and regenerating lithium cobalt oxide from waste lithium ion batteries. The method comprises the following steps: stripping an aluminum sheet from a positive plate of a waste lithium ion battery to obtain a positive active substance; preparing a deep eutectic solvent which is choline chloride-oxalic acid, glycine betaine-oxalic acid or hydroxypropyl trimethyl ammonium chloride-oxalic acid; adding the positive active substance into the deep eutectic solvent, stirring and leaching at 50-80 DEG C, and carrying out solid-liquid separation to obtain carbon-containing filter residue and filtrate containing cobalt and lithium; diluting the filtrate containing cobalt and lithium, stirring, standing, and carrying out solid-liquid separation to obtain afilter residue containing cobalt oxalate and a filtrate containing lithium; introducing carbon dioxide gas or adding carbonic acid into the lithium-containing filtrate, and filtering to obtain a lithium carbonate precipitate; and drying, grinding, mixing and roasting the cobalt oxalate-containing filter residue and the lithium carbonate precipitate to obtain lithium cobalt oxide. The method is simple in process and high in metal recovery rate; and the recovery process is low in condition requirement, low in leaching temperature requirement and environment-friendly.

Description

technical field [0001] The invention relates to the technical field of nonferrous metal metallurgy, and more specifically, relates to a method for recovering and regenerating lithium cobaltate from waste lithium ion batteries. Background technique [0002] Lithium-ion batteries using lithium cobalt oxide as the cathode material have been widely used in small mobile electronic devices, electric vehicles and other fields since their commercial application in the 1990s. However, the average service life of this type of lithium-ion battery is about 3 to 5 years, and more than 10 billion such lithium-ion batteries have been scrapped at present. Therefore, the recycling of such waste lithium-ion batteries is very important, not only to reduce environmental pollution, but also to alleviate the tight supply and demand of cobalt resources. [0003] The recycling of waste lithium-ion batteries can be roughly divided into: pre-treatment of batteries, separation of positive electrode m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G51/00H01M10/0525H01M10/54
CPCC01G51/42H01M10/54H01M10/0525C01P2002/72C01P2004/03Y02W30/84Y02E60/10
Inventor 徐存英任相于华一新张启波汝娟坚李艳李坚
Owner KUNMING UNIV OF SCI & TECH
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