Method for selectively separating lithium from positive electrode material of waste lithium-ion battery

A technology for lithium ion batteries and positive electrode materials, which is applied in the field of selective separation of positive electrode materials of waste lithium ion batteries, can solve the problems of non-selective separation, secondary pollution, long recycling process, etc., and achieves wide application range and no secondary Contamination, the effect of short separation times

Inactive Publication Date: 2018-05-01
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] In view of the above-mentioned problems existing in the prior art, the purpose of the present invention is to provide a method for selectively separating lithium from the positive electrode material of the waste lithium ion

Method used

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  • Method for selectively separating lithium from positive electrode material of waste lithium-ion battery
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  • Method for selectively separating lithium from positive electrode material of waste lithium-ion battery

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Embodiment 1

[0059] This embodiment provides a method for selectively separating lithium from the positive electrode sheet of a waste lithium-ion battery, and the specific method is as follows:

[0060] (1) Take the lithium cobalt oxide positive electrode sheet waste of lithium ion battery, and measure the mass percentage of metal in the positive electrode waste: Co: 45.28%, Li: 1.13%, Al: 2.06%.

[0061] (2) Take a part of the waste lithium cobaltate positive electrode sheet after step (1) drying, weigh the quality of the positive electrode sheet solid and measure the separation liquid (with a pH value of 4) with the separation liquid at a liquid-solid ratio of 0.6mL / g Acetic acid solution) liquid volume, put into reactor, add oxidizing additive sodium persulfate simultaneously in reaction system (taking the total mass of described separating liquid and oxidizing additive as 100%, the mass percentage composition of oxidizing additive is 3%), carry out reaction, control stirring speed 800r...

Embodiment 2

[0065] This embodiment provides a method for selectively separating lithium from the positive electrode sheet of the waste lithium ion battery. The specific method refers to Example 1, the difference is that the liquid-solid ratio of the positive electrode sheet of the waste lithium cobaltate and the separation liquid is 2mL / g. The results are shown in Table 1.

Embodiment 3

[0067] This embodiment provides a method for selectively separating lithium from the positive electrode sheet of the waste lithium ion battery. The specific method refers to Example 1, the difference is that the liquid-solid ratio of the waste lithium cobaltate positive electrode sheet and the separation liquid is 10mL / g. The results are shown in Table 1.

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Abstract

The invention discloses a method for selectively separating lithium from a positive electrode material of a waste lithium-ion battery. The method comprises the following steps of (1) reacting a positive plate of the waste lithium-ion battery with a separation liquid, adding an oxidative additive and/or introducing an oxidative gas into a reaction system, breaking a Li-O bond in the positive electrode material of the waste lithium-ion battery, stabilizing crystal structures of other residual metal elements, selectively entering the lithium into a solution and leaving the other metal wastes except for the lithium, and aluminum foil in solid residues; and (2) carrying out solid-liquid separation to obtain a lithium-rich solution and the solid residues, wherein the separation liquid is an acidsolution of which the pH is greater than 3 or an alkaline solution of which the pH is smaller than 10. The invention provides a short-process method for selectively separating the lithium. The separation efficiency of the lithium from the positive electrode material of the waste lithium-ion battery is high, the separation time is short, the cost is low, a recovery process is free of pollution andindustrial production is easy to implement.

Description

technical field [0001] The invention belongs to the technical field of lithium ion battery recycling, and in particular relates to a selective separation method for anode materials of waste lithium ion batteries. Background technique [0002] With the wide application of lithium-ion batteries in mobile phones, notebook computers, digital equipment, electric vehicles, and smart grids, and the life of lithium-ion batteries is generally about three years, electronic products are updated relatively quickly, and a large number of waste lithium-ion batteries are produced every year. ; In addition, production waste is also generated during the production process. These large quantities of discarded lithium-ion batteries will cause considerable environmental pollution pressure. If used lithium-ion batteries are randomly discarded in the environment, harmful substances will enter the soil and water bodies, causing pollution, and eventually enter the human body and animals through th...

Claims

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Application Information

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IPC IPC(8): H01M10/54C22B7/00C22B26/12
CPCC22B7/007C22B7/008C22B26/12H01M10/54Y02P10/20Y02W30/84
Inventor 孙峙杨勇霞林晓曹宏斌张懿
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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