Electrochemical recovery method of lithium in cathode materials of waste lithium batteries

A technology for waste lithium batteries and positive electrode materials, which is applied in the field of electrochemical recovery of lithium in the positive electrode materials of waste lithium batteries, can solve the problems of non-continuous production and increased content of impurity elements, and achieve low cost, high purity, and high enrichment efficiency Effect

Active Publication Date: 2017-06-13
TIANQI LITHIUM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, during electrolysis, the Al in the lithium iron phosphate positive electrode of the battery 3+ , Fe 3+ and PO 4 3+ Plasma groups will enter the electrolyte at the same time, making the content of impurity elements in the electrolyte gradually increase; and continuous production is not possible

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] (1) Use monovalent cations to selectively permeate the nanofiltration membrane to vertically divide the electrolytic cell of the electrolysis device into two regions, the anode chamber and the cathode chamber, and inject Li into the anode chamber 2 SO 4 solution, the cathode chamber is injected with a low concentration of Li 2 SO 4 solution, and as the electrolysis proceeds, a certain amount of Li is continuously added to the anode compartment 2 SO 4 solution, and continuously discharge the lithium-rich electrolyte in the cathode compartment;

[0038] (2) The waste LiFePO 4 Lithium-ion battery cathode material is placed in the anode chamber as the anode, and the copper foil is placed in the cathode chamber as the cathode; under the action of a constant current of 0.5C, the anode waste LiFePO 4 Intercalation of Li in cathode materials for lithium-ion batteries + will be removed from the anode plate and enter the anode chamber Li 2 SO 4 In the solution, under the ...

Embodiment 2

[0040] (1) Use monovalent cations to selectively permeate the nanofiltration membrane to vertically divide the electrolytic cell of the electrolysis device into two regions, the anode chamber and the cathode chamber. The anode chamber is injected with LiCl solution, and the cathode chamber is injected with a low-concentration LiCl solution. In the process of electrolysis, a certain amount of LiCl solution is continuously added to the anode chamber, and the lithium-rich electrolyte in the cathode chamber is continuously discharged;

[0041] (2) The waste LiCoO 2 The positive electrode material of lithium ion battery is placed in the anode chamber as the anode, and the nickel sheet is placed in the cathode chamber as the cathode; under the action of constant current 2C, the anode waste LiCoO 2 Intercalation of Li in cathode materials for lithium-ion batteries + It will be removed from the anode plate and enter the LiCl solution in the anode chamber. Under the action of the elec...

Embodiment 3

[0043] (1) Use monovalent cations to selectively permeate the nanofiltration membrane to vertically divide the electrolytic cell of the electrolysis device into two regions, the anode chamber and the cathode chamber, and inject MgSO into the anode chamber 4 solution, the cathode chamber is injected with a low concentration of MgSO 4 solution, and as the electrolysis proceeds, a certain amount of MgSO is continuously added to the anode chamber 4 solution, and continuously discharge the lithium-rich electrolyte in the cathode compartment;

[0044] (2) The waste LiFePO 4 Lithium-ion battery cathode material is placed in the anode chamber as the anode, and the graphite sheet is placed in the cathode chamber as the cathode; under the action of a constant cell voltage of 2V, the anode waste LiFePO 4 Intercalation of Li in cathode materials for lithium-ion batteries + will be removed from the anode plate and enter the anode compartment MgSO 4 In the solution, under the action of ...

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PUM

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Abstract

The invention relates to a recovery method for lithium, and more particularly to an electrochemical recovery method of lithium in cathode materials of waste lithium batteries. The method comprises the following steps: dividing an electrolytic cell into two areas: an anode chamber and a cathode chamber by using a monovalent cation selective permeable membrane; taking the cathode materials of the waste lithium batteries as an anode, and taking at least one of a lithium salt solution, a divalent cationic electrolyte solution and a trivalent cationic electrolyte solution as an anode chamber electrolytic solution; taking an inert electrode material as a cathode, and taking a lithium salt solution as a cathode chamber electrolyte solution; applying external potential, enabling the lithium in the electrode materials of the waste lithium batteries to form li-ion dissolved in the anode chamber electrolyte solution, enabling the li-ion to enter into the cathode chamber for enrichment through monovalent cation selective permeable membrane, so as to obtain a lithium-rich solution. The method has the advantages of being simple and effective, low in cost and high in lithium enrichment efficiency, the recovery rate of lithium is up to 95% or more, the purity of lithium liquid is high, and continuous recovery of lithium in electrode materials of waste lithium batteries can be realized.

Description

technical field [0001] The invention relates to a method for recovering lithium, in particular to a method for electrochemically recovering lithium in positive electrode materials of waste lithium batteries. Background technique [0002] Since the first lithium-ion battery was developed by Japan's SONY company in the 1990s, lithium-ion batteries have developed rapidly. Due to the advantages of high working voltage, high energy density, light weight, and no memory effect, lithium-ion batteries have been widely used in portable devices such as mobile phones and notebook computers, satellites, power reserves, and as power batteries for electric vehicles. [0003] The large-scale application of lithium-ion batteries will inevitably produce a large number of scrapped lithium-ion batteries. In addition, in the production process of lithium-ion battery cathode materials, often due to production process requirements or production process and other reasons, tons of lithium-ion batter...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D61/48H01M10/54
CPCB01D61/48B01D2311/2603B01D2311/2684H01M10/54Y02W30/84
Inventor 曹乃珍高洁王蒙蒙陶帅徐川高宜宝李仕红
Owner TIANQI LITHIUM CORP
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