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Method for extracting lithium from lithium-contained solution based on LiMn2O4 electrode material

A technology of electrode material and lithium solution, which is applied in the electrochemical field of extracting lithium from lithium-containing solution based on lithium battery electrode materials, can solve problems such as low lithium insertion efficiency, corrosion of equipment environment, hazards, etc., and achieves convenient operation and environmental friendliness , The effect of simple process

Active Publication Date: 2017-09-26
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Manganese dioxide ion sieve is non-toxic, low in cost, and highly selective to lithium ions, but hydrochloric acid is needed in the process of preparing lithium ion sieve and elution of lithium ions, so it will corrode equipment and cause harm to the environment
Research proves that LiFePO 4 The material has good electrochemical reversibility in aqueous solution system, first in LiNO 3 Lithium intercalation at constant potential is carried out in aqueous solution, and then LiFePO after lithium intercalation 4 The material undergoes constant potential delithiation, and the Li embedded in the material + Released into deionized aqueous solution, becoming a Li-containing + Aqueous solution, thus achieving the purpose of electrode extraction of lithium ions, but calculated LiFePO 4 The lithium intercalation efficiency of the material is low (about 35%)

Method used

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  • Method for extracting lithium from lithium-contained solution based on LiMn2O4 electrode material
  • Method for extracting lithium from lithium-contained solution based on LiMn2O4 electrode material
  • Method for extracting lithium from lithium-contained solution based on LiMn2O4 electrode material

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Embodiment 1

[0034] (1) Preparation of lithium-rich electrodes:

[0035] LiMn 2 o 4 After the powder is fully mixed with the conductive agent acetylene black and the binder PTFE according to the mass ratio of 80:10:10, add an appropriate amount of ethanol to make it into a slurry, and apply it on the surface of the carbon cloth. The effective area of ​​the carbon cloth is 3.5×3cm 2 , the coating quality is about 10mg / cm 2 , placed at 70°C for 12h and dried to make lithium-rich LiMn 2 o 4 electrode.

[0036] (2) Preparation of lithium-poor electrode:

[0037] Take LiMn 2 o 4 The electrode is the positive electrode (i.e., the anode), and the AgCl electrode is used as the negative electrode (i.e., the cathode), which is placed in an electrolytic cell, and 0.05mol / L KCl solution is used as the electrolyte, and electrochemical delithiation is carried out at a constant voltage of 0.8V. When the current value is as low as 0.2mA, the reaction stops, and lithium-poor Li 1-x mn 2 o 4 elec...

Embodiment 2

[0046] (1) Preparation of lithium-rich electrodes:

[0047] LiMn 2 o 4 After the powder is fully mixed with the conductive agent acetylene black and the binder PTFE according to the mass ratio of 80:10:10, add an appropriate amount of ethanol to make it into a slurry, and apply it on the surface of the carbon cloth. The effective area of ​​the carbon cloth is 3.5×3cm 2 , the coating quality is about 8mg / cm 2 , placed at 70°C for 12h and dried to make lithium-rich LiMn 2 o 4 electrode.

[0048] (2) Preparation of lithium-poor electrode:

[0049] Take LiMn 2 o 4 The electrode is the positive electrode (i.e., the anode), and the AgCl electrode is used as the negative electrode (i.e., the cathode), which is placed in the electrolytic cell, and 0.05mol / L KCl solution is used as the electrolyte, and the electrochemical oxidation is carried out at a voltage of 0.8V. When the current value is as low as 0.2mA, the reaction stops, and lithium-poor Li 1-x mn 2 o 4 electrode. ...

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Abstract

The invention discloses a method for extracting lithium from a lithium-contained solution based on a LiMn2O4 electrode material. The method comprises the steps that LiMn2O4 powder, a conductive additive and a binding agent are mixed, the surface of a current collector is coated with the mixture, a LiMn2O4 electrode is prepared, lithium extraction treatment is carried out under constant voltage to obtain a Li1-xMn2O4 electrode, the LiMn2O4 electrode and the Li1-xMn2O4 electrode are placed into a recycling solution and an extraction solution which are isolated by an anion exchange membrane, a constant voltage reaction is carried out, lithium ions can be selectively inserted and extracted at the same time, the lithium insertion reaction and the lithium extraction reaction are combined to be carried out at the same time, and finally lithium ion enrichment and extraction are achieved. The electrochemical lithium extraction method is efficient, low in consumption and environmentally friendly.

Description

technical field [0001] The invention relates to a method for extracting lithium resources from an aqueous solution, in particular to an electrochemical method for extracting lithium from a lithium-containing solution based on lithium battery electrode materials. Background technique [0002] Lithium is the lightest metal in nature and has very active chemical properties. Lithium metal and its compounds are widely used in industries such as glass, metallurgy, ceramics, lubricants, and refrigerants. At the same time, with the rapid rise of emerging industries such as electric vehicles, wind power, and nuclear power, the demand for lithium resources in social development is also gradually showing leaps and bounds. increase. At present, the extraction of lithium resources has shifted from ore lithium extraction to salt lake brine and seawater lithium extraction. Therefore, how to effectively extract lithium resources from salt lake brine and seawater has become a research hotsp...

Claims

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Application Information

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IPC IPC(8): C22B26/12
CPCC22B26/12
Inventor 纪志永袁俊生赵颖颖刘杰赵孟瑶
Owner HEBEI UNIV OF TECH
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