A method for electrochemically extracting lithium from brine to suppress the interference of coexisting cations

A technology of lithium ions and cations, applied in the field of high-efficiency extraction of lithium chloride, can solve the problems of increasing the exchange capacity of lithium ion sieves, complex liquid membrane preparation process, poor stability, etc., and achieves the suppression of the interference of coexisting cations, the process is simple, and the cost is low. Effect

Active Publication Date: 2022-06-28
BEIJING UNIV OF CHEM TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the liquid membrane preparation process is complex, poor stability, and high cost. Therefore, it is urgent to develop a simple and low-cost method to suppress the interference of coexisting cations in lithium-containing brine, increase the exchange capacity of lithium ion sieves, and improve the efficiency of lithium extraction.

Method used

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  • A method for electrochemically extracting lithium from brine to suppress the interference of coexisting cations
  • A method for electrochemically extracting lithium from brine to suppress the interference of coexisting cations
  • A method for electrochemically extracting lithium from brine to suppress the interference of coexisting cations

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Experimental program
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Effect test

Embodiment 1

[0025] (1) Weigh 16g of spinel lithium manganate LiMn 2 O 4 , 2g acetylene black conductive agent, 2g polyvinylidene fluoride PVDF binder and 98g N-methylpyrrolidone NMP, dissolve the weighed polyvinylidene fluoride PVDF binder in N-methylpyrrolidone NMP, then add Weighed spinel LiMn 2 O 4 and acetylene black conductive additive, stir to form a slurry, which is uniformly coated on the titanium mesh current collector, LiMn 2 O 4 The loading of 5mg / cm 2 , and then vacuum dried at 50 °C for 10 h to obtain LiMn 2 O 4 Electrode; with LiMn 2 O 4 The electrode is the working electrode, the titanium mesh is the counter electrode, the Ag / AgCl electrode is the reference electrode, and the LiCl solution with a concentration of 0.01mol / L is used as the electrolyte solution to construct an electrochemical reaction system. The electrode is connected for constant current charging, and the current density is 0.05A / g LiMn 2 O 4 , the charge cut-off voltage is 1.0V (vs. Ag / AgCl), and...

Embodiment 2

[0031] (1) Weigh 18g spinel type lithium manganate LiMn 2 O 4 , 1g acetylene black conductive agent, 1g polyvinylidene fluoride PVDF binder and 19g N-methylpyrrolidone NMP, dissolve the weighed polyvinylidene fluoride PVDF binder in N-methylpyrrolidone NMP, then add Weighed spinel LiMn 2 O 4and acetylene black conductive additive, stir to form a slurry, which is uniformly coated on the titanium mesh current collector, LiMn 2 O 4 The load is 10mg / cm 2 , and then vacuum dried at 100 °C for 5 h to obtain LiMn 2 O 4 Electrode; with LiMn 2 O 4 The electrode is the working electrode, the titanium mesh is the counter electrode, the Ag / AgCl electrode is the reference electrode, and the LiCl solution with a concentration of 0.05mol / L is used as the electrolyte solution to construct an electrochemical reaction system. The electrode is connected for constant current charging, and the current density is 0.01A / g LiMn 2 O 4 , the charge cut-off voltage is 0.9V (vs.Ag / AgCl), and t...

Embodiment 3

[0036] (1) Weigh 18g spinel type lithium manganate LiMn 2 O 4 , 1g acetylene black conductive agent, 1g polyvinylidene fluoride PVDF binder and 19g N-methylpyrrolidone NMP, dissolve the weighed polyvinylidene fluoride PVDF binder in N-methylpyrrolidone NMP, then add Weighed spinel LiMn 2 O 4 and acetylene black conductive additive, stir to form a slurry, which is uniformly coated on the titanium mesh current collector, LiMn 2 O 4 The loading of 7mg / cm 2 , and then vacuum dried at 80 °C for 7 h to obtain LiMn 2 O 4 Electrode; with LiMn 2 O 4 The electrode is the working electrode, the titanium mesh is the counter electrode, the Ag / AgCl electrode is the reference electrode, and the LiCl solution with a concentration of 0.1 mol / L is used as the electrolyte solution to construct an electrochemical reaction system. The electrode is connected for constant current charging with a current density of 0.1A / g LiMn 2 O 4 , the charge cut-off voltage is 1.1V (vs.Ag / AgCl), and th...

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Abstract

The invention relates to a method for electrochemically extracting lithium from brine to suppress the interference of coexisting cations, which belongs to the technical field of lithium salt chemical industry. The electrochemical lithium extraction system adopts intermittent discharge during discharge and intercalation of lithium. When the discharge is suspended, the repulsion between cations can redistribute lithium ions and other metal cations in the solution, eliminating the coexistence formed on the surface of lithium ion sieve electrodes during discharge. The cationic layer makes it easy for lithium ions to approach the electrode surface of the lithium-ion sieve and diffuse into the lithium-ion sieve during subsequent discharge, thereby increasing the exchange capacity of the lithium-ion sieve and improving the efficiency of lithium extraction. The method of the invention has the advantages of simple operation process, low cost, etc., and is easy to implement industrially.

Description

technical field [0001] The invention relates to a method for electrochemically extracting lithium from brine to suppress the interference of coexisting cations, belonging to the technical field of lithium salt chemical industry, and is suitable for efficiently extracting chlorine from salt lakes, seawater, industrial waste brine and other brines containing LiCl and various high-concentration coexisting cations. Lithium. Background technique [0002] Lithium-ion batteries are widely used in portable electronic devices and new energy electric vehicles, expanding the market demand for lithium-ion batteries. It is urgent to develop lithium resources to provide high-quality and low-cost lithium raw materials for lithium-ion batteries. The use of electrochemical methods to extract lithium from brine lithium resources has the advantages of energy saving, environmental protection, and simple operation, and has attracted widespread attention in recent years. However, the composition...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25B1/14C25B15/02
CPCC25B1/14C25B15/02
Inventor 杨文胜王晓丽刘长霞
Owner BEIJING UNIV OF CHEM TECH
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