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A "self-driven" electrochemical lithium extraction method based on a "rocking chair" electrode system

A self-driven, electrochemical technology, applied in the field of electrochemical lithium extraction, can solve the problem of high energy consumption, reduce energy consumption, reduce energy waste, and achieve the effect of lithium selectivity coefficient and exchange capacity

Active Publication Date: 2021-04-06
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a "self-driven" electrochemical lithium extraction method based on the "rocking chair" structure electrode system to solve the problem of electrochemical lithium extraction process based on the "rocking chair" structure electrode system in the prior art. There is a problem of high energy consumption and the "Trade-off" effect presented

Method used

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  • A "self-driven" electrochemical lithium extraction method based on a "rocking chair" electrode system
  • A "self-driven" electrochemical lithium extraction method based on a "rocking chair" electrode system
  • A "self-driven" electrochemical lithium extraction method based on a "rocking chair" electrode system

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Embodiment 1

[0037] A "self-driven" electrochemical lithium extraction method based on a "rocking chair" structure electrode system according to the present invention comprises the following steps:

[0038] (1) Construction of "rocking chair" structure electrode system

[0039] Self-made LiMn by high temperature solid phase method 2 o 4 Powder, with the obtained LiMn 2 o 4 Mix with carbon black and LA132 binder at a mass ratio of 8:1:1, add 50% ethanol solvent to stir thoroughly, and disperse ultrasonically for 3 minutes to obtain a uniformly dispersed slurry, and evenly coat the obtained slurry on 3.5* On a 5cm carbon fiber cloth, the coating thickness is about 5-6mg / cm 2 , and dried at 70°C for 12 hours to obtain a lithium-rich electrode;

[0040] The resulting lithium-rich LiMn 2 o 4 The electrode is connected to the positive electrode, and the AgCl electrode is connected to the negative electrode, and placed in a 0.05mol / L KCl solution for a constant voltage 1.2V reaction. When ...

Embodiment 2

[0054] A "self-driven" electrochemical lithium extraction method based on a "rocking chair" structure electrode system according to the present invention comprises the following steps:

[0055] (1) Construction of "rocking chair" structure electrode system

[0056] Self-made LiMn by high temperature solid phase method 2 o 4 Powder, with the obtained LiMn 2 o 4 Mix with carbon black and LA132 binder at a mass ratio of 8:1:1, add 50% ethanol solvent to stir thoroughly, and disperse ultrasonically for 3 minutes to obtain a uniformly dispersed slurry, and coat the resulting slurry on a surface of 3.5*5cm On the carbon fiber cloth, the coating thickness is about 5-6mg / cm 2 , dried at 70°C for 12 hours to obtain a lithium-rich electrode;

[0057] The resulting lithium-rich LiMn 2 o 4 The electrode is connected to the positive electrode, and the AgCl electrode is connected to the negative electrode, and placed in a 0.05mol / L KCl solution for constant voltage 0.8V reaction, and...

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Abstract

The invention belongs to the technical field of electrochemical lithium extraction, and specifically relates to an electrochemical lithium extraction method based on a "rocking chair" structure electrode system to realize high selectivity and low energy consumption extraction of dissolved rare lithium resources. The "self-driven" electrochemical lithium extraction method based on the "rocking chair" structure electrode system described in the present invention is based on the existing electrochemical lithium extraction method based on the "rocking chair" structure electrode system. The "drive" process is used in the electrochemical lithium extraction method, using the self-potential difference between electrodes in different states in the "rocking chair" structure electrode system to carry out self-driving (even energy recovery) process to extract lithium, so that the two electrodes first use the smaller potential difference between themselves Lithium extraction is carried out, and then further lithium is extracted by applying an external electric field, which effectively reduces the energy consumption of the lithium extraction process, and realizes the synchronous improvement of the electrode-to-lithium exchange capacity and selectivity coefficient, which has significant technical advantages.

Description

technical field [0001] The invention belongs to the technical field of electrochemical lithium extraction, and specifically relates to an electrochemical lithium extraction method based on a "rocking chair" structure electrode system to realize high-selectivity and low-energy extraction of solution-state dilute lithium resources. Background technique [0002] Lithium is the lightest metal in nature and has very active chemical properties. It is known as "energy metal". Lithium metal and its compounds are widely used in glass, ceramics, metallurgy, lubricants, refrigerants and other industries, as well as aviation and national defense. , electronics and other fields. Especially in recent years, due to the advantages of light weight, small size, long life, and high energy density, lithium batteries have been widely used, especially with the rapid rise and rapid development of emerging industries such as electric vehicles, wind power, and nuclear power. The demand for resource...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25B1/14
CPCC25B1/14
Inventor 纪志永郭志远袁俊生刘杰赵颖颖杨凤娟王军郭小甫王士钊李非
Owner HEBEI UNIV OF TECH
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