High-selectivity lithium extraction electrode and preparation method thereof

A high-selectivity, lithium electrode technology, applied in the direction of process efficiency improvement, coating, surface coating liquid device, etc., can solve the problems of low electrode current density, low lithium selectivity, etc., to improve the extraction rate, Effect of improving selectivity and current density and avoiding shedding

Active Publication Date: 2021-08-20
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problems of low current density and low selectivity to lithium in high-hetero-hetero-bitter brine, the present invention aims to provide an electrode with high lithium-improving efficiency and high selectivity and its preparation technology

Method used

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  • High-selectivity lithium extraction electrode and preparation method thereof
  • High-selectivity lithium extraction electrode and preparation method thereof
  • High-selectivity lithium extraction electrode and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Preparation of lithium iron phosphate electrode: (1) Put the active material of lithium iron phosphate into 5g / L dopamine salt solution according to the solid-liquid mass ratio of 1:5, control the reaction temperature at 20°C, the pH value of the solution at 8.5, and stir for 15 hours. After the reaction is finished, filter and wash, and dry the filter residue at 100°C; (2) add polyethylene glycol and PVDF to N-methylpyrrolidone solvent, and stir until completely dissolved in vacuum; (3) add polydopamine-modified Lithium iron phosphate powder, acetylene black, pore-forming agent solid NaCl, and short carbon fibers with a length of 2mm were added in proportion to the N-methylpyrrolidone glue, and vacuum mechanically stirred for 6 hours to obtain a uniformly dispersed electrode slurry; (4) the obtained The electrode slurry is uniformly coated on a titanium mesh with a thickness of 1mm and an area of ​​40cm×50cm, and the coating density of the lithium iron phosphate active ...

Embodiment 2

[0054] Preparation of lithium iron phosphate electrode: (1) Put the active material of lithium iron phosphate into 2g / L dopamine salt solution according to the solid-liquid mass ratio of 1:5, control the reaction temperature at 25°C, the pH value of the solution at 9, and stir for 20 hours. After the reaction is finished, filter and wash, and dry the filter residue at 100°C; (2) add polyethylene glycol, chitosan, and PVDF to N-methylpyrrolidone solvent and mechanically stir until completely dissolved; (3) modify polydopamine Lithium iron phosphate powder, conductive agent acetylene black, pore-forming agent solid KCl, and short carbon fibers with a length of 1 mm were added in proportion to the N-methylpyrrolidone glue, and vacuum mechanically stirred for 6 hours to obtain a uniformly dispersed slurry; (4 ) The obtained slurry is evenly coated on a carbon fiber cloth with a thickness of 1 mm and an area of ​​40 cm × 50 cm, and the coating density of the lithium iron phosphate a...

Embodiment 3

[0058] Preparation of lithium manganate electrode: (1) Put lithium manganate active material into 4g / L dopamine salt solution according to the solid-liquid mass ratio of 1:5, control the reaction temperature at 20°C, the pH value of the solution at 9.5, and stir for 10 hours. After the reaction is finished, filter and wash, and dry the filter residue at 100°C; (2) add polyethylene glycol, polyvinyl alcohol, and PVDF to N-methylpyrrolidone solvent and stir mechanically until they are completely dissolved; (3) modify polydopamine Lithium manganate powder, acetylene black, pore-forming agent solid NaCl, and short carbon fibers with a length of 2.5 mm were added in proportion to the N-methylpyrrolidone glue, and vacuum mechanically stirred for 8 hours to obtain a uniformly dispersed slurry; (4) The obtained slurry is evenly coated on a carbon fiber cloth with a thickness of 1mm and an area of ​​40cm×50cm, and the coating density of the lithium manganate active material after drying...

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Abstract

The invention relates to a high-selectivity and hydrophilcity electrode for electrochemical lithium extraction and a preparation method thereof. The preparation method comprises: carrying out surface coating modification on an electrode active substance by adopting polydopamine; and by utilizing the effects of preferential aggregation and lithium ion transmission of the polydopamine, interception on foreign ions is implemented and the selectivity of the electrode active substance to lithium is improved. In the pulping process of an electrode adsorption material, a polar hydrophilic organic high-molecular compound containing hydroxyl is introduced for blending modification, so that the hydrophilicity of an adhesive PVDF is improved. In addition, inorganic salt pore-forming is combined with a drying mode of 'firstly low temperature and then high temperature', so that the electrode forms a'porous-microcrack' morphology, and the mass transfer effect of solution in an electrode plate is improved. The electrode preparation method disclosed by the invention has the characteristics of simplicity, feasibility, environmental friendliness, low cost and the like, and is easy for industrial production.

Description

technical field [0001] The invention belongs to the field of lithium extraction from salt lakes, and specifically relates to a high-selectivity electrode used in the electrochemical deintercalation method solution lithium extraction technology and a preparation method thereof. Background technique [0002] In recent years, with the rapid development of new energy vehicles and chemical energy storage, the demand for lithium has surged. Salt lake brine has a huge amount of lithium resources (accounting for about 70% of the global lithium resource reserves), so lithium extraction from salt lakes has attracted more and more attention. [0003] The lithium concentration in salt lake brine is low, and contains much higher concentrations of impurity elements such as sodium, magnesium, potassium, boron, etc., which brings great difficulties to lithium extraction. Aiming at the problem of extracting lithium from salt lakes, an electrochemical deintercalation method for separating an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B26/12C22B3/02C22B3/42B05D7/24
CPCC22B26/12C22B3/02C22B3/42B05D7/24Y02P10/20Y02E60/10
Inventor 赵中伟何利华
Owner CENT SOUTH UNIV
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