Optimization And Performance Research Of Electrolysis-based Seawater Lithium Extraction Technology

Based on the shortage of lithium resources and the rapid development of new energy,it is very important to find new lithium resource output.The subject of this article is the electrochemical seawater lithium extraction technology in the seawater lithium extraction technology in recent years.Corrosion of the core solid electrolyte of lithium and proposed an anti-corrosion method to promote the process of commercialization.Not only did various technical advantages and disadvantages of this technology and future possibility analysis,but also related improvements and enhancements.First of all,I read a lot of literature to understand the electrochemical seawater lithium extraction technology,and based on this,the three-electrode seawater lithium extraction technology was creatively proposed.At the same time,according to the needs of the device,the selection of a suitable third transfer electrode and organic electrolyte was greatly improved.Improved the stability of lithium extraction from seawater.（1）In order to improve the possibility of industrialization in the future,we studied the corrosion of the solid electrolyte in the three-electrode lithium extraction model.The garnet-based Li_6.75La₃Al_0.25Zr₂O₁₂（LLAZO）,as a popular solid electrolyte,is very It is easily corroded by air,which leads to a decrease in mechanical strength,lithium ion conductivity and wettability.This paper studies the corrosion behavior of garnet electrolyte in air（carbon dioxide,water vapor,CO₂+H₂O mixed air,actual humid air）and solution（distilled water,Na Cl solution,natural sea water）,and determines the corrosion resistance of the electrolyte to seawater Sex is very poor.Then,through a physical deposition method,the growth of the polyvinylidene fluoride（PVDF）nano-hydrophobic layer on the garnet was realized.When the relative humidity is 80%,the crystallization resistance（Rg）and grain boundary resistance（Rgb）of the solid electrolyte electrolyte with PVDF coating in 50 hours only increase by 14%and 170%,respectively.Well below the 930%and 2240%unmodified samples.And even after being immersed in a 353 K solution for 15 days,the modified electrolyte still has the original morphology through SEM observation.The excellent chemical corrosion resistance makes the prepared garnets have huge potential applications in the future development.（2）Three-electrode seawater lithium extraction method:not only selects the transfer electrode Li₄Ti₅O₁₂ from a variety of electrodes,but also reduces the multi-electrode threshold voltage of the entire three-electrode lithium extraction system to2.3V.The safety and stability are improved,and at the same time,a suitable perfluorinated electrolyte is selected,which has high chemical stability to the transfer electrode and lithium metal,and avoids the formation of lithium dendrites.The entire Li₄Ti₅O₁₂/Li battery showed excellent cycle performance in 250 cycles,with a coulombic efficiency of 99.3%and a capacity retention rate of 95%.