文献类型：期刊文献

英文题名：Targeted electro-redox facilitating efficient delithiation of lithium manganese ion-sieve selective electrode

作者：Wang, Yaqiu;Jia, Hongkun;Li, Shengwu;Gu, Shuai[1];Yu, Jianguo

机构：[1]East China Univ Sci & Technol, Natl Engn Res Ctr Integrated Utilizat Salt Lake Re, Shanghai 200237, Peoples R China; East China Univ Sci & Technol, Engn Res Ctr Salt Lake Resources Proc Engn, Minist Educ, Shanghai, Peoples R China; East China Univ Sci & Technol, Joint Int Lab Potassium & Lithium Strateg Resource, Shanghai 200237, Peoples R China

年份：2023

卷号：565

外文期刊名：DESALINATION

收录：;EI(收录号：20233114459825);WOS:【SCI-EXPANDED(收录号:WOS:001054820200001)】；

基金：This work was supported by the Shanghai Sailing Program [grant number 21YF1409000] and the Nature Science Foundation of Shanghai [grant number 22ZR1415800] .

语种：英文

外文关键词：Cell voltage; Electrochemical delithiation; Electrically switched ion exchange; Mechanism

摘要：The electrically switched ion exchange (ESIX), as the most promising technique for the efficient extraction of lithium from brine, especially the lithium manganese ion-sieve membrane electrode, possesses the advantages of high selectivity, high adsorption capacity, and high stability. And to enable the simultaneous lithium intercalation and de-intercalation at the cathode and anode, respectively, the selective electrode ought to be delithiated before use. Traditional chemical and electrochemical delithiation and electrochemical techniques consume enormous amounts of reagents and energy, respectively. Thermodynamics and electrochemical analysis indicated that the cathodic reaction induced the high cell voltage, which in turn caused the emitting of toxic gases and high energy consumption. Thus, in this study, a targeted-redox system was adopted to alleviate the above problems. By adding excessive Cu2+ into the cathode compartment, the cell voltages in 5 h reduced from 3 V to about 1.5 V and further reduced to 1.2 V if diluted HCl was also added. With lower cell voltage and higher current density, a higher delithiation rate can be reached (95.83 %). Furthermore, Cu2+ can be regenerated by bubbling O2 under an acidic atmosphere, which enables the re-utilization of the cathodic solution. The targeted electro-redox system can reduce 2980.49 J of the energy consumption compared with the current electrochemical delithiation method, meanwhile, the utilization of cheaper counter electrode makes it economically viable.