文献类型：期刊文献

英文题名：Thermodynamic corrections of high salinity system for selective lithium extraction from brines with LiMn2O4/λ-MnO2

作者：Wang, Penglin[1];Zhou, Shiyu[1];Fu, Yu[2,3];Fang, Hualiang[2,3];Gu, Shuai[1];Yu, Jianguo[1]

机构：[1]East China Univ Sci & Technol, Natl Engn Res Ctr Integrated Utilizat Salt Lake Re, Shanghai 200237, Peoples R China;[2]East China Univ Sci & Technol, Joint Int Lab Potassium & Lithium Strateg Resource, Shanghai, Peoples R China;[3]East China Univ Sci & Technol, Sch Chem Engn, Shanghai 200237, Peoples R China

年份：2024

卷号：581

外文期刊名：DESALINATION

收录：;EI(收录号：20241615917085);WOS:【SCI-EXPANDED(收录号:WOS:001239453100001)】；

基金：This work was supported by the Shanghai Sailing Program [grant number 21YF1409000] , the Nature Science Foundation of Shanghai [grant number 22ZR1415800] , and the National Natural Science Foundation of China [grant number 52304422] .

语种：英文

外文关键词：LiMn2O4/lambda-MnO2 redox couple; Thermodynamic calculations; Manganese dissolution; Electrochemically switched ion exchange

摘要：LiMn2O4/lambda-MnO2 redox couple, possessing the advantage of high selectivity and intercalation capacity, is the most promising candidate for efficient electrochemically switched ion exchange (ESIX) from salt-lake brines. Currently Eh-pH diagrams are the main means for studying the dissolution mechanism of LiMn2O4/lambda-MnO2 redox couple, however, the dissolution behavior obtained from experiments deviates significantly from the thermodynamic calculations. By introducing ionic strength correction into the thermodynamic calculation matrix of high salinity system, precise species distributions of Mn3+/Mn2+ are successfully predicted, which are in good accordance with the experimental results. Based on the novel thermodynamic calculations, the strong dependence between pH and the dominant species of Mn3+/Mn2+ is clarified, which in return determines the manganese dissolution (MD) behavior and intercalation capacity of the redox couple. The MD behavior differentiation between LiMn2O4 and lambda-MnO2 electrodes is induced by the electrode potential and pH. At pH > 5, high capacity (>30 mg/g) and low MD ratio (<0.1 %) can be achieved. This research sheds light on the existence status of Mn3+ on the MD behavior and suggests the reasonable application range of ESIX with LiMn2O4/lambda-MnO2 redox couple.