文献类型：期刊文献

英文题名：Electrochemical quartz crystal microbalance study of lithium-ion dynamics in LiMn2O4/A-MnO2 for ion-selective capacitive deionization

作者：Jia, Hongkun[1];Wang, Penglin[1];Jin, Lei[3];Gu, Shuai[1,2];Yu, Jianguo[1,2]

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 200237, Peoples R China;[3]Macau Univ Sci & Technol, State Key Lab Lunar & Planetary Sci, Macau 999078, Peoples R China

年份：2025

卷号：513

外文期刊名：ELECTROCHIMICA ACTA

收录：;WOS:【SCI-EXPANDED(收录号:WOS:001402569100001)】；

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

语种：英文

外文关键词：Intercalate phase transformation; Electrochemical quartz crystal microbalance; Self-driven intercalation

摘要：Lithium manganese oxide (LMO) has been widely utilized in capacitive deionization (CDI) for selective lithium extraction from salt-lake brines, owing to its excellent lithium intercalation capacity, selectivity, and recovery efficiency. However, due to the lack of an in-situ detection method, the LMO electrode kinetics in aqueous solution is mainly based on deductions and inferences. Here, electrochemical workstation-quartz crystal micro- balance is utilized to study the lithium dynamics in LiMn2O4/A-MnO2 in aqueous system for the first time. In-situ electrochemical analysis verifies that the lithium intercalation and deintercalation during the redox of LiMn2O4/ A- MnO 2 is a one-electron transfer quasi-reversible process. The intermediate phase, i.e., Li 0.5 Mn 3 + 0.5Mn4+ 1.5O4 with P 2 1 3 space group and layered structure, is first identified in between LiMn2O4 and A- MnO 2 with Fd3m space group and spinel structures in the aqueous system. Li+ occupies the 4a and 8a sites, respectively, in Li 0.5 Mn 3 + 0.5Mn4+ 1.5O4 and LiMn2O4. Also, the spontaneous lithiation of A- MnO 2 and faster lithiation kinetics than that of delithiation is clarified with electrochemical analyses. This research utilized the in-situ research means to interpret the lithium dynamics during the lithiation and delithiation process, which sheds light on the issues on which there is no consensus.