Anionic Effects on Concentrated Aqueous Lithium Ion Dynamics

• DOI: 10.1021/acs.jpclett.4c00585
• Publication Date: 2024-05-06T11:29:42Z
• Authors: Robert G. Felsted; Trent R. Graham; Yatong Zhao; J. David Bazak; Emily T. Nienhuis; Peter J. Pauzauskie; Alan G. Joly; Carolyn I. Pearce; Zheming Wang; Kevin M. Rosso
• Keywords: Dynamics

The dynamics, orientational anisotropy, diffusivity, viscosity, and density were measured for concentrated lithium salt solutions, including chloride (LiCl), bromide (LiBr), nitrite (LiNO2), nitrate (LiNO3), with methyl thiocyanate as an infrared vibrational probe molecule, using two-dimensional spectroscopy (2D IR), nuclear magnetic resonance (NMR) spectroscopy, viscometry. 2D IR, NMR, viscosity results show that LiNO2 exhibits longer correlation times, lower nearly 4 times greater compared to those of the other solutions same concentration, suggesting anions may strongly facilitate structure formation via strengthening water-ion network interactions, directly impacting bulk solution properties at sufficiently high concentrations. Additionally, LiNO3 significantly weakened chemical interactions between cations when halide salts.