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An Atomic Insight into the Chemical Origin and Variation of the Dielectric Constant in Liquid Electrolytes
Author(s) -
Yao Nan,
Chen Xiang,
Shen Xin,
Zhang Rui,
Fu ZhongHeng,
Ma XiaXia,
Zhang XueQiang,
Li BoQuan,
Zhang Qiang
Publication year - 2021
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.202107657
Subject(s) - dielectric , solvation , electrolyte , chemistry , intermolecular force , chemical physics , solvent , molecular dynamics , molecule , thermodynamics , computational chemistry , materials science , organic chemistry , physics , electrode , optoelectronics
The dielectric constant is a crucial physicochemical property of liquids in tuning solute–solvent interactions and solvation microstructures. Herein the dielectric constant variation of liquid electrolytes regarding to temperatures and electrolyte compositions is probed by molecular dynamics simulations. Dielectric constants of solvents reduce as temperatures increase due to accelerated mobility of molecules. For solvent mixtures with different mixing ratios, their dielectric constants either follow a linear superposition rule or satisfy a polynomial function, depending on weak or strong intermolecular interactions. Dielectric constants of electrolytes exhibit a volcano trend with increasing salt concentrations, which can be attributed to dielectric contributions from salts and formation of solvation structures. This work affords an atomic insight into the dielectric constant variation and its chemical origin, which can deepen the fundamental understanding of solution chemistry.