@article{Yu2023, 
author = {Jinhe Yu and Weicheng Ren and Chang Yu and Zhao Wang and Yuanyang Xie and Jieshan Qiu},
title = {Enhanced Anion-Derived Inorganic-Dominated Solid Electrolyte Interphases for High-Rate and Stable Sodium Storage},
year = {2023},
journal = {Energy & Environmental Materials},
volume = {6},
number = {4},
keywords = {anion-derived inorganic-dominated SEI, electrolyte solvation chemistry, high rate and stability, sodium storage},
url = {https://www.sciopen.com/article/10.1002/eem2.12602},
doi = {10.1002/eem2.12602},
abstract = {It is highly desirable for the promising sodium storage possessing high rate and long stable capability, which are mainly hindered by the unstable yet conventional solvent-derived organic-rich solid electrolyte interphases. Herein, an electrolyte solvation chemistry is elaborately manipulated to produce an enhanced anion-derived and inorganic components-dominated solid electrolyte interphases by introducing a low permittivity (4.33) bis(2,2,2-trifluoroethyl) ether diluent into the sodium bis(trifluoromethylsulfonyl)imide-dimethoxyethane-based high concentration electrolyte to obtain a localized high concentration electrolyte. The bis(2,2,2-trifluoroethyl) ether breaks the balance of original cation solvation structure and tends to interact with Na+-coordinated dimethoxyethane solvent rather than Na+ in high concentration electrolyte, leaving an enhanced Coulombic interaction between Na+ and (FSO2)2N−, and more (FSO2)2N− can enter the Na+ solvation shell, forming a further increased number of Na+-(FSO2)2N−-dimethoxyethane clusters (from 82.0% for high concentration electrolyte to 94.3% for localized high concentration electrolyte) at a low salt dosage. The preferential reduction of this (FSO2)2N−-enriched clusters rather than the dimethoxyethane-dominated Na+ solvation structure produces an enhanced anion-derived and inorganic components-dominated solid electrolyte interphases. The reversible charge storage process of Na is decoupled by operando Raman along with a shift of D and G peaks. Benefiting from the enhanced anion-derived electrode-electrolyte interface, the commercial hard carbon anode in localized high concentration electrolyte shows a well rate capability (5 A g−1, 70 mAh g−1), cycle performance and stability (85% of initial capacity after 700 cycles) in comparison to that of high concentration electrolyte (68%) and low concentration electrolyte (only 5% after 400 cycles), indicative of uniqueness and superiorities towards stable Na storage.}
}