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Probing the Electrode–Electrolyte Interface of Sodium/Glyme-Based Battery Electrolytes
Dodangodage Ishara Senadheera ; Orlando Carrillo-Bohorquez ; Ernest O. Nachaki , et al. J. Phys. Chem. C,2024,128(14):5798-5808. DOI: 10.1021/acs.jpcc.3c08083
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Abstract: Sodium-ion batteries (NIBs) are promising systems for large-scale energy storage solutions; yet, further enhancements are required for their commercial viability. Improving the electrochemical performance of NIBs goes beyond the chemical description of the electrolyte and electrode materials as it requires a comprehensive understanding of the underlying mechanisms that govern the interface between electrodes and electrolytes. In particular, the decomposition reactions occurring at these interfaces lead to the formation of surface films. Previous work has revealed that the solvation structure of cations in the electrolyte has a significant influence on the formation and properties of these surface films. Here, an experimentally validated molecular dynamics study is performed on a 1 M NaTFSI salt in glymes of different lengths placed between two graphite electrodes having a constant bias potential. The focus of this study is on describing the solvation environment around the sodium ions at the electrode–electrolyte interface as a function of glyme chain length and applied potential. The results of the study show that the diglyme/TFSI system presents features at the interface that significantly differ from those of the triglyme/TFSI and tetraglyme/TFSI systems. These computational predictions are successfully corroborated by the experimentally measured capacitance of these systems. In addition, the dominant solvation structures at the interface explain the electrochemical stability of the system as they are consistent with cyclic voltammetry characterization.
Purchased from AmBeed: 91742-21-1
CAS No. : | 91742-21-1 | MDL No. : | MFCD14156021 |
Formula : | C2F6NNaO4S2 | Boiling Point : | - |
Linear Structure Formula : | - | InChI Key : | YLKTWKVVQDCJFL-UHFFFAOYSA-N |
M.W : | 303.14 | Pubchem ID : | 11077530 |
Synonyms : |
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Signal Word: | Danger | Class: | 8 |
Precautionary Statements: | P280-P305+P351+P338-P310 | UN#: | 3261 |
Hazard Statements: | H314 | Packing Group: | Ⅲ |
GHS Pictogram: |
* All experimental methods are cited from the reference, please refer to the original source for details. We do not guarantee the accuracy of the content in the reference.