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Influence of Additives on the Electrochemical and Interfacial Properties of SiOx-Based Anode Materials for Lithium-Sulfur Batteries

Authors
Sathya, SwamickanAngulakshmi, N.Ahn, Jou-HyeonKathiresan, M.Stephan, A. Manuel
Issue Date
1-Mar-2022
Publisher
American Chemical Society
Citation
Langmuir, v.38, no.8, pp 2423 - 2434
Pages
12
Indexed
SCIE
SCOPUS
Journal Title
Langmuir
Volume
38
Number
8
Start Page
2423
End Page
2434
URI
https://scholarworks.gnu.ac.kr/handle/sw.gnu/1511
DOI
10.1021/acs.langmuir.1c02342
ISSN
0743-7463
1520-5827
Abstract
The influence of electrolyte additives on the electrochemical and interfacial properties of SiOx-based anodes for lithium-sulfur batteries (Li-S) was systematically investigated. Four different electrolyte additives, namely, lithium nitrate, vinylene carbonate (VC), vinyl ethylene carbonate, and fluoroethylene carbonate (FEC), were added to the bare electrolyte comprising 1 M LiTFSI in tetraethylene glycol dimethyl ether/1,3 dioxolane in a ratio of 1:1 (v/v). The self-extinguishing time (SET) of the liquid electrolytes was measured. The 2032-type half-cells composed of Li/SiOx/Si/C were assembled, and their charge-discharge studies were analyzed at the 0.1 Crate. Upon cycling, the electrode materials were subjected to surface morphology and differential scanning calorimetry analyses. The interfacial properties of SiOx-based electrodes were investigated by electrochemical impedance spectroscopy, Fourier transform infrared, and X-ray photoelectron spectroscopy studies. Among the electrolytes examined, FEC-added electrolytes offered the lowest SET and interfacial resistance values. The superior charge-discharge properties of FEC-added electrolytes were attributed to the formation of a stable solid electrolyte interface layer on the electrode surface. The surface chemistry studies revealed the formation of Li2CO3 and ROCO2Li peaks on the electrode surface.
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Ahn, Jou Hyeon
대학원 (나노신소재융합공학과)
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