A new comparative investigation of lithium sulfur cells employing a tetraethylene glycol dimethyl ether−lithium trifluoromethanesulfonate (TEGDME-LiCF3SO3) electrolyte charged by various polysulfide species (Li2S2,Li2S4, Li2S6, and Li2S8) is here reported. We carefully detect the effects of lithium polysulfide addition by originally combining X-ray photoelectron spectroscopy (XPS) and electrochemical impedance spectroscopy (EIS). The measurements clearly reveal how the polysulfide addition affects the nature and composition of the solid electrolyte interphase (SEI) in terms of precipitated S-based species determined by XPS. The study demonstrates that the SEI layer formed on the Li anode decreases in impedance and stabilizes by the presence of polysulfide. This, together with a buffer effect strongly mitigating the sulfur-cathode dissolution and the shuttle reaction, significantly improves the stability of the lithium−sulfur cell. The data here reported clearly suggest the polysulfide as an effective additive to enhance the performance of the lithium−sulfur battery.
Polysulfide-containing Glyme-based Electrolytes for Lithium Sulfur Battery
HASSOUN, Jusef
Ultimo
2015
Abstract
A new comparative investigation of lithium sulfur cells employing a tetraethylene glycol dimethyl ether−lithium trifluoromethanesulfonate (TEGDME-LiCF3SO3) electrolyte charged by various polysulfide species (Li2S2,Li2S4, Li2S6, and Li2S8) is here reported. We carefully detect the effects of lithium polysulfide addition by originally combining X-ray photoelectron spectroscopy (XPS) and electrochemical impedance spectroscopy (EIS). The measurements clearly reveal how the polysulfide addition affects the nature and composition of the solid electrolyte interphase (SEI) in terms of precipitated S-based species determined by XPS. The study demonstrates that the SEI layer formed on the Li anode decreases in impedance and stabilizes by the presence of polysulfide. This, together with a buffer effect strongly mitigating the sulfur-cathode dissolution and the shuttle reaction, significantly improves the stability of the lithium−sulfur cell. The data here reported clearly suggest the polysulfide as an effective additive to enhance the performance of the lithium−sulfur battery.File | Dimensione | Formato | |
---|---|---|---|
acs.chemmater.5b00896.pdf
solo gestori archivio
Descrizione: versione editoriale
Tipologia:
Full text (versione editoriale)
Licenza:
NON PUBBLICO - Accesso privato/ristretto
Dimensione
3.92 MB
Formato
Adobe PDF
|
3.92 MB | Adobe PDF | Visualizza/Apri Richiedi una copia |
11392-2335341_postprint_Hassoun_Jusef.pdf
accesso aperto
Descrizione: post print
Tipologia:
Post-print
Licenza:
PUBBLICO - Pubblico con Copyright
Dimensione
3.92 MB
Formato
Adobe PDF
|
3.92 MB | Adobe PDF | Visualizza/Apri |
I documenti in SFERA sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.