We report an electrolyte with low flammability, based on diethylene glycol dimethyl ether (DEGDME) dissolving lithium bis-trifluoromethane sulfonimidate (LiTFSI), and lithium nitrate (LiNO3) for high-performances lithium/sulfur battery. Self-diffusion coefficients, conductivity, and lithium transport number of the electrolyte are obtained by nuclear magnetic resonance and electrochemical impedance spectroscopy. Interface stability, lithium stripping/deposition ability, and the electrochemical stability window of the electrolyte are determined by voltammetry and impedance spectroscopy. The tests suggest conductivity higher than 10−2 S cm−1, lithium transport number of about 0.5, electrochemical stability extending from 0 V to 4.6 V, and excellent compatibility with lithium metal. A composite cathode using sulfur and multi walled carbon nanotubes (MWCNTs) is characterized in terms of structure and morphology by X-ray diffraction and scanning electron microscopy. The study shows spherical flakes in which the carbon nanotubes protect the crystalline sulfur from excessive dissolution, and create the optimal host for allowing the proper cell operation. The Li/S cell reveals highly reversible process during charge/discharge cycles, fast kinetic, and lithium diffusion coefficient in the sulfur electrode ranging from 10−12 to 10−10 cm2 s−1. The cell evidences a coulombic efficiency approaching 100%, capacity from 1300 mAh g−1 to 900 mAh g−1 and practical energy density higher than 400 Wh kg−1.

A simple approach for making a viable, safe, and high-performances lithium-sulfur battery

Coneglian, Thomas;Hassoun, Jusef
2018

Abstract

We report an electrolyte with low flammability, based on diethylene glycol dimethyl ether (DEGDME) dissolving lithium bis-trifluoromethane sulfonimidate (LiTFSI), and lithium nitrate (LiNO3) for high-performances lithium/sulfur battery. Self-diffusion coefficients, conductivity, and lithium transport number of the electrolyte are obtained by nuclear magnetic resonance and electrochemical impedance spectroscopy. Interface stability, lithium stripping/deposition ability, and the electrochemical stability window of the electrolyte are determined by voltammetry and impedance spectroscopy. The tests suggest conductivity higher than 10−2 S cm−1, lithium transport number of about 0.5, electrochemical stability extending from 0 V to 4.6 V, and excellent compatibility with lithium metal. A composite cathode using sulfur and multi walled carbon nanotubes (MWCNTs) is characterized in terms of structure and morphology by X-ray diffraction and scanning electron microscopy. The study shows spherical flakes in which the carbon nanotubes protect the crystalline sulfur from excessive dissolution, and create the optimal host for allowing the proper cell operation. The Li/S cell reveals highly reversible process during charge/discharge cycles, fast kinetic, and lithium diffusion coefficient in the sulfur electrode ranging from 10−12 to 10−10 cm2 s−1. The cell evidences a coulombic efficiency approaching 100%, capacity from 1300 mAh g−1 to 900 mAh g−1 and practical energy density higher than 400 Wh kg−1.
Carbone, Lorenzo; Coneglian, Thomas; Gobet, Mallory; Munoz, Stephen; Devany, Matthew; Greenbaum, Steve; Hassoun, Jusef
File in questo prodotto:
File Dimensione Formato  
1-s2.0-S0378775317315628-main.pdf

solo gestori archivio

Descrizione: versione editoriale
Tipologia: Full text (versione editoriale)
Licenza: NON PUBBLICO - Accesso privato/ristretto
Dimensione 1.59 MB
Formato Adobe PDF
1.59 MB Adobe PDF   Visualizza/Apri   Richiedi una copia
Manuscript.Lorenzo_Carbone_diethylene_glycol_dimethyl_2017.pdf

accesso aperto

Descrizione: versione preprint
Tipologia: Pre-print
Licenza: Creative commons
Dimensione 1.75 MB
Formato Adobe PDF
1.75 MB Adobe PDF Visualizza/Apri

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11392/2383117
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 50
  • ???jsp.display-item.citation.isi??? 49
social impact