Raman Spectroscopic and X-ray Diffraction Studies of Sulfur Composite Electrodes during Discharge and Charge
- 1 January 2012
- journal article
- Published by The Electrochemical Society in Journal of the Electrochemical Society
- Vol. 159 (8), A1308-A1314
- https://doi.org/10.1149/2.080208jes
Abstract
The influence of solvents on the discharge behavior of lithium-sulfur cells was investigated by ex situ Raman spectroscopy and X-ray diffraction. Lithium polysulfide species formed in a sulfur cathode during cycling are characterized by Raman experiments for the first time and their structures are examined with regard to three different electrolytes at fully charged and discharged states. Moreover, ex-situ Raman studies give the evidence for the formation of lithium polysulfide on a Li metal anode by shuttle phenomena and the coexistence of soluble lithium polysulfide with elemental sulfur even after full charge. It was found that 1,3-dioxolane (DOX)/1M LiTFSI facilitates the migration of soluble lithium polysulfide toward a lithium anode and initiates a polysulfide shuttle causing a considerable capacity loss in lithium-sulfur cells. Raman results and cycling tests using an air-tight cell demonstrated that tetra(ethylene glycol) dimethyl ether (TEGDME)-based electrolytes hindered the significant overcharge and led to the formation of Li2S2 contributing to high discharge capacity through further electrochemical reduction to Li2S.Keywords
This publication has 28 references indexed in Scilit:
- In Operando X-ray Diffraction and Transmission X-ray Microscopy of Lithium Sulfur BatteriesJournal of the American Chemical Society, 2012
- Force Field Benchmark of Organic Liquids: Density, Enthalpy of Vaporization, Heat Capacities, Surface Tension, Isothermal Compressibility, Volumetric Expansion Coefficient, and Dielectric ConstantJournal of Chemical Theory and Computation, 2011
- High “C” rate Li-S cathodes: sulfur imbibed bimodal porous carbonsEnergy & Environmental Science, 2011
- Effects of carbon coating on the electrochemical properties of sulfur cathode for lithium/sulfur cellJournal of Power Sources, 2008
- A Mathematical Model for a Lithium–Sulfur CellJournal of the Electrochemical Society, 2008
- Binary electrolyte based on tetra(ethylene glycol) dimethyl ether and 1,3-dioxolane for lithium–sulfur batteryJournal of Power Sources, 2002
- The Lithium/Sulfur Rechargeable CellJournal of the Electrochemical Society, 2002
- Lithium Sulfur Battery: Oxidation/Reduction Mechanisms of Polysulfides in THF SolutionsJournal of the Electrochemical Society, 1988
- Sulfur solubility in pure and mixed organic solventsIndustrial & Engineering Chemistry Research, 1988
- A Lithium/Dissolved Sulfur Battery with an Organic ElectrolyteJournal of the Electrochemical Society, 1979