articleAnalytical ChemistryApr 9, 2012Closed access

Lithium/Sulfur Cell Discharge Mechanism: An Original Approach for Intermediate Species Identification

Laboratoire d’Innovation pour les Technologies des Énergies Nouvelles et les nanomatériaux · Laboratoire d’Electrochimie et de Physico-chimie des Matériaux et des Interfaces · +5 more institutions

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Abstract

The lithium/sulfur battery is a promising electrochemical system that has a high theoretical capacity of 1675 mAh g(-1), but its discharge mechanism is well-known to be a complex multistep process. As the active material dissolves during cycling, this discharge mechanism was investigated through the electrolyte characterization. Using high-performance liquid chromatography, UV-visible absorption, and electron spin resonance spectroscopies, we investigated the electrolyte composition at different discharge potentials in a TEGDME-based electrolyte. In this study, we propose a possible mechanism for sulfur reduction consisting of three steps. Long polysulfide chains are produced during the first reduction step…

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