Investigation of the Self-Discharge Behavior of Lithium-Sulfur Batteries

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Abstract

Lithium-Sulfur (Li-S) batteries represent a perspective energy storage technology, which reaches very high theoretical limits in terms of specific capacity, specific energy, and energy density. However, Li-S batteries are governed by the polysulfide shuttle mechanism, which causes fast capacity fade, low coulombic efficiency, and high self-discharge rate. The self-discharge is an important characteristic of Li-S batteries for both practical applications and laboratory testing, which is highly dependent on the operating conditions. Thus, to map and to understand the Li-S self-discharge behavior under various conditions, such as depth-of-discharge, temperature, and idling time, a set of experiments were performed in this work on 3.4 Ah Li-S pouch cells. The results are systematically presented in form of open-circuit voltages during idling and self-discharge separated into reversible and irreversible capacity loss. Furthermore, estimation of the actual high voltage plateau capacity based on a self-discharge constant was performed according to an earlier proposed methodology; however, the method needs further improvements in order to estimate this capacity accurately for all conditions.
Original languageEnglish
JournalJournal of The Electrochemical Society
Volume163
Issue number6
Pages (from-to)A911-A916
Number of pages6
ISSN0013-4651
DOIs
Publication statusPublished - Mar 2016

Keywords

  • Experimental investigation
  • Lithium-Sulfur battery
  • Self-discharge

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