Journal
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
Volume 160, Issue 11, Pages A2288-A2292Publisher
ELECTROCHEMICAL SOC INC
DOI: 10.1149/2.106311jes
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Funding
- Battelle [DE-AC05-76RL01830]
- Department of Energy's Office of Biological and Environmental Research
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The basic requirements for getting reproducible Li-S battery data have been discussed in this work. Unlike Li-ion batteries, electrolyte-rich environment significantly deteriorates the cycling stability of Li-S batteries assembled and tested under the same conditions. The reason has been assigned to the low concentration of polysulfide-containing electrolyte in the cells, which shows profound influences on both sulfur cathode and lithium metal anode. With optimized sulfur/electrolyte (SIB) ratio of 50 g L-1, a good balance between electrolyte viscosity, wetting ability, diffusion rate of dissolved polysulfide and nucleation/growth of short-chain Li2S/Li2S2 has been established along with largely reduced corrosion Of the lithium metal anode. Accordingly, good cyclability, high reversible capacity and Coulombic efficiency are achieved in Li-S cell with optimized SIB ratio without any additive. Other factors such as sulfur content in the composite and sulfur loading in the whole electrode also need careful concern in Li-S battery system in order to generate reproducible results and gauge the various methods used to improve Li-S battery technology. (C) 2013 The Electrochemical Society. All rights reserved.
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