Journal
JOURNAL OF POWER SOURCES
Volume 348, Issue -, Pages 175-182Publisher
ELSEVIER
DOI: 10.1016/j.jpowsour.2017.03.008
Keywords
Lithium sulfur batteries; Electrolyte additive; Pyrrole; Polysulfides trapping
Funding
- National Natural Science Foundation of China [51674221]
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Lithium sulfur batteries are a promising energy storage devices beyond conventional lithium ion batteries. However, the shuttle effect of soluble polysulfides is a major barrier between electrodes, resulting in rapid capacity fading. To address above issue, pyrrole has been investigated as an electrolyte additive to trap polysulfides. When pyrrole is added into electrolyte, a surface protective layer of polypyrrole can be formed on the sulfur cathode, which not only acts as a conductive agent to provide an effective electron conduction path but also acts as an absorbing agent and barrier layer suppressing the diffusion of polysulfide intermediates. The results demonstrate that an appropriate amount of pyrrole added into the electrolyte leads to excellent cycling stability and rate capability. Apparently, pyrrole is an effective additive for the entrapment of polysulfides of lithium-sulfur batteries. (C) 2017 Elsevier B.V. All rights reserved.
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