Quantitative investigation of polysulfide adsorption capability of candidate materials for Li-S batteries

David Sichen Wu, Feifei Shi, Guangmin Zhou, Chenxi Zu, Chong Liu, Kai Liu, Yayuan Liu, Jiangyan Wang, Yucan Peng, Yi Cui

Research output: Contribution to journalArticlepeer-review

58 Scopus citations

Abstract

Lithium-sulfur batteries have a high theoretical energy density of 2500 Wh/kg and are promising candidates for meeting future energy storage demands. However, dissolution of the intermediate polysulfide species into the electrolyte remains as a major challenge, causing fast capacity degradation in Li-S batteries. Many recent studies have reported various materials such as metal oxides and sulfides that interact strongly with polysulfide species and can alleviate the dissolution problem, though little work has focused on quantitative comparison of different materials under equivalent conditions. Here, we establish a standard procedure to quantitatively compare the polysulfide adsorption capability of candidate materials. We found that an order of magnitude of difference is evident between poor adsorption materials such as carbon black and strong adsorption materials such as V2O5 and MnO2. We elucidate different adsorption mechanisms may be present and probe possible adsorption species. We expect our work will provide a useful strategy to screen for suitable candidate materials and valuable information for rational design of long cycle life Li-S batteries.

Original languageEnglish (US)
Pages (from-to)241-246
Number of pages6
JournalEnergy Storage Materials
Volume13
DOIs
StatePublished - Jul 2018

All Science Journal Classification (ASJC) codes

  • Renewable Energy, Sustainability and the Environment
  • Materials Science(all)
  • Energy Engineering and Power Technology

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