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Title: Hybrid electrolyte design for high-performance zinc–sulfur battery
Authors: Guo, Yuqi
Chua, Rodney
Chen, Yingqian
Cai, Yi
Tang, Ernest Jun Jie
Lim, Nicholas J. J.
Tran, Thu Ha
Verma, Vivek
Wong, Ming Wah
Srinivasan, Madhavi
Keywords: Engineering::Materials
Issue Date: 2023
Source: Guo, Y., Chua, R., Chen, Y., Cai, Y., Tang, E. J. J., Lim, N. J. J., Tran, T. H., Verma, V., Wong, M. W. & Srinivasan, M. (2023). Hybrid electrolyte design for high-performance zinc–sulfur battery. Small, e2207133-.
Project: NRFI2017-08/NRF2016NRF-NRFI001-22 
Journal: Small 
Abstract: Rechargeable aqueous Zn/S batteries exhibit high capacity and energy density. However, the long-term battery performance is bottlenecked by the sulfur side reactions and serious Zn anode dendritic growth in the aqueous electrolyte medium. This work addresses the problem of sulfur side reactions and zinc dendrite growth simultaneously by developing a unique hybrid aqueous electrolyte using ethylene glycol as a co-solvent. The designed hybrid electrolyte enables the fabricated Zn/S battery to deliver an unprecedented capacity of 1435 mAh g-1 and an excellent energy density of 730 Wh kg-1 at 0.1 Ag-1 . In addition, the battery exhibits capacity retention of 70% after 250 cycles even at 3 Ag-1 . Moreover, the cathode charge-discharge mechanism studies demonstrate a multi-step conversion reaction. During discharge, the elemental sulfur is sequentially reduced by Zn to S2- ( S8→Sx2-→S22-+S2-)${{\rm{S}}_8}{\bm{ \to }}{\rm{S}}_{\rm{x}}^{2{\bm{ - }}}{\bm{ \to }}{\rm{S}}_2^{2{\bm{ - }}}{\bm{ + }}{{\rm{S}}^{2{\bm{ - }}}})$ , forming ZnS. On charging, the ZnS and short-chain polysulfides will oxidize back to elemental sulfur. This electrolyte design strategy and unique multi-step electrochemistry of the Zn/S system provide a new pathway in tackling both key issues of Zn dendritic growth and sulfur side reactions, and also in designing better Zn/S batteries in the future.
ISSN: 1613-6810
DOI: 10.1002/smll.202207133
Schools: School of Materials Science and Engineering 
Research Centres: Energy Research Institute @ NTU (ERI@N) 
Rights: © 2023 Wiley-VCH GmbH. All rights reserved.
Fulltext Permission: none
Fulltext Availability: No Fulltext
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