Jump to main content
Jump to site search

Issue 35, 2018
Previous Article Next Article

Electrocatalysis of polysulfide conversion by conductive RuO2 nano dots for lithium–sulfur batteries

Author affiliations

Abstract

The practical use of the rechargeable lithium–sulfur (Li–S) battery is still restricted by poor cycle life and rate performance caused by the shuttle of soluble redox intermediates and low conductivity of S/Li2S. A comprehensive approach is to tune the multi-electron redox reactions and construct reversible chemical bonds with polysulfide intermediates. In this study, RuO2 nano dots (NDs) are proposed to anchor polysulfides, trigger the surface-mediated reduction of polysulfides and to facilitate the formation of Li2S2/Li2S through its catalytic effect for the first time. When serving as the sulfur host, the RuO2 NDs can retard the shuttle of polysulfides, accelerate the redox reaction of polysulfides, and therefore result in improved sulfur utilization and enhanced rate performance. The designed RuO2@NMCs/S ternary electrodes with high sulfur loading of 70 wt% could achieve a low decay rate of 0.07% per cycle for 500 cycles at a 0.5 C-rate. Realized by fast electrode kinetics, the reversible capacity of 634 mA h g−1 is attained at a high C-rate of 5 C. Overall, this strategy sheds new light on the oxide mediators for reversible modulation of electrochemical reactions in lithium–sulfur (Li–S) batteries.

Graphical abstract: Electrocatalysis of polysulfide conversion by conductive RuO2 nano dots for lithium–sulfur batteries

Back to tab navigation

Supplementary files

Publication details

The article was received on 23 May 2018, accepted on 05 Aug 2018 and first published on 06 Aug 2018


Article type: Paper
DOI: 10.1039/C8NR04182B
Citation: Nanoscale, 2018,10, 16730-16737
  •   Request permissions

    Electrocatalysis of polysulfide conversion by conductive RuO2 nano dots for lithium–sulfur batteries

    R. Wang, K. Wang, S. Gao, M. Jiang, J. Han, M. Zhou, S. Cheng and K. Jiang, Nanoscale, 2018, 10, 16730
    DOI: 10.1039/C8NR04182B

Search articles by author

Spotlight

Advertisements