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Title: High-performance room-temperature sodium–sulfur battery enabled by electrocatalytic sodium polysulfides full conversion

Journal Article · · Energy & Environmental Science
DOI: https://doi.org/10.1039/c9ee03251g · OSTI ID:1803498
 [1];  [2];  [3];  [3];  [3];  [2];  [2];  [2]; ORCiD logo [2]; ORCiD logo [2]; ORCiD logo [3]
  1. Univ. of Wollongong, NSW (Australia). Inst. for Superconducting and Electronic Materials; Univ. of Texas, Austin, TX (United States). Materials Science and Engineering Program. Dept. of Mechanical Engineering; OSTI
  2. Univ. of Wollongong, NSW (Australia). Inst. for Superconducting and Electronic Materials
  3. Univ. of Texas, Austin, TX (United States). Materials Science and Engineering Program. Dept. of Mechanical Engineering
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Room-temperature sodium–sulfur (RT-Na–S) batteries are highly desirable for grid-scale stationary energy storage due to their low cost; however, short cycling stability caused by the incomplete conversion of sodium polysulfides is a major issue for their application. Herein, we introduce an effective sulfiphilic host, gold nanodots decorated on hierarchical N-doped carbon microspheres (CN/Au/S), to achieve completely reversible conversion reactions in the S cathode by electrocatalyzing the low-kinetics conversion of Na2S4 into NaS2 (discharge process) or S (charge process). Besides, gold nanodots and N-doped carbon can increase the conductivity of the S cathode and provide strong polar–polar adsorption of sodium polysulfides to alleviate the shuttling effects. When serving as the cathode, the CN/Au/S composite can realize enhanced sulfur utilization, excellent cycling stability, and outstanding rate capability. This work deepens our understanding of the catalytic effect of gold atoms on sulfur molecules, opening a new avenue for cathode design and development of advanced RT-Na–S batteries.

Research Organization:
Univ. of Texas, Austin, TX (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC0019019
OSTI ID:
1803498
Journal Information:
Energy & Environmental Science, Journal Name: Energy & Environmental Science Journal Issue: 2 Vol. 13; ISSN 1754-5692
Publisher:
Royal Society of ChemistryCopyright Statement
Country of Publication:
United States
Language:
English

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