Energy Storage Science and Technology ›› 2022, Vol. 11 ›› Issue (9): 2811-2824.doi: 10.19799/j.cnki.2095-4239.2022.0371

• Special Issue for the 10th Anniversary • Previous Articles     Next Articles

The recent progress and future opportunities of Na2S cathode for room temperature sodium sulfur batteries

Binwei ZHANG1,2(), Zidong WEI1,2(), Shigang SUN2,3()   

  1. 1.School of Chemistry and Chemical Engineering, Chongqing University
    2.Center of Advanced Energy Technology and Electrochemistry, Institute of Advanced Interdisciplinary Studies, Chongqing University, Chongqing 400044, China
    3.State Key Laboratory of Physical Chemistry of Solid Surfaces, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, Fujian, China
  • Received:2022-07-01 Revised:2022-07-15 Online:2022-09-05 Published:2022-08-30
  • Contact: Zidong WEI, Shigang SUN E-mail:binwei@cqu.edu.cn;zdwei@cqu.edu.cn;sgsun@xmu.edu.cn

Abstract:

Room temperature sodium sulfur batteries are regarded as the next generation of large-scale energy storage systems because of its high energy density and the abundant resources of sodium and sulfur. Na2S is a promising cathode material that possesses a high theoretical capacity (686 mAh/g), and is able to be coupled with non-sodium metal anode (e.g., hard carbon or Sn), which can get rid of the safety issues related to sodium metal. However, the electronically insulating nature and the poor reactivity of Na2S, and its low kinetics conversion to polysulfides result in a large first-charge overpotential and poor cycle life, limiting their practical application. Herein, the fundamental knowledge and principle of storage sodium of Na2S is detailed discussed. Additionally, recent reports on enhanced electrochemical performance strategies are comprehensively reviewed in detail with an emphasis on carbon-based Na2S composite materials, Na2S morphological structure design, Na2S electrocatalytic mechanism, and device design. Finally, the perspectives are proposed on the future opportunities for Na2S cathode material that are obstructing more practical Na2S cathode based batteries.

Key words: room temperature sodium sulfur batteries, Na2S cathode, conductivity, shuttle effect, long cycle life

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