Frontiers in Chemistry (Apr 2020)

β-FeOOH Interlayer With Abundant Oxygen Vacancy Toward Boosting Catalytic Effect for Lithium Sulfur Batteries

  • Yingying Li,
  • Xifei Li,
  • Xifei Li,
  • Xifei Li,
  • Youchen Hao,
  • Alibek Kakimov,
  • Dejun Li,
  • Qian Sun,
  • Liang Kou,
  • Zhanyuan Tian,
  • Le Shao,
  • Cheng Zhang,
  • Jiujun Zhang,
  • Jiujun Zhang,
  • Xueliang Sun,
  • Xueliang Sun,
  • Xueliang Sun

DOI
https://doi.org/10.3389/fchem.2020.00309
Journal volume & issue
Vol. 8

Abstract

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Due to the shuttle effect and low conductivity of sulfur (S), it has been challenging to realize the application of lithium-sulfur (Li-S) batteries with high performance and long cyclability. In this study, a high catalytic active CNTs@FeOOH composite is introduced as a functional interlayer for Li-S batteries. Interestingly, the existence of oxygen vacancy in FeOOH functions electrocatalyst and promotes the catalytic conversion of intercepted lithium polysulfides (LiPS). As a result, the optimized CNTs@FeOOH interlayer contributed to a high reversible capacity of 556 mAh g−1 at 3,200 mA g−1 over 350 cycles. This study demonstrates that enhanced catalytic effect can accelerate conversion efficiency of polysulfides, which is beneficial of boosting high performance Li-S batteries.

Keywords