Anion-Doped Cobalt Selenide with Porous Architecture for High-Rate and Flexible Lithium–Sulfur Batteries

Tao Feng, Teng Zhao*, Shuangfei Zhu, Nanxiang Zhang, Zhuangzhuang Wei, Ke Wang, Li Li, Feng Wu, Renjie Chen*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

37 Citations (Scopus)

Abstract

Emerging catalytic host for sulfur is an effective approach to breaking the limits of lithium–sulfur batteries for practical applications. Herein, the hydrangea-shaped Co0.85Se electrocatalyst with macroporous architecture is synthesized. Besides, to improve the electronic conductivity of Co0.85Se, some defects (S-doped) are introduced into the structure of crystals. The S-doped Co0.85Se exhibited an outstanding electrocatalytic effect on lithium polysulfides conversion and can induce and regulate uniform growth of insoluble Li2S on its surface due to the synergistic adsorption by Se and S. As a result, the S/C cathode achieved a high initial capacity of 1340.6 mAh g−1 at 0.5 C and a stable cycling capacity of 666.6 mAh g−1 at 1 C after 500 cycles by 5 wt% Co0.85SeS additions. Moreover, high S loading cathodes are designed through in situ synthesis of Co0.85SeS on flexible carbon cloth (Co0.85SeS@CC). The porous and open framework of Co0.85SeS@CC facilitated electrolyte infiltration and accommodated the volume change of sulfur during the charge/discharge process. Taking by these advantages, a high areal capacity of 9.663 mAh cm−2 is achieved at a high sulfur loading of 9.98 mg cm−2. Even at a high current density of 15 mA cm−2, a reversible capacity of 603.7 mAh g−1 is maintained at a sulfur loading of 6.52 mg cm−2. This proposed work provides a feasible approach to high-rate and flexible Li–S batteries.

Original languageEnglish
Article number2100649
JournalSmall Methods
Volume5
Issue number9
DOIs
Publication statusPublished - 15 Sept 2021

Keywords

  • Co SeS
  • electrocatalyst
  • flexible pouch batteries
  • lithium–sulfur
  • porous architecture

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Feng, T., Zhao, T., Zhu, S., Zhang, N., Wei, Z., Wang, K., Li, L., Wu, F., & Chen, R. (2021). Anion-Doped Cobalt Selenide with Porous Architecture for High-Rate and Flexible Lithium–Sulfur Batteries. Small Methods, 5(9), Article 2100649. https://doi.org/10.1002/smtd.202100649