Multifunctional LDH/Co9S8 heterostructure nanocages as high-performance lithium–sulfur battery cathodes with ultralong lifespan

Shixia Chen, Junhui Luo, Nuoyan Li, Xinxin Han, Jun Wang, Qiang Deng, Zheling Zeng, Shuguang Deng

Research output: Contribution to journalArticlepeer-review

16 Scopus citations

Abstract

Layered double hydroxides (LDHs) are promising lithium polysulfides (LiPSs) mediators, but the implementation of LDHs-based cathodes as high-performance lithium-sulfur batteries (LSBs) is hindered by their poor electrical conductivity and limited active sites. Herein, we report a hollow NiCo-LDH/Co9S8 (H-LDH/Co9S8) heterostructure with ordered nanocage morphology by in situ transformations of ZIF-67. The H-LDH/Co9S8 heterostructure could physically inhibit the LiPSs diffusion and accommodate sufficient sulfur. The abundant exposed O- and Co-adsorption sites could firmly entrap LiPSs and electrocatalytically boosted their conversion kinetics. Moreover, the intimated interfaces of NiCo-LDH and Co9S8 domains endow a significantly improved electron conductivity and Li+ ion diffusivity. As a result, H-LDH/Co9S8 delivers a high discharge capacity of 1339.1 ​mAh g−1 at the current density of 0.1C and shows an ultrastable lifespan over 1500 cycles with a small capacity decay of 0.047% per cycle and stable coulombic efficiency above 98% at the current density of 1.0C. This work paves a new way to fabricate and utilize LDH materials as high-performance LSB cathodes and provides new insights into the multifunctional heterostructure as ultralong life span electrodes.

Original languageEnglish (US)
Pages (from-to)187-195
Number of pages9
JournalEnergy Storage Materials
Volume30
DOIs
StatePublished - Sep 2020

Keywords

  • Enhanced conductivity
  • Heterostructure
  • Hollow nanocage
  • Layered double hydroxides (LDHs)
  • Li–S battery
  • Ultralong lifespan

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Materials Science(all)
  • Energy Engineering and Power Technology

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