Rational design of double-confined Mn2O3/S@Al2O3 nanocube cathodes for lithium-sulfur batteries

Qiuhong Yu, Rongjie Luo, Xianlin Bai, Wenchao Yang, Yang Lu, Xiaoyi Hou, Tao Peng, Xianming Liu, Jang Kyo Kim, Yongsong Luo

Research output: Contribution to journalArticlepeer-review

20 Scopus citations

Abstract

Due to the high specific capacities and environmental benignity, lithium-sulfur (Li-S) batteries have shown fascinating potential to replace the currently dominant Li-ion batteries to power portable electronics and electric vehicles. However, the shuttling effect caused by the dissolution of polysulfides seriously degrades their electrochemical performance. In this paper, Mn2O3 microcubes are fabricated to serve as the sulfur host, on top of which Al2O3 layers of 2 nm in thickness are deposited via atomic layer deposition (ALD) to form Mn2O3/S (MOS) @Al2O3 composite electrodes. The MOS@Al2O3 electrode delivers an excellent initial capacity of 1012.1 mAh g−1 and a capacity retention of 78.6% after 200 cycles at 0.5 C, and its coulombic efficiency reaches nearly 99%, giving rise to much better performance than the neat MOS electrode. These findings demonstrate the double confinement effect of the composite electrode in that both the porous Mn2O3 structure and the atomic Al2O3 layer serve as the spacious host and the protection layer of sulfur active materials, respectively, for significantly improved electrochemical performance of the Li-S battery.

Original languageBritish English
Pages (from-to)849-858
Number of pages10
JournalJournal of Solid State Electrochemistry
Volume22
Issue number3
DOIs
StatePublished - 1 Mar 2018

Keywords

  • AlO layer
  • ALD
  • Double confinement
  • Li-S batteries
  • Polysulfides

Fingerprint

Dive into the research topics of 'Rational design of double-confined Mn2O3/S@Al2O3 nanocube cathodes for lithium-sulfur batteries'. Together they form a unique fingerprint.

Cite this