Ultrathin Lithium Aluminate Nanoflake-Inlaid Sulfur as a Cathode Material for Lithium-Sulfur Batteries with High Areal Capacity

Arnab Ghosh, Ajit Kumar, Amlan Roy, Cuong Nguyen, Aakash Ahuja, Md Adil, Manjunath Chatti, Mega Kar, Douglas R. MacFarlane, Sagar Mitra

Research output: Contribution to journalArticleResearchpeer-review

Abstract

Direct Utilization of commercial sulfur as a cathode material is ideal for the bulk production of high-energy-density lithium-sulfur (Li-S) batteries. However, due to large ion-diffusion length, commercial sulfur suffers from low practical capacity. To achieve adequate capacity with long-term cyclability using the commercial sulfur-based cathodes, we introduce ultrathin lithium aluminate (LiAlO2) nanoflakes as polysulfide immobilizers with excellent Li+ ion conductivity. The ultrathin LiAlO2 nanoflake-inlaid sulfur cathode exhibits high areal capacity with extremely stable cycling performance. At a current rate of 0.2C, our cathode delivered a high areal capacity of 4.86 mA h cm-2 during the first cycle and retains 4.75 mA h cm-2 after 100 cycles. At a high current rate of 3C, the cathode retains the areal capacity of 2.52 mA h cm-2 after 500 cycles, with an extremely low capacity decay rate of 0.02% per cycle. In situ Raman spectroscopy studies coupled with the chronoamperometry technique reveal that LiAlO2 nanoflakes catalyze the redox kinetics in the Li-S batteries. This work shows a promising strategy to directly utilize commercial sulfur powder in practical Li-S batteries.

Original languageEnglish
Pages (from-to)5637-5645
Number of pages9
JournalACS Applied Energy Materials
Volume3
Issue number6
DOIs
Publication statusPublished - 22 Jun 2020

Keywords

  • electrocatalysts
  • in situ Raman spectroscopy
  • lithium aluminate
  • lithium-sulfur batteries
  • polysulfide immobilizers

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