Unlocking High Capacity and Fast Na+ Diffusion of HxCrS2 by Proton-Exchange Pretreatment

Joseph W. Stiles, Anna L. Soltys, Xiaoyu Song, Saul H. Lapidus, Craig B. Arnold, Leslie M. Schoop

Research output: Contribution to journalArticlepeer-review

5 Scopus citations

Abstract

This study presents a new material, “HxCrS2” (denotes approximate composition) formed by proton-exchange of NaCrS2 which has a measured capacity of 728 mAh g−1 with significant improvements to capacity retention, sustaining over 700 mAh g−1 during cycling experiments. This is the highest reported capacity for a transition metal sulfide electrode and outperforms the most promising proposed sodium anodes to date. HxCrS2 exhibits a biphasic structure featuring alternating crystalline and amorphous lamella on the scale of a few nanometers. This unique structural motif enables reversible access to Cr redox in the material resulting in higher capacities than seen in the parent structure which features only S redox. Pretreatment by proton-exchange offers a route to materials such as HxCrS2 which provide fast diffusion and high capacities for sodium-ion batteries.

Original languageEnglish (US)
Article number2209811
JournalAdvanced Materials
Volume35
Issue number10
DOIs
StatePublished - Mar 9 2023

All Science Journal Classification (ASJC) codes

  • Mechanics of Materials
  • Mechanical Engineering
  • General Materials Science

Keywords

  • batteries
  • electrodes
  • pretreatment
  • proton exchange

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