Achieving high capacity retention for SnS2 anodes via the solvent-driven reversible conversion-alloying reactions

Yong Seok Choi, Hyun Min Lee, Joo Yeon Moon, David O. Scanlon, Jae Chul Lee

Research output: Contribution to journalArticlepeer-review

Abstract

Despite their large theoretical capacity (typically > 1000 mAh g−1), anode materials featuring Na storage via a combined mechanism of conversion and alloying reactions are practically limited in Na-ion batteries owing to their poor initial Coulombic efficiency (typically ∼50%). Using SnS2 as an example, we present a model that elucidates the physics underpinning its inferior Coulombic efficiency by incorporating an understanding of the thermodynamics and kinetics of conversion-alloying reactions. The developed model show that conversion-alloying reactions and their reversibility can be engineered by modulating the solvation tendency of electrolyte solvents, resulting in an enhanced initial Coulombic efficiency of > 70% (corresponding to 817 mAh g−1) even without expensive pretreatment and the use of nanoscale SnS2 particle anodes. Thus, this study that correlates the solvent properties and first-cycle reversibility offers a solution for selecting appropriate electrolytes for designing high-energy-density anodes based on various sodium storage mechanisms.

Original languageEnglish
Article number102867
JournalEnergy Storage Materials
Volume61
DOIs
Publication statusPublished - 2023 Aug

Bibliographical note

Publisher Copyright:
© 2023

Keywords

  • Ab initio calculations
  • Battery
  • Electrochemistry
  • Phase diagrams
  • Phase transitions
  • Solvent effects

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • General Materials Science
  • Energy Engineering and Power Technology

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