Electrochemical behavior and morphological evolution of Li metal anode under high cycling capacity

Jae Hwan Hyun, Min Jeong Yi, Hyejin Jung, Si Hwan Lee, Ji Hyun Um, Seung Ho Yu

Research output: Contribution to journalArticlepeer-review

Abstract

Despite the high theoretical capacity and low reduction potential of Li metal, low Coulombic efficiency and safety issues of Li metal batteries have hindered their commercialization. In this work, we explore the processes significantly impacting on Coulombic efficiency and overpotential in Li||Cu asymmetric cells depending on “cycling capacity”. To understand this behavior, we focused on three overshooting peaks in voltage profiles, and as each peak involves both Li plating and stripping at two electrodes, we could extract the six individual processes. Among them, the decreasing values of overpotential with increasing cycling capacity (or equivalently, “cycling time” at a fixed current density) are clearly observed, confirming their influence on cell performance. This comprehensive understanding of Coulombic efficiency, overpotential and morphological evolutions from the perspective of time provides new insight to the performance of Li metal batteries.

Original languageEnglish
Pages (from-to)146-155
Number of pages10
JournalEnergy Storage Materials
Volume54
DOIs
Publication statusPublished - 2023 Jan

Keywords

  • Coulombic efficiency
  • Lithium metal batteries
  • Operando optical microscopy
  • Overpotential

ASJC Scopus subject areas

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

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