Dendrite-free alkali metal electrodeposition from contact-ion-pair state induced by mixing alkaline earth cation

Hongyi Li, Masaki Murayama, Tetsu Ichitsubo

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)


Alkali metals are expected to be used for rechargeable metal anode batteries owing to their low electrode potentials and large capacities. However, they face the well-known fatal problem of “dendritic growth” while charging. Here, we present a detailed investigation on electrolytes where alkaline earth salts are introduced to inhibit dendrite growth in alkali metal electrodeposition. Specifically, focusing on CaTFSA2 as an exemplary additive, we reveal that dendrite-free morphology upon alkali metal electrodeposition can be attained by modifying the solvation structures in dual-cation electrolytes. Addition of Ca2+ promotes alkali cation (Li+ or Na+) to form the contact ion pairs (CIPs) with the counter anions, which replaces the solvent-separated ion pairs that commonly exist in single-cation electrolytes. The strong binding of the CIPs slows the desolvation kinetics of alkali cations and, consequently, realizes a severely constrained alkali metal electrodeposition in a reaction-limited process that is required for the dendrite-free morphology.

Original languageEnglish
Article number100907
JournalCell Reports Physical Science
Issue number6
Publication statusPublished - 2022 Jun 15


  • alkali metal anode
  • cation additive
  • concerted interaction
  • dual-cation electrolyte
  • electrodeposition morphology
  • solvation structure modification

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Engineering(all)
  • Energy(all)
  • Physics and Astronomy(all)


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