Understanding and Engineering Interfacial Adhesion in Solid-State Batteries with Metallic Anodes

Ieuan D. Seymour* (Corresponding Author), Edouard Quérel, Rowena H. Brugge, Federico M. Pesci, Ainara Aguadero* (Corresponding Author)

*Corresponding author for this work

Research output: Contribution to journalReview articlepeer-review

5 Citations (Scopus)

Abstract

High performance alkali metal anode solid-state batteries require solid/solid interfaces with fast ion transfer that are morphologically and chemically stable upon electrochemical cycling. Void formation at the alkali metal/solid-state electrolyte interface during alkali metal stripping is responsible for constriction resistances and hotspots that can facilitate dendrite propagation and failure. Both externally applied pressures (35–400 MPa) and temperatures above the melting point of the alkali metal have been shown to improve the interfacial contact with the solid electrolyte, preventing the formation of voids. However, the extreme pressure and temperature conditions required can be difficult to meet for commercial solid-state battery applications. In this review, we highlight the importance of interfacial adhesion or ‘wetting’ at alkali metal/solid electrolyte interfaces for achieving solid-state batteries that can withstand high current densities without cell failure. The intrinsically poor adhesion at metal/ceramic interfaces poses fundamental limitations on many inorganics solid-state electrolyte systems in the absence of applied pressure. Suppression of alkali metal voids can only be achieved for systems with high interfacial adhesion (i. e. ‘perfect wetting’) where the contact angle between the alkali metal and the solid-state electrolyte surface goes to θ=0°. We identify key strategies to improve interfacial adhesion and suppress void formation including the adoption of interlayers, alloy anodes and 3D scaffolds. Computational modeling techniques have been invaluable for understanding the structure, stability and adhesion of solid-state battery interfaces and we provide an overview of key techniques. Although focused on alkali metal solid-state batteries, the fundamental understanding of interfacial adhesion discussed in this review has broader applications across the field of chemistry and material science from corrosion to biomaterials development.

Original languageEnglish
Article numbere202202215
Number of pages41
JournalChemSusChem
Volume16
Issue number12
Early online date19 Apr 2023
DOIs
Publication statusPublished - 22 Jun 2023

Bibliographical note

Funding Information:
The authors acknowledge funding for this work from the Engineering and Physical Sciences Research Council (EP/R002010/1, EP/R024006/1 and EP/P003532/1), Shell Global Solutions International B.V., the Spanish government (TED2021‐129254B‐C22) and Horizon Europe HORIZON‐CL5‐2021‐D2‐01 “SEATBELT” 101069726.

Keywords

  • alkali metals
  • electrode materials
  • first-principles calculations
  • interfaces
  • solid-state batteries

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