Interfaces between Ceramic and Polymer Electrolytes: A Comparison of Oxide and Sulfide Solid Electrolytes for Hybrid Solid-State Batteries

  • Dominic Spencer jolly
  • , Dominic L. R. Melvin
  • , Isabella D. R. Stephens
  • , Rowena H. Brugge
  • , Shengda D. Pu
  • , Junfu Bu
  • , Ziyang Ning
  • , Gareth O. Hartley
  • , Paul Adamson
  • , Patrick S. Grant
  • , Ainara Aguadero
  • , Peter G. Bruce*
  • *Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

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Abstract

Hybrid solid-state batteries using a bilayer of ceramic and solid polymer electrolytes may offer advantages over using a single type of solid electrolyte alone. However, the impedance to Li+ transport across interfaces between different electrolytes can be high. It is important to determine the resistance to Li+ transport across these heteroionic interfaces, as well as to understand the underlying causes of these resistances; in particular, whether chemical interphase formation contributes to giving high resistances, as in the case of ceramic/liquid electrolyte interfaces. In this work, two ceramic electrolytes, Li3PS4 (LPS) and Li6.5La3Zr1.5Ta0.5O12 (LLZTO), were interfaced with the solid polymer electrolyte PEO10:LiTFSI and the interfacial resistances were determined by impedance spectroscopy. The LLZTO/polymer interfacial resistance was found to be prohibitively high but, in contrast, a low resistance was observed at the LPS/polymer interface that became negligible at a moderately elevated temperature of 50 °C. Chemical characterization of the two interfaces was carried out, using depth-profiled X-ray photoelectron spectroscopy and time-of-flight secondary ion mass spectrometry, to determine whether the interfacial resistance was correlated with the formation of an interphase. Interestingly, no interphase was observed at the higher resistance LLZTO/polymer interface, whereas LPS was observed to react with the polymer electrolyte to form an interphase.
Original languageEnglish
Article number60
Number of pages13
JournalInorganics
Volume10
Issue number5
DOIs
Publication statusPublished - 26 Apr 2022

Bibliographical note

Funding:
P.G.B. is indebted to the Faraday Institution All-Solid-State Batteries with Li and Na Anodes (FIRG007, FIRG008), the Engineering and Physical Sciences Research Council (EP/M009521/1) and The Henry Royce Institute for Advanced Materials for financial support (EP/R00661X/1, EP/S019367/1, EP/R010145/1). R.H.B. wishes to acknowledge the EPSRC for funding from grant numbers EP/R024006/1 and EP/P003532/1. A.A. acknowledges funding from EPSRC ICSF “Genesis: garnet electrolytes for new energy storage integrated solutions” (EP/R024006/1) and Horizon 2020 FETPROACT-2018-2020 “HARVESTORE”.

Keywords

  • solid-state battery
  • hybrid battery
  • interfaces
  • polymer electrolyte
  • solid electrolyte
  • solid-polymer electrolyte interphase

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