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Mazzapioda et al. Energy Mater 2023;3:300019 Energy Materials
DOI: 10.20517/energymater.2023.03

Review Open Access

Quasi-solid-state electrolytes - strategy towards

stabilising Li|inorganic solid electrolyte interfaces in
solid-state Li metal batteries

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Lucia Mazzapioda , Akiko Tsurumaki , Graziano Di Donato , Henry Adenusi , Maria Assunta Navarra 1, * ,
Stefano Passerini 1,3,4, *
1
Department of Chemistry, Sapienza University of Rome, Rome 00185, Italy.
2
Hong Kong Quantum AI Lab, 17 Science Park West Avenue, Hong Kong, China.
3
Helmholtz Institute Ulm (HIU), Ulm D-89081, Germany.
4
Karlsruhe Institute of Technology (KIT), Karlsruhe D-76021, Germany.
*Correspondence to: Prof. Maria Assunta Navarra, Department of Chemistry, Sapienza University of Rome, Piazzale Aldo Moro 5,
Rome 00185, Italy. E-mail: mariassunta.navarra@uniroma1.it; Prof. Stefano Passerini, Helmholtz Institute Ulm (HIU),
Helmholtzstrasse 11, Ulm D-89081, Germany. E-mail: stefano.passerini@kit.edu
How to cite this article: Mazzapioda L, Tsurumaki A, Di Donato G, Adenusi H, Navarra MA, Passerini S. Quasi-solid-state
electrolytes - strategy towards stabilising Li|inorganic solid electrolyte interfaces in solid-state Li metal batteries. Energy Mater
2023;3:300019. https://dx.doi.org/10.20517/energymater.2023.03

Received: 27 Jan 2023 First Decision: 21 Feb 2023 Revised: 13 Mar 2023 Accepted: 7 Apr 2023 Published: 25 Apr 2023

Academic Editor: Yuping Wu Copy Editor: Fangling Lan Production Editor: Fangling Lan

Abstract
Solid-state batteries (SSBs) based on inorganic solid electrolytes (ISEs) are considered promising candidates for
enhancing the energy density and the safety of next-generation rechargeable lithium batteries. However, their
practical application is frequently hampered by the high resistance arising at the Li metal anode/ISE interface.
Herein, a review of the conventional solid-state electrolytes (SSEs) the recent research on quasi-solid-state battery
(QSSB) approaches to overcome the issues of the state-of-the-art SSBs is reported. The feasibility of ionic liquid
(IL)-based interlayers to improve ISE/Li metal wetting and enhance charge transfer at solid electrolyte interfaces
with both positive and lithium metal electrodes is presented together with a novel generation of IL-containing
quasi-solid-state-electrolytes (QSSEs), offering favourable features. The opportunities and challenges of QSSE for
the development of high energy and high safety quasi-solid-state lithium metal batteries (QSSLMBs) are also
discussed.

© The Author(s) 2023. Open Access This article is licensed under a Creative Commons Attribution 4.0
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