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Working Principle of an Ionic Liquid Interlayer During Pressureless Lithium Stripping on Li$_{6.25}$Al$_{0.25}$La$_{3}$Zr$_{2}$O$_{12}$ (LLZO) Garnet-Type Solid Electrolyte

Fuchs, Till; Mogwitz, Boris; Otto, Svenja-Katharina; Passerini, Stefano 1; Richter, Felix H.; Janek, Jürgen
1 Karlsruher Institut für Technologie (KIT)


Solid-state-batteries employing lithium metal anodes promise high theoretical energy and power densities. However, morphological instability occurring at the lithium/solid–electrolyte interface when stripping and plating lithium during cell cycling needs to be mitigated. Vacancy diffusion in lithium metal is not sufficiently fast to prevent pore formation at the interface above a certain current density during stripping. Applied pressure of several MPa can prevent pore formation, but this is not conducive to practical application. This work investigates the concept of ionic liquids as “self-adjusting” interlayers to compensate morphological changes of the lithium anode while avoiding the use of external pressure. A clear improvement of the lithium dissolution process is observed as it is possible to continuously strip more than 70 μm lithium (i. e., 15 mAh cm$^{−2}$ charge) without the need for external pressure during assembly and electrochemical testing of the system. The impedance of the investigated electrodes is analyzed in detail, and contributions of the different interfaces are evaluated. The conclusions are corroborated with morphology studies using cryo-FIB-SEM and chemical analysis using XPS. ... mehr

Verlagsausgabe §
DOI: 10.5445/IR/1000135803
Veröffentlicht am 23.07.2021
DOI: 10.1002/batt.202100015
Zitationen: 23
Web of Science
Zitationen: 24
Zitationen: 27
Cover der Publikation
Zugehörige Institution(en) am KIT Helmholtz-Institut Ulm (HIU)
Publikationstyp Zeitschriftenaufsatz
Publikationsmonat/-jahr 07.2021
Sprache Englisch
Identifikator ISSN: 2566-6223, 2566-6223
KITopen-ID: 1000135803
HGF-Programm 38.02.01 (POF IV, LK 01) Fundamentals and Materials
Erschienen in Batteries & supercaps
Verlag John Wiley and Sons
Band 4
Heft 7
Seiten 1145–1155
Vorab online veröffentlicht am 26.03.2021
Nachgewiesen in Web of Science
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