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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

Journal Article · · Batteries & Supercaps
 [1];  [1];  [2];  [3];  [1];  [1]
  1. Institute of Physical Chemistry Justus-Liebig-University Giessen Heinrich-Buff-Ring 17 35392 Giessen Germany, Center for Materials Research (ZfM) Justus-Liebig-University Giessen Heinrich-Buff-Ring 16 35392 Giessen Germany
  2. Institute of Physical Chemistry Justus-Liebig-University Giessen Heinrich-Buff-Ring 17 35392 Giessen Germany
  3. Helmholtz Institute Ulm Helmholtzstraße 11 89081 Ulm Germany, Karlsruhe Institute of Technology (KIT) P.O. Box 3640 76021 Karlsruhe Germany
Abstract

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. This improves the understanding of the impedance response and lithium stripping in electrodes employing liquid interlayers, acting as a stepping‐stone for future optimization.

Sponsoring Organization:
USDOE
OSTI ID:
1772837
Alternate ID(s):
OSTI ID: 1786226
Journal Information:
Batteries & Supercaps, Journal Name: Batteries & Supercaps Journal Issue: 7 Vol. 4; ISSN 2566-6223
Publisher:
Wiley Blackwell (John Wiley & Sons)Copyright Statement
Country of Publication:
Germany
Language:
English

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