Synergistic Approach toward Developing Highly Compatible Garnet‐Liquid Electrolyte Interphase in Hybrid Solid‐State Lithium‐Metal Batteries

• DOI: 10.1002/aenm.202203897
• Publication Date: 2023-01-05T20:48:35Z
• Authors: Subhajit Sarkar; Bowen Chen; Chengtian Zhou; Shahram Nouri Shi...; Frederieke Langer; Julian Schwenzel; Venkataraman Than...
• Keywords: Interphase; Fast ion conductor; Electrochemical window; Lithium metal

Abstract The hybrid solid‐liquid electrolyte concept is one of the best approaches for counteracting interface problems between solid electrolytes and Li anodes/cathodes. However, a layer forming at interfaces degrades battery capacity power during longer cycle due to highly reactive chemical electrochemical reactions. To solve this problem in present study, synthetic approach demonstrated by combining AlCl 3 Lewis acid fluoroethylene carbonate as additives conventional LiPF 6 ‐containing carbonate‐based electrolyte. This design triggers polymerization addition can also form mechanically robust ionically conductive Al‐rich interphase on surface 7 La 2.75 Ba 0.25 Zr 1.75 Ta O 12 garnet‐type structured electrolytes, anodes LiNi 0.6 Mn 0.2 Co 2 cathodes. Benefitting from approach, assembled symmetric cell exhibits remarkably high critical current density 4.2 mA cm −2 , stable long‐term cycling over 3000 h 0.5 25 °C. full shows an impressive specific retention 92.2% 1 C till 200 cycles. work opens new direction developing safe, long‐lasting, high‐energy solid‐state lithium‐metal batteries.