Constructing a Multifunctional Interlayer toward Ultra‐High Critical Current Density for Garnet‐Based Solid‐State Lithium Batteries

• DOI: 10.1002/adfm.202300319
• Publication Date: 2023-04-25T13:29:53Z
• Authors: Min Gao; Zhinan Gong; Hongqiang Li; Haibin Zhao; Daming Chen; Yaqing Wei; De Li; Yuanxun Li; Liang Yang; Yong Chen
• Keywords: Indium tin oxide

Abstract All‐solid‐state lithium batteries (ASSLBs), exhibiting great advantages of high energy density and safety, are proposed to be the next generation storage system. However, successful commercialization garnet‐based ASSLBs is hindered by poor contact between solid‐state electrolytes (Li 6.25 Ga 0.25 La 3 Zr 2 O 12 , LGLZO) anode, as well low critical current (CCD). Herein, an indium tin oxide (ITO) layer prepared on LGLZO ultrasonic spraying technique, where ITO reacts with molten form a composite interlayer, consisting Li 13 In O, LiInSn. Experiments functional theory calculations demonstrate that such unique interlayer plays multifunctional role in achieving simultaneously better interface wettability, uniform deposition, dendrite suppression at Li/LGLZO interface. Consequently, CCD ITO‐treated symmetric cell increased record‐high value 12.05 mA cm −2 room temperature, which expected promote practical application ASSLBs. Moreover, Li/ITO@LGLZO/Li exhibits interfacial resistance only 5.9 Ω performs stable electrochemical operations for over 2000 h . The Li/ITO@LGLZO/LiFePO 4 full also delivers superior performances, demonstrating efficiency layer.