Boosting the Li|LAGP interfacial compatibility with trace nonflammable all‐fluorinated electrolyte: The role of solid electrolyte interphase. Issue 4 (15th February 2023)

• Record Type: Journal Article
• Authors: Liu, Qi; Yu, Jiahao; Guo, Weiqian; Pan, Yanfang; Han, Cuiping; Liu, Hong‐bo; Li, Baohua
• Is Part Of: EcoMat. Volume 5:Issue 4(2023)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2023-02-15
• Subjects: interfacial modification -- NASCION‐type electrolyte -- nonflammable electrolyte -- solid–liquid hybrid electrolytes -- solid‐state battery; Materials -- Environmental aspects -- Periodicals; Clean energy -- Periodicals; 621.042
• DOI: 10.1002/eom2.12322
• Languages: English
• ISSNs: 2567-3173

Abstract

Abstract: NASCION‐type lithium (Li) conductors provide a great chance to break the challenges of solid‐state lithium batteries (SSLBs) emphasizing superior safety and high energy density. Nonetheless, their practical employment has been hampered by the poor interfacial compatibility. Herein, we successfully block interfacial side reactions by in situ constructing a LiF‐enrich solid electrolyte interphase (SEI) layer between Li metal and LAGP (Li1.5 Al0.5 Ge1.5 (PO4 )3 ) through dropping trace fluoroacetonitrile‐based all‐fluorinated electrolyte. Noted that the formed high Young's modulus but fast‐kinetics LiF‐rich SEI layer successfully suppresses growth of Li dendrite, further tailoring the superior interfacial chemistry. Consequently, such robust SEI upgrades critical current density of LAGP to a record‐high value of >1.5 mA cm −2 . Furthermore, a hybride full cells assembled with the commercial‐level cathode deliver prominently cycling lifespan (>250 cycles) and outstanding rate performance. The present SEI engineering strategy enables a huge leap toward the industrialized deployments of SSLBs. Abstract : Dropping trace nonflammable fluoroacetonitrile‐based all‐fluorinated electrolyte is demonstrated to effectively solve the interfacial issues between LAGP and lithium. Such a facile but effective way enables the rapid formation of fast‐kinetics fluorinated interfaces (i.e., LiF‐enrich), significantly blocking interfacial side reactions and dendrite Li, further tailoring the superior interfacial chemistry in the hybrid full cells.