Boosting the Li|LAGP interfacial compatibility with trace nonflammable all‐fluorinated electrolyte: The role of solid electrolyte interphase
Qi Liu,
Jiahao Yu,
Weiqian Guo,
Yanfang Pan,
Cuiping Han,
Hong‐bo Liu,
Baohua Li
Affiliations
Qi Liu
College of Materials Science and Engineering Hunan University Changsha Hunan China
Jiahao Yu
Shenzhen Key Laboratory of Power Battery Safety and Shenzhen Geim Graphene Center, Tsinghua Shenzhen International Graduate School Tsinghua University Shenzhen China
Weiqian Guo
Shenzhen Key Laboratory of Power Battery Safety and Shenzhen Geim Graphene Center, Tsinghua Shenzhen International Graduate School Tsinghua University Shenzhen China
Yanfang Pan
Shenzhen Key Laboratory of Power Battery Safety and Shenzhen Geim Graphene Center, Tsinghua Shenzhen International Graduate School Tsinghua University Shenzhen China
Cuiping Han
Faculty of Materials Science and Engineering Institute of Technology for Carbon Neutrality, Shenzhen Institute of Advanced Technology, Chinese Academy of Sciences (CAS) Shenzhen Guangdong China
Hong‐bo Liu
College of Materials Science and Engineering Hunan University Changsha Hunan China
Baohua Li
Shenzhen Key Laboratory of Power Battery Safety and Shenzhen Geim Graphene Center, Tsinghua Shenzhen International Graduate School Tsinghua University Shenzhen China
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 (Li1.5Al0.5Ge1.5(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.
