Affiliation:
1. State Key Laboratory of Chemical Resource Engineering Beijing Key Laboratory of Electrochemical Process and Technology for Materials Beijing University of Chemical Technology Beijing 100029 P. R. China
2. Beijing Advanced Innovation Center for Soft Matter Science and Engineering Beijing University of Chemical Technology Beijing 100029 P. R. China
Abstract
AbstractAlthough high ionic conductivities have been achieved in most solid‐state electrolytes used in lithium metal batteries (LMBs), rapid and stable lithium‐ion transport between solid‐state electrolytes and lithium anodes remains a great challenge due to the high interfacial impedances and infinite volume changes of metallic lithium. In this work, a chemical vapor‐phase fluorination approach is developed to establish a lithiophilic surface on rubber‐derived electrolytes, which results in the formation of a resilient, ultrathin, and mechanically integral LiF‐rich layer after electrochemical cycling. The resulting ultraconformal layer chemically connects the electrolyte and lithium anode and maintains dynamic contact during operation, thus facilitating rapid and stable lithium‐ion transport across interfaces, as well as promoting uniform lithium deposition and inhibiting side reactions between electrolyte components and metallic lithium. LMBs containing the novel electrolyte have an ultralong cycling life of 2500 h and deliver a high critical current density of 1.1 mA cm−2 in lithium symmetric cells as well as showing good stability over 300 cycles in a full cell.
Funder
National Natural Science Foundation of China
Fundamental Research Funds for the Central Universities