The effects of amino groups and open metal sites of MOFs on polymer-based electrolytes for all-solid-state lithium metal batteries

Abstract

Metal-organic frameworks (MOFs) are becoming more and more popular as the fillers in polymer electrolytes in recent years. In this study, a series of MOFs (NH2-MIL-101(Fe), MIL-101(Fe), activated NH2-MIL-101(Fe) and activated MIL-101(Fe)) were synthesized and added to PEO-based solid composite electrolytes (SCEs). Furthermore, the role of the —NH2 groups and open metal sites (OMSs) were both examined. Different ratios of MOFs vs polymers were also studied by the electrochemical characterizations. At last, we successfully designed a novel solid composite electrolyte containing activated NH2-MIL-101(Fe), PEO, LiTFSI and PVDF for the high-performance all-solid-state lithium-metal batteries. This work might provide new insight to understand the interactions between polymers and functional groups or OMSs of MOFs better.