Activated metal-organic frameworks (a-MIL-100 (Fe)) as fillers in polymer electrolyte for high-performance all-solid-state lithium metal batteries. (June 2022)

• Record Type: Journal Article
• Authors: Wei, Tao; Wang, Zhimeng; Zhang, Mi; Zhang, Qi; Lu, Jiahao; Zhou, Yanyan; Sun, Cheng; Yu, Zidong; Wang, Yu; Qiao, Man; Qin, Sai
• Is Part Of: Materials today communications. Volume 31(2022)
• Publication Date: 2022-06
• Subjects: Solid composite electrolytes -- MIL-100 (Fe) -- All solid-state lithium metal batteries -- Metal-organic frameworks (MOFs) -- Density functional theory (DFT) calculations; Materials science -- Periodicals; 620.11
• DOI: 10.1016/j.mtcomm.2022.103518
• Languages: English
• ISSNs: 2352-4928

Abstract

Abstract: As a common filler in polymer electrolytes, Metal-organic frameworks (MOFs) has been studied extensively in recent years. In this study, we propose a novel solid composite electrolytes (SCEs) based on PEO/LiTFSI/a-MIL-100 (Fe)/PVDF by using a straightforward solution-casting method. Unactivated and activated MIL-100 (Fe) (a-MIL-100 (Fe)) as the fillers were compared, and the interactions of functional groups of unactivated MIL-100 (Fe) and a-MIL-100 (Fe) with anions of electrolyte salts through Lewis acid-base interaction are studied with density functional theory (DFT) calculations. The influences of different a-MIL-100 (Fe) contents on electrochemical performances were also examined. The Li/SCEs/LiFePO4 cell displayed high average discharge capacities of 161.8 mAh g −1, 166.8 mAh g −1, 158.9 mAh g −1, 146.2 mAh g −1 and 92.6 mAh g −1 at the rate of 0.1, 0.2, 0.5, 1 and 2 C at 60 ℃, respectively, without liquid electrolytes. This work might provide new insight into the role of activated MOFs fillers in polymer electrolytes. Graphical Abstract: ga1 Highlights: Activated metal-organic frameworks (a-MIL-100 (Fe)) was used as a filler in the solid composite electrolytes (SCEs) for all-solid-state lithium metal batteries. The interactions of functional groups of unactivated MIL-100 (Fe) and a-MIL-100 (Fe) with TFSI - through Lewis acid-base interaction are studied by DFT calculations. The influences of different a-MIL-100 (Fe) contents on electrochemical performances were also examined. The Li/SCEs/LiFePO4 cell displayed good electrochemical performances without liquid electrolytes.