A green ligand-based copper–organic framework: a high-capacity lithium storage material and insight into its abnormal capacity-increase behavior. (13th October 2020)

• Record Type: Journal Article
• Authors: Lou, Xiaobing; Hu, Xiaoshi; Xiang, Shuyan; Li, Chao; Yang, Qi; Hu, Bingwen
• Is Part Of: New journal of chemistry. Volume 44:Number 41(2020)
• Page Start: 17899
• Page End: 17905
• Publication Date: 2020-10-13
• Subjects: Chemistry -- Periodicals; Chimie -- Périodiques; 540
• DOI: 10.1039/d0nj04061d
• Languages: English
• ISSNs: 1144-0546

Abstract

Abstract : The abnormal capacity-increase behavior of high-Li-storage-performance Cu-CIT MOF is investigated by EPR and XAFS, which is found to be induced by gradual redox participation of metal centers during cycles. Abstract : Metal–organic frameworks (MOFs) are believed to be potential lithium storage materials for their redox activity that can uptake electron and porosity that in turn can favor ion transport and storage. To boost their performance and practical use, in this work, a green and cheap ligand citrate is first used in constructing a Cu-based MOF anode. The as-prepared Cu-CIT exhibits excellent capacity, stability, and rate capability, with the capacities of 608.5 and 321.5 mA h g −1 at 1 and 2 A g −1 after 500 cycles, being the best one among Cu-based MOFs. Moreover, its abnormal capacity-increase behavior is also observed and elaborately investigated through ex situ electron paramagnetic resonance (EPR) and X-ray absorption fine structure (XAFS). These results reveal the gradual redox participation of metal centers during cycles which for the first time shed light on the progressive activated process of MOFs in LIB applications.