Coordination-Modulated Metal Tetrathiafulvalene Octacarboxylate Frameworks for High-Performance Lithium-Ion Battery Anodes |
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Authors: | Zhi-Mei Yang Shu-Peng Zhao Meng-Hang Zhang Ze-Dong Zhang Tian-Rui Ma Prof Dr Shuai Yuan Prof Dr Jian Su Prof Dr Cheng-Hui Li Prof Dr Jing-Lin Zuo |
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Institution: | 1. State Key Laboratory of Coordination Chemistry, School of Chemistry and Chemical Engineering, Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing, 210023 P. R. China
These authors contributed equally to this work.;2. State Key Laboratory of Coordination Chemistry, School of Chemistry and Chemical Engineering, Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing, 210023 P. R. China |
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Abstract: | Modulation of the ligands and coordination environment of metal–organic frameworks (MOFs) has been an effective and relatively unexplored avenue for improving the anode performance of lithium-ion batteries (LIBs). In this study, three MOFs are synthesized, namely, M4(o-TTFOB)(bpm)2(H2O)2 (where M is Mn, Zn, and Cd; o-H8TTFOB is ortho-tetrathiafulvalene octabenzoate; and bpm is 2,2′-bipyrimidine), based on a new ligand o-H8TTFOB with two adjacent carboxylates on one phenyl, which allows us to establish the impact of metal coordination on the performance of these MOFs as anode materials in LIBs. Mn-o-TTFOB and Zn-o-TTFOB, with two more uncoordinated oxygen atoms from o-TTFOB8−, show higher reversible specific capacities of 1249 mAh g−1 and 1288 mAh g−1 under 200 mA g−1 after full activation. In contrast, Cd-o-TTFOB shows a reversible capacity of 448 mAh g−1 under the same condition due to the lack of uncoordinated oxygen atoms. Crystal structure analysis, cyclic voltammetry measurements of the half-cell configurations, and density functional theory calculations have been performed to explain the lithium storage mechanism, diffusion kinetics, and structure-function relationship. This study demonstrates the advantages of MOFs with high designability in the fabrication of LIBs. |
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Keywords: | Coordination Modulation Lithium-Ion Batteries Metal–Organic Frameworks Tetrathiafulvalene Ligands |
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