期刊
ACS APPLIED MATERIALS & INTERFACES
卷 8, 期 23, 页码 14578-14585出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.6b03418
关键词
metal-organic framework; lithium-ion battery; redox activity; Coulombic efficiency; capability rate
资金
- 863 project [2013AA050906]
- Ningbo Natural Science Foundation [2014A610152, 2016A610278]
- China Postdoctoral Science Foundation [2015M570530, 2014M560499]
- National Natural Science Foundation of China [61504154]
Through rational organization of two redox active building block, a triphenylamine-based metal organic framework (MOF) material, Cu-TCA (H(3)TCA = tricarboxytriphenyl amine), was synthesized and applied as a cathode active material for the first time in lithium batteries. Cu-TCA exhibited redox activity both in the metal clusters (Cu+/Cu2+) and organic ligand radicals (N/N+) with separated voltage plateaus and a high working potential vs Li/Li+ up to 4.3 V, comparing with the current commercial LiCoO2 cathode materials. The electrochemical behaviors of this MOF electrode material at different states of charge were carefully studied by cyclic voltammetry, X-ray photoelectron spectroscopy, and photoluminescence techniques. Long cycling stability of this MOF was achieved with an average Coulombic efficiency of 96.5% for 200 cycles at a 2 C rate. Discussing the electrochemical performances on the basis of capacity contributions from the metal clusters (Cu+/Cu2+) and organic ligands (N/N+) proposes an alternative mechanism of capacity loss for the MOF materials used in lithium batteries. This improved understanding will shed light on the designing principle of MOF-based cathode materials for their practical application in battery sciences.
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