期刊
INORGANIC CHEMISTRY
卷 59, 期 15, 页码 10604-10610出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.inorgchem.0c01055
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资金
- Nanotechnology Platform of MEXT, Japan
- JST-CREST [JPMJCR15F2]
- JSPS KAKENHI [JP19H05460]
Bis(diimino)metal coordination frameworks (MDI, M = transition metal), which are a class of metal organic frameworks with two-dimensional anisotropy, high electric conductivity, and redox activity, are attractive platforms for tailoring electrochemical properties by introducing a heterometallic composition. In this study, we synthesized heterometallic CoxNi1-xDI coordination frameworks for electrochemical energy storage applications and investigated their electrochemical properties by experimental and theoretical techniques. Ni atoms were embedded into CoDI, and the crystal structure of CoxNi1-xDI was modified, especially along the interlayer axis, which activated the kinetically impeded redox reactions accompanied by PF6- insertion/extraction. Furthermore, upon charge/discharge with Li+ transport, CoxNi1-xDI with a specific composition exhibited higher specific capacity (248 mAh g(-1)) than CoDI and NiDI in the potential window of 1.0-3.5 V versus Li+/Li. Density functional theory calculations indicate that the energy levels of the antibonding orbitals around the metals and interlayer spaces are important factors in tailoring the electrochemical properties of CoxNi1-xDI.
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