4.6 Article

Bimetallic MOFs with tunable morphology: Synthesis and enhanced lithium storage properties

Journal

JOURNAL OF SOLID STATE CHEMISTRY
Volume 307, Issue -, Pages -

Publisher

ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jssc.2021.122726

Keywords

Bimetallic; Metal-organic frameworks; Co-Ni-MOF; Lithium storage; Anode

Funding

  1. Natural Science Funding Project of Guizhou Minzu University [[2018] 5773-YB14, [2018] 5773-YB15]
  2. Science and Technology Fund Project of Guizhou Province of China [[2020] 1Y211]

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By doping with cobalt ions during synthesis process, the morphology and lithium storage properties of bimetallic metal-organic frameworks can be improved. The Co-Ni-MOF electrode exhibits high specific capacity and good cyclic rate performance.
A series of isostructural bimetallic metal-organic frameworks (Co-Ni-MOF) were rationally synthesized by a facile one-step solvothermal method in the presence of varying mole ratios of Co/Ni mixed-metal ions. As the Co ion doping content decreased, the morphology of Co-Ni-MOF changed from irregular nanofragments to nanospheres. Meanwhile, doping Co ions in Ni-MOF can effectively improve the Li+ storage capacity. Attributing to the combined effect of metal ion reduction and successive lithiation of the organic ligands, the improved electrical conductivity and the synergetic advantages of Co and Ni, enhanced lithium storage properties of the prepared bimetallic MOFs have been achieved. Specifically, the Co-Ni-MOF electrode with a Co/Ni molar ratio of 1:1 displays a high reversible specific capacity of 800 mA h g(-1) with 98% specific capacity retention after 100 cycles at 100 mA g(-1) , as well as good rate capability (600 mA h g(-1) at 500 mA g(-1) and 380 mA h g(-1) at 1000 mA g(-1)).

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