Abstract
In this work, via a simple liquid impregnation method, Co(BO2)2 nanoparticles are successfully loaded on the surface of Cr-based metal organic frameworks MIL-101 without destroying the three-dimensional organic frameworks. As received Co(BO2)2@MIL-101 composite shows the improved cyclability when serves as anode for rechargeable Li-ion batteries. The obtained Co(BO2)2@MIL-101 electrode demonstrates high reversible capacity of 810 mA h g−1 after 100 cycles at a current density of 200 mA g−1 and shows stable cycle performance (coulombic efficiency remains above 95%). The improvement could be attributed to MIL-101, which provides effective barrier spaces for Co(BO2)2 to relax the volumetric variation and maintains superior conductivity during the charge and discharge process.
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