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Bimetal cobalt-zinc MOF and its derivatives as anode materials for lithium-ion batteries

Liu Yunfei,Dong Shanghai,Wang Liying,Chen Guohua,Hou Yaping,Cao Zhenzhu,Zhang Yongfeng

The purplish-red rod-like crystal structure of novel bimetallic metal–organic-frameworks (MOF) {CoZn[(4,4′-BDA)(Phen)] 2 } n has been obtained by the reaction of Co 2+ , Zn 2+ (the molar ratio Co: Zn = 1:1), 1,10-phenanthroline (Phen) and 4, 4′-biphenyldicarboxylic acid (4,4′-H 2 BDA), in which Zn ions of the previously reported monometallic MOF {[Zn(4,4′-BDA)(Phen)] 2 ·(HCON(CH 3 ) 2 } n are partly substituted by Co ions. The crystal structure of {CoZn[(4,4′-BDA)(Phen)] 2 } n has been characterized by IR, X-ray photoelectron spectroscopy (XPS), and single-crystal X-ray diffraction analysis. Then, the precursors CoZn-MOF-B@C were obtained by adding a surfactant, activated carbon, and NaOH. Its derivative ZnO/CoO@C was used as anode material for lithium-ion batteries, which showed good lithium storage performance. The initial discharge specific capacity of ZnO/CoO@C is 1437.9 mAh g −1 at a current density of 0.2 A g −1 , and after 100 cycles, the specific capacity drops to 741.8 mAh g −1 .