Two isomorphous coordination polymer-derived metal oxides as high-performance anodes for lithium-ion batteries†
Abstract
Two isomorphous 2D coordination polymers (CPs), [Co(L)2]n(1) and [Ni(L)2]n(2) (HL = 4-benzimidazole-1-yl-benzoic acid), have been synthesized under solvothermal conditions as precursors for metal oxides and characterized by single-crystal X-ray diffraction, revealing that both compounds 1 and 2 present porous 44 topology. The CP-derived metal oxides Co3O4 and NiO were prepared and examined as anodes for lithium-ion batteries in the potential range of 0.01–3.0 V. Both exhibit excellent cycle stability and high Coulombic efficiency at high current density, and the Co3O4 electrode presents superior electrochemical performance. Co3O4 can achieve a specific capacity of 569.8 mA h g−1 with 98% Coulombic efficiency after 50 cycles at a high current density of 2000 mA g−1.