Synthesis, Structure, and Electrochemical Properties of Some Cobalt Oxalates

Inorganic Chemistry
Jinghua CaiYongbing Tang

Abstract

Transition-metal oxalates have wide applications in magnetics, photoemission, electrochemistry, etc. Herein, using hydrothermal reactions, five cobalt(II) oxalates, Na2Co2(C2O4)3·2H2O ( I ), Na2Co(C2O4)2·8H2O ( II ), KLi3Co(C2O4)3 ( III ), Li4Co(C2O4)3 ( IV ), and (NH4)2Co2(C2O4)F4 ( V ) have been synthesized, and their structures are determined from single-crystal X-ray diffraction or Rietveld refinement of powder X-ray diffraction data. Notably, IV and V are identified for the first time. The structures of these cobalt oxalates are versatile, covering 0D, 1D, 2D, and 3D frameworks, while the coordination environments of Co2+ centers are uniquely distorted octahedra. As representative examples, I and III are investigated as cathode materials for secondary batteries. Both exhibited electrochemical activity despite large cell polarization. The present study enriches the transition-metal oxalate family and provides new options for energy storage materials.

References

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