Synthesis and Performance Evaluation of Mno2/Ruo2/Carbon Composite Catalyst for Lithium-Air Battery

초록

Lithium–air battery has attracted great interest due to its high theoretical energy storage capacity. The performance improvement of cathode materials is one of the main goals because the overall energy storage efficiency can be increased with optimized cathode catalyst by reducing the charge and discharge overpotentials. We synthesized the catalyst composed of metal oxide nanoparticles (MnO2 and RuO2) with a carbon support. The composition ratio of metal oxide and carbon was 4:5. MnO2/C, RuO2/C, and the performance of electrode was evaluated using a Swagelok type cell. The physiochemical properties of synthesized samples were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), and X-ray diffraction (XRD). The electrochemical properties were studied by charge-discharge test. The improved cycle stability and reduced charge overpotentials were observed with the catalyst containing both MnO2 and RuO2 nanoparticle owing to its large surface area and redox property.