Effects of Annealing Temperature on Microstructure and Electrochemical Properties of Perovskite-type Oxide LaFeO₃ as Negative Electrode for Metal Hydride/Nickel(MH/Ni) Batteries

Abstract

We reported the effects of annealing temperatures on microstructure and electrochemical properties of perovskite-type oxide LaFeO₃ prepared by stearic acid combustion method. X-Ray diffraction(XRD) patterns show that the annealed LaFeO₃ powder has orthorhombic structure. Scanning electron microscopy(SEM) and transmission electron microscopy(TEM) images show the presence of homogeneously dispersed, less aggregated, and small crystals(30―40 nm) at annealing temperatures of 500 and 600 °C. However, as the annealing temperature was increased to 700 and 800 °C, the crystals began to combine with each other and grew into further larger crystals(90―100 nm). The electrochemical performance of the annealed oxides was measured at 60 °C using chronopotentiometry, potentiodynamic polarization, and cyclic voltammetry. As the annealing temperature increased, the discharge capacity and anti-corrosion ability of the oxide electrode first increased and then decreased, reaching the optimum values at 600 °C, with a maximum discharge capacity of 563 mA·h/g. The better electrochemical performance of LaFeO₃ annealed at 600 °C could be ascribed to their smaller and more homogeneous crystals.

Keywords

Metal hydride/nickel(MH/Ni) battery / Negative electrode material / Perovskite LaFeO₃ / Microstructure / Electrochemical property

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