Preparation of α-Fe[sub 2]O[sub 3] Electrode Materials via Solution Process and Their Electrochemical Properties in All-Solid-State Lithium Batteries

particles of various sizes were prepared by a solution process and were applied to the electrodes for all-solid-state lithium rechargeable batteries. The prepared was monodispersed particles with sizes controlled from about to . Their electrochemical properties were examined for the all-solid-state cells with highly conductive solid electrolytes and the influences of the particle size of on the electrochemical performance of the cells were investigated. The first discharge capacities increased with decreasing the particle size of and the cell using the smallest particles of showed the highest capacity of . The charge-discharge reaction mechanism in the all-solid-state cells was investigated by means of X-ray diffraction and was revealed to be similar to that in conventional cells with a liquid electrolyte. The lithium intercalation to occurred in the initial stage of the first discharge only in the cases using particles with small crystallite size, large specific surface area and large pore volume. By controlling the cutoff voltage, the all-solid-state cell retained the constant capacity of about for 15 cycles at the current density of . The rate capability at 25°C and temperature dependence of the first discharge capacity in the all-solid-state cells were also investigated. The cell at 60°C showed the larger first-discharge capacity of at the current density of 1.27 mA cm −2 .