Electrode Property of Sintered Ceramic Based on CaMnO3 in LiOH Aqueous Solution
- 1 Graduate School of Engineering, Tottori University, Tottori 680-8552, Japan
- 2 Graduate School of Engineering, Tottori University, Tottori 680-8552, Japan
Abstract
Sintered ceramics of Ca 0.9 A 0.1 MnO 3-δ (A = La, Nd, Sm, Gd and Y) were studied on their cathode properties in LiOHaq. solution. After firing, the samples were obtained as high conductivity sintered (porous) materials composed of an orthorhombic perovskite-type phase. Next, charge discharge performances of the electrodes consisting of the sintered sample were investigated. The discharge capacity of Ca 0.9 Y 0.1 MnO 3-δ was 185 mAh·g -1 on the 1st cycling, and the 1st charging was possible by 130 mAh·g -1 . However, the 2nd discharge capacity remarkably decreased to lower than 50 mAh·g -1 . Considering no obvious charging property on the previous La-substituted sample of Ca 0.9 La0.1MnO 3-δ , it would mean that change of the substituent for CaMnO 3 affects the electrochemical property. The roll of lithium ions, the effect of the cut-off potential range on the cycle performance would be discussed leading to the charge/discharge results of the cell (-)Zn/LiOHaq./Ca 0.9 Y 0.1 MnO 3-δ (+).
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