| Summary: | 碩士 === 國立中興大學 === 材料科學與工程學系所 === 99 === In order to satisfy the need of batteries with the high voltage and the high current, the coating of 5V high voltage LiNixMn2-XO4 on stainless steel has been successfully prepared by a novel method for cathodes in thin film lithium batteries in this study. Through cathodic polarization tests, field emission scanning electron microscopy (FE-SEM), cyclic voltammetry (CV), x-ray diffraction (XRD) analysis and charge/discharge tests, it was found that the oxidation peaks at 4.02, 4.7 and 4.78 V and reduction peaks at 4.72, 4.65 and 3.97 V resulted from the overall cell reaction for the Li extraction/insertion reaction from/in the flake-like LiNixMn2-XO4 with spinel structure. The LiNixMn2-XO4 film deposited in solution with the ion ratio of Mn to Ni 4:1 and annealed at 500◦C, revealed the greater capacity 188 and 120 mAh/g for the first charge and discharge, respectively and 105 for the 20th cycle discharge at 50 μA/cm2 between 3.4 and 4.9 V, compared with other conditions. It was concluded that the capacity was related to the crystallinity and phase purity of LiNixMn2-XO4.
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