Porous manganese oxides using hydrothermal method with surfactants for rechargeable lithium-air Battery

초록

Currently, tremendous researches have been investigated in transition metal oxides as electrode materials for energy storage system, because of their high redox property induced from various oxidation states. Among these oxides, manganese oxide is one of reasonable candidates as air cathode for lithium-air battery due to eco-friendly, high electric capacity and its low cost. In this study, the manganese oxide was successfully fabricated via hydrothermal method with various surfactants such as SDS, CTAB and F127. The surfactants containing various charge of head group formed different micelles in aqueous solution, leading to the diverse porous structure. Crystallinities of the synthesized manganese oxides were investigated by X-ray diffraction (XRD), and the surface composition was measured by X-ray photoelectron spectroscopy (XPS). The porous structure and surface morphology of the samples were also obtained by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). Brunauer-Emmer-Teller (BET) was used to determine surface area of porous manganese oxide. Charge-discharge performances were conducted using a potentiostat to evaluate electrochemical activity and stability for lithium-air battery.