| Summary: | 碩士 === 國立暨南國際大學 === 應用化學系 === 107 === Lithium-ion batteries play an important role in the energy storage field. With the broadening scope of the battery applications, the price of the currently utilized materials has been incessantly increasing. Therefore, development of new materials with considerable efficiency and lower price is necessary. Lithium and sodium are alkali metal elements with similar intercalation / extraction mechanisms. Although the energy density of sodium is lower than lithium, the price of sodium is cheaper and still has a competitive advantage in the next-generation energy storage.
In this work, an organic moiety melamine is intercalated into the structure of vanadium pentoxide synthesis forming a single phase hybrid vanadate, used as the cathode material in the sodium battery. An environment friendly hydrophilic polymer, polyacrylic acid is used as the binder in the place of traditionally used PVDF. An initial discharge capacity of 129 mAh g-1 is attainable with the 82% capacity retention after 40 cycles of charge/discharge when run at 0.1C- rate. Further heat treatment of the material assisted in the removal of crystal water which increased the initial discharge capacity to 168 mAh g-1.
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