| Summary: | 碩士 === 國立臺北科技大學 === 製造科技研究所 === 107 === So far, Lithium-ion batteries used in portable electronic devices play an important role in our daily life. But the capacity and the current density of lithium-ion battery still can’t provide sufficient energy for electric cars.
Lithium-carbon-dioxide battery is a secondary storage device which can provide not only high capacity but also outstanding energy density. The energy density between gasoline and lithium-carbon-dioxide battery is almost the same. Owing to the high energy density, the capacity of lithium-carbon-dioxide battery has 10 times higher than commercial lithium-ion battery. Otherwise, the main greenhouse gas is carbon dioxide. If we can sufficiently use it, it is a benefit to our environment. The main product of discharging process is lithium carbonate. Because the bandgap of lithium carbonate is large, the charging voltage to decompose the product will be higher. In addition, the incomplete decomposition of lithium carbonate will result in the poor stability of the battery. In order to improve this phenomenon, we use molybdenum disulfide and cobalt sulfide composite materials to be additive in lithium carbon dioxide battery. By the characteristics of composite materials, the charging potential reduced from 4.5V to 4.3V and the cycle stability enhanced to 83 cycles.
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