| MnO2-carbon composites with various Mn/C ratios were prepared by precipitation method. The composites were cast onto Ni foam to be evaluated as cathodes of Li-air battery. Charge-discharge tests were carried out by using a Swagelok type cell in an 1 M LiPF6 in a mixture of propylene carbonate (PC), ethylene carbonate (EC) and diethyl carbonate (DEC) (1:1:2 weight ratio). The influence of Mn/C ratio on both capacity and charge/discharge behavior was investigated. The cycle performance of Li/O2 batteries was strongly dependent on Mn/C ratio. With increasing amount of MnO2, the cycle performance of Li/O2 batteries improved. The influence of electrolyte amount was also investigated, and the best cycle performance was achieved when 90 µL of electrolyte was used. |
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