Synthesis and Rechargeable Properties of Na2/3Fe1/3Mn2/3O2 Cathode Active Materials

概要

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Na2/3Fe1/3Mn2/3O2 cathode active materials were prepared by spray pyrolysis. As-prepared powders had spherical morphology with dense microstructure which had an average diameter of about 1 µm with broad size distribution.The particle morphology of Na2/3Fe1/3Mn2/3O2 cathode active materials were influenced by the calcination and the polygonal morphology was obtained at 900 °C. XRD showed that as-prepared powders was well crystallized to P2 type structure after the calcination at 800 °C. The electrochemical measurement of Na2/3Fe1/3Mn2/3O2 cathode showed that the two plateaus were observed at 3 V and 4.3 V in rechargeable curve and the discharge capacity of Na2/3Fe1/3Mn2/3O2 cathode was 203 mAh/g at 0.01C. After 100th cycle, the discharge capacity and capacity retention of Na2/3Fe1/3Mn2/3O2 cathode was 116 mAh/g and 70 % at 0.1C, respectively.