Abstract
Na0.44MnO2 microrods with high crystallinity have been prepared by a simple solid-phase method and then coated with In2O3 by precipitation method. 1 wt% In2O3 coating could improve the sodium-storage capability of Na0.44MnO2 microrods significantly. The original Na0.44MnO2 microrods could provide the maximum discharge capacity of 100.3 mAh g−1 under a wide voltage of 2.0–4.5 V at 1 C, but the discharge capacity rapidly decreases to 70.4 mAh g−1 after 400 cycles, which was only 70.3% of the maximum capacity. However, the Na0.44MnO2 coated with 1 wt% In2O3 exhibited a high discharge capacity of 90.9 mAh g−1 after 400 cycles, with high-capacity retention of 86.7% in the same case. Moreover, compared with Na0.44MnO2, 1 wt% In2O3 coated Na0.44MnO2 shows better rate capability. Even at a high current density of 10 C, the discharge capacity is 63.6 mAh g−1, much larger than the 32.9 mAh g−1 of the pristine Na0.44MnO2. The mechanism of In2O3 coating improving the electrochemical performance of Na0.44MnO2 microrods was studied in detail.
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