Na0.44MnO2 coated with In2O3 as a high-voltage cathode for sodium-ion batteries

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. (C) 2021 Elsevier B.V. All rights reserved.

Automated summary

The study demonstrates that coating Na0.44MnO2 microrods with 1 wt% In2O3 by precipitation method can significantly improve sodium storage capability, enhance cycling stability, and boost rate performance.