Studies on micron-sized Na0.7MnO2.05 with excellent cycling performance as a cathode material for aqueous rechargeable sodium-ion batteries


Aqueous rechargeable sodium-ion batteries (ARSB) have great potential as large-scale storage devices owing to their low cost, high energy density, safety, and environmental friendliness. Here, micron-sized Na0.7MnO2.05, fabricated by a facile sol–gel method, is reported as a novel cathode material for ARSB and has been characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), transmission electron microscope (TEM), selected area electron diffraction/energy dispersive spectroscopy (ED/EDS) and X-ray photoelectron spectroscopy (XPS). As revealed, the material is perfectly synthesized. The Na0.7MnO2.05 electrode delivers an initial charge specific capacity of 42.6 mA h g−1 at a current density of 50 mA g−1. Compared with the capacity of 100th cycle (the highest discharge specific capacity of 52 mA h g−1), a capacity retention of 90.1% after 600 cycles is still observed. Good rate performance and excellent long-term cycling capability are also demonstrated. Unique morphology, medium-sized and mono-disperse particles facilitate the diffusion of Na+ in the electrode, which is also beneficial for Na0.7MnO2.05 electrode to exhibit excellent electrochemical performance.

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We gratefully acknowledge the support for this work from 973 Fundamental research program from the ministry of science and technology of China (Grant number 2010CB635116), NSFC project 21173190, Ningbo Science and Technology Bureau Project 2017A610023, Zhejiang Provincial Natural Science Foundation of China Y13B010020 and K.C.Wong Magna Fund in Ningbo University.

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Correspondence to Miao Shui.

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Gu, F., Yao, X., Sun, T. et al. Studies on micron-sized Na0.7MnO2.05 with excellent cycling performance as a cathode material for aqueous rechargeable sodium-ion batteries. Appl. Phys. A 126, 658 (2020).

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  • Na0.7MnO2.05
  • Aqueous rechargeable sodium batteries
  • Cathode materials