Abstract
With the development of the sodium-ion batteries (SIBs), high rate capability and long cycle life are critical to the application. In this work, a new quinary O3-type MgCo-NaMnNiAlO as a cathode material for SIBs has been synthesized by hydrothermal reaction and solid-state reaction. It can deliver a reversible capacity of 118, 109, 88 and 73 mAh g−1 at a rate from 1 to 10 C. At 1 C, the prepared cathode shows a superior cycle stability under high current density that 82% of the initial rate capacity could be maintained in 1000 cycles with a capacity loss rate of 0.018% in every cycle. During sodiation/desodiation, Mn and Ni were used to provide capacity at low-voltage area and high-voltage area, respectively. What is more, Co ions promote the charge compensations. Furthermore, Al and Mg ions enhance the charge transfer which could play a significant role in stabilizing the structure during Na+ deintercalation/intercalation by means of suppressing O3–P3 phase transition. In addition, Mg doping also can form synergistic effect with Al ion and accelerate Na ion migration rate during circulation under room temperature. The advanced characterization of in situ XRD demonstrates structural changes in Na-ion batteries and promotes an understanding of the structure and properties of five-element O3 materials.
Published Version
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
