Abstract
AbstractNa‐ion batteries (NIBs) are promising for grid‐scale energy storage applications. However, the lack of Co, Ni‐free cathode materials has made them less cost‐effective. In this work, Mg2+ is successfully utilized to activate the oxygen redox reaction in earth‐abundant Fe/Mn‐based layered cathodes to achieve reversible hybrid anionic and cationic redox capacities. A high first charge capacity of ≈210 mAh g−1 with balanced charge–discharge efficiency is achieved without O‐loss, showing a promising energy cost of $2.02 kWh−1. Full cell against hard carbon anode without pre‐sodiation shows energy density exceeding ≈280 Wh kg−1 with a decent capacity retention of 85.6% after 100 cycles. A comprehensive analysis of the charge compensation mechanisms and structural evolution is conducted. Voltage and capacity loss resulting from partially reversible Fe3+ migration to the Na layer is confirmed, shedding light on further improvements for low‐cost NIB cathodes in application scenarios.
Sign-in/Register to access full text options 
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.
