O3-type Na(Mn0.25Fe0.25Co0.25Ni0.25)O2: A quaternary layered cathode compound for rechargeable Na ion batteries

• Published in: Electrochemistry communications 2014-12, Vol.49 (C), p.51-54
• Main Authors: Li, Xin, Wu, Di, Zhou, Yong-Ning, Liu, Lei, Yang, Xiao-Qing, Ceder, Gerbrand
• Format: Article
• Language: English
• Subjects: Applied sciences; CATHODES; Direct energy conversion and energy accumulation; Electrical engineering. Electrical power engineering; Electrical power engineering; Electrochemical conversion: primary and secondary batteries, fuel cells; ENERGY STORAGE; Exact sciences and technology; Na(Fe0.5Co0.5)O2; Na(Mn0.25Fe0.25Co0.25Ni0.25)O2; Na(Ni0.5Mn0.5)O2; Na-ion battery; NSLS; Quaternary; Sodium; Sodium battery
• ISSN: 1388-2481; 1873-1902
• DOI: 10.1016/j.elecom.2014.10.003

We report a new layered Na(Mn0.25Fe0.25Co0.25Ni0.25)O2 compound with O3 oxygen stacking. It delivers 180mAh/g initial discharge capacity and 578Wh/kg specific energy density with good cycling capability at high cutoff voltage. In situ X-ray diffraction (XRD) shows a reversible structure evolution of O3-P3-O3′-O3″ upon Na de-intercalation. The excellent capacity and cycling performance at high cutoff voltage make it an important model system for studying the general issue of capacity fading in layered Na cathode compounds. •We report a new layered quaternary Na(Mn0.25Fe0.25Co0.25Ni0.25)O2 compound with O3 oxygen stacking.•It delivers 180mAh/g initial discharge capacity and 578Wh/kg specific energy density with good cycling capability at high cutoff voltage.•In situ X-ray diffraction (XRD) shows a reversible structure evolution of O3-P3-O3′-O3″ upon Na deintercalation.•The excellent capacity and cycling performance at high cutoff voltage makes it an important model system for studying the general issue of capacity fading in layered Na cathode compounds.