NDLI: Electrochemical properties and structural evolution of O3-type layered sodium mixed transition metal oxides with trivalent nickel

Content Provider	Royal Society of Chemistry (RSC)
Author	Ceder, Gerbrand Dacek, Stephen T. Shi, Tan Seo, Dong-Hwa Vassilaras, Plousia Kim, Jae Chul Kwon, Deok-Hwang
Copyright Year	2017
Abstract	The electrochemical properties of NaNi0.5Co0.5O2 and NaNi0.5Fe0.5O2 and their structural transitions as a function of Na extraction associated with redox reactions are investigated in this work. Synthesized in the O3-type layered structure, both materials show reasonable electrochemical activities at room temperature, delivering approximately 0.5 Na per formula unit at C/10 discharge. More Na can be reversibly cycled in NaNi0.5Co0.5O2 at elevated temperature and/or in an extended voltage window, while NaNi0.5Fe0.5O2 shows significant capacity fading at a high voltage cutoff which is likely due to Fe4+ migration. In situ X-ray diffraction shows that the structural changes in the two materials upon desodiation are very different. NaNi0.5Co0.5O2 goes through many different two-phase reactions including three different O3-type and three different P3-type structures during cycling, producing a voltage profile with multiple plateau-like features. In contrast, NaNi0.5Fe0.5O2 has a smooth voltage profile and shows the typical O3–P3 phase transition without lattice distortion seen in other materials. This different structural evolution upon desodiation and re-sodiation can be explained by the electronic structure of the mixed transition metals and how it perturbs the ordering between Na ions differently.
Starting Page	4596
Ending Page	4606
Page Count	11
File Format	HTM / HTML PDF
ISSN	20507488
Volume Number	5
Issue Number	9
Journal	Journal of Materials Chemistry A
DOI	10.1039/c6ta09220a
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Electrochemistry Redox Formula unit X-ray crystallography Phase transition Crystal structure
Content Type	Text
Resource Type	Article
Subject	Chemistry Renewable Energy, Sustainability and the Environment Materials Science

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