New Observation Structural Change from O3 to P2 Type by Changing Sodium Contents for Na-Ion Batteries
Stable Na+-ion-storage cathodes with adequate reversible capacities are increasingly needed for the application of Na-ion batteries in large-scale, low-cost electric storage systems. Ion-storage oxides have been classified into P2- and O3-type phases based on their sodium
content. There have been few studies on the structural stability and electrochemical properties of such oxides. Here, we report the synthesis of a sodium-ion battery (SIB) cathode material Na
x
[Ni0.8Co0.1Mn0.1]O2 (x = 0.67,
1) using a hydroxide co-precipitation method. The effects of different sodium contents on the structural and electrochemical properties of this cathode material were studied. The results indicated better electrochemical performance of the P2-type materials compared to the O3-type in terms
of high discharge capacity and good cycling performance. The P2-Na0.67[Ni0.8Co0.1Mn0.1]O2 cathode exhibited a good charge storage capacity of 108.74 mAhg−1, with a capacity retention of over 67% after 50 voltage cycles
(between 2.0 and 4.5 V) at 0.1 C. The developed material may potentially be used as a cathode in sodium-ion batteries.
Keywords: Cathode Materials; Sodium Contents; Sodium-Ion Battery
Document Type: Research Article
Affiliations: Department of Nano-Polymer Science and Engineering, Korea National University of Transportation Chungju, Chungbuk 380-702, Republic of Korea
Publication date: 01 March 2019
- Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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