New Observation Structural Change from O3 to P2 Type by Changing Sodium Contents for Na-Ion Batteries.

Author(s) Kim, K.T.; Son, J.T.
Journal J Nanosci Nanotechnol
Date Published 2019 Mar 01
Abstract

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[NiCoMn]O₂ ( = 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-Na[NiCoMn]O₂ cathode exhibited a good charge storage capacity of 108.74 mAhg, 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.

DOI 10.1166/jnn.2019.16211
ISSN 1533-4880
Citation Kim K-, Son J-. New Observation Structural Change from O3 to P2 Type by Changing Sodium Contents for Na-Ion Batteries. J Nanosci Nanotechnol. 2019;19(3):1364-1367.