High Capacity O3-Type Na[Li-0.05(Ni0.25Fe0.25Mn0.5)(0.95)]O-2 Cathode for Sodium Ion Batteries

Title
High Capacity O3-Type Na[Li-0.05(Ni0.25Fe0.25Mn0.5)(0.95)]O-2 Cathode for Sodium Ion Batteries
Author
선양국
Issue Date
2014-11
Publisher
AMER CHEMICAL SOC, 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
Citation
CHEMISTRY OF MATERIALS, 권: 26, 호: 21, 페이지: 6165-6171
Abstract
In this work we report Na[Li-0.05(Ni0.25Fe(0.25)Mn(0.5))(0.95)]O2 layered cathode materials that were synthesized via a coprecipitation method. The Na[Li-0.05(Ni(0.25)Fe0.25Mn(0.5))(0.95)]O-2 electrode exhibited an exceptionally high capacity (180.1 mA h g1 at 0.1 C-rate) as well as excellent capacity retentions (0.2 C-rate: 89.6%, 0.5 C-rate: 92.1%) and rate capabilities at various C-rates (0.1 C-rate: 180.1 mA h g1, 1 C-rate: 130.9 mA h g1, 5 C-rate: 96.2 mA h g1), which were achieved due to the Li supporting structural stabilization by introduction into the transition metal layer. By contrast, the electrode performance of the lithium-free Na[Ni0.25Fe0.25Mn0.5]O-2 cathode was inferior because of structural disintegration presumably resulting from Fe3+ migration from the transition metal layer to the Na layer during cycling. The long-term cycling using a full cell consisting of a Na[Li-0.05(Ni0(.25)Fe(0.25)Mn(0.5))(0.95)]O-2 cathode was coupled with a hard carbon anode which exhibited promising cycling data including a 76% capacity retention over 200 cycles.
URI
https://pubs.acs.org/doi/abs/10.1021/cm502481bhttp://hdl.handle.net/20.500.11754/50872
ISSN
0897-4756; 1520-5002
DOI
10.1021/cm502481b
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > ENERGY ENGINEERING(에너지공학과) > Articles
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