Browse

Unexpected discovery of low-cost maricite NaFePO4 as a high-performance electrode for Na-ion batteries

Cited 169 time in Web of Science Cited 166 time in Scopus
Authors
Kim, Jongsoon; Seo, Dong-Hwa; Kim, Hyungsub; Park, Inchul; Yoo, Jung-Keun; Jung, Sung-Kyun; Park, Young-Uk; Goddard, William A., III; Kang, Kisuk
Issue Date
2015-02
Citation
Energy and Environmental Sciences, Vol.8 No.2, pp.540-545
Abstract
Battery chemistry based on earth-abundant elements has great potential for the development of cost-effective, large-scale energy storage systems. Herein, we report, for the first time, that maricite NaFePO4 can function as an excellent cathode material for Na ion batteries, an unexpected result since it has been regarded as an electrochemically inactive electrode for rechargeable batteries. Our investigation of the Na re-(de)intercalation mechanism reveals that all Na ions can be deintercalated from the nano-sized maricite NaFePO4 with simultaneous transformation into amorphous FePO4. Our quantum mechanics calculations show that the underlying reason for the remarkable electrochemical activity of NaFePO4 is the significantly enhanced Na mobility in the transformed phase, which is similar to one fourth of the hopping activation barrier. Maricite NaFePO4, fully sodiated amorphous FePO4, delivered a capacity of 142 mA h g(-1) (92% of the theoretical value) at the first cycle, and showed outstanding cyclability with a negligible capacity fade after 200 cycles (95% retention of the initial cycle).
ISSN
1754-5692
URI
http://hdl.handle.net/10371/165063
DOI
https://doi.org/10.1039/c4ee03215b
Files in This Item:
There are no files associated with this item.
Appears in Collections:
College of Engineering/Engineering Practice School (공과대학/대학원)Dept. of Material Science and Engineering (재료공학부) Journal Papers (저널논문_재료공학부)
  • mendeley

Items in S-Space are protected by copyright, with all rights reserved, unless otherwise indicated.

Browse