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Published 2015 | Supplemental Material + Published
Journal Article Open

Unexpected discovery of low-cost maricite NaFePO_4 as a high-performance electrode for Na-ion batteries

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 NaFePO_4 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 NaFePO_4 with simultaneous transformation into amorphous FePO_4. Our quantum mechanics calculations show that the underlying reason for the remarkable electrochemical activity of NaFePO_4 is the significantly enhanced Na mobility in the transformed phase, which is ~ one fourth of the hopping activation barrier. Maricite NaFePO_4, fully sodiated amorphous FePO_4, 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).

Additional Information

© 2015 The Royal Society of Chemistry. Received 10th October 2014. Accepted 2nd December 2014. First published online 05 Jan 2015. This work was supported by the World Premier Materials grant funded by the Korea government Ministry of Trade, Industry and Energy and the Human Resources Development program (20124010203320) of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) grant funded by the Korea government Ministry of Trade, Industry and Energy.

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Created:
August 20, 2023
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October 20, 2023