期刊
ELECTROCHIMICA ACTA
卷 332, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2019.135533
关键词
Prussian blue; Low-defect; Stability; Sodium-ion battery
资金
- National Basic Research Program of China [2015CB251100]
- National Natural Science Foundation of China [21673165, 21333007]
- supercomputing system in the Supercomputing Center of Wuhan University
Prussian blue compounds have been considered as attractive candidate cathodes for sodium ion battery (SIB) due to open channel structure, tunable chemical compositions and potential high capacity. However, their low capacity utilization and insufficient cyclability have hindered their large-scale applications. In this work, a series of Na-enrich PB lattices (NaxFe[Fe(CN)6](1-y) center dot zH(2)O) with different contents of [Fe(CN)6] vacancies and coordinated water are synthesized to investigate the effects of the lattice defects on the reversible capacities and cycling stabilities of the PB materials. It is found that decreasing the content of structural defects can greatly elevate the electrochemical performance of the PB cathodes. The as prepared low-defect and Nathorn-enriched Na1.81Fe[Fe(CN)(6)](0.83) center dot 2.04H(2)O lattice can achieve a high reversible capacity of >140 mAh g(-1), a superior rate capability with 55.2% of its initial capacity at 10 C and a long-term cyclability with 78% capacity retention over 3700 cycles, possibly serving as a low cost, high capacity and cycle-stable cathode for Na ion batteries. (C) 2019 Elsevier Ltd. All rights reserved.
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