Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 8, Issue 8, Pages 5393-5399Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.5b12620
Keywords
sodium-ion batteries; Prussian blue framework; lattice defects; controlled crystallization method; sodium cobalt hexacyanoferrate
Funding
- National Natural Science Foundation of China [21333007, 21303125]
- Specialized Research Fund for the Doctoral Program of Higher Education [20130141120007]
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Prussian blue and its analogues have received particular attention as superior cathodes for Na-ion batteries due to their potential 2-Na storage capacity (similar to 170 mAh g(-1)) and low cost. However, most of-the Prussian blue compounds obtained from the conventional synthetic routes contain large amounts of Fe(CN)(6) vacancies and coordinated water molecules, which leads to the collapse of cyano-bridged framework and: serious deterioration of their Na-storage ability. Herein, we propose a facile citrate-Assisted controlled crystallization method to obtain low-defect Prussian-blue lattice with greatly improved Na-storage capacity and cycling stability. As an example, the as-prepared Na2CoFe(CN)(6) nanocrystals demonstrate a reversible 2-Na storage reaction with a high specific capacity of 150 mAh g(-1) and, a similar to 90% capacity retention over 200 cycles, possibly serving as a low cost and high performance cathode for Na-ion batteries. In particular, the synthetic strategy described in this work may be extended to other coordination-framework materials for a wide range of energy conversion and storage applications.
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