期刊
MATERIALS LETTERS
卷 249, 期 -, 页码 206-209出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.matlet.2019.04.102
关键词
Yolk-shell structure; Nanoparticles; Fast ion-diffusion; Prussian blue analogues; Cathode materials; Energy storage and conversion
资金
- National Natural Science Foundation of China [21471162]
- Postgraduate Innovation Research Project of Central South University [2018zzts376]
Prussian blue analogues as cathode material for sodium-ion batteries suffer from poor cycling stability and inferior rate performance because of crystal defects and sluggish ion diffusion kinetics. The Na1.02Fe[Fe(CN)(6)](0.95)center dot square(0.05) Prussian blue nanoparticles with few lattice vacancies and a yolk-shell structure are designed and synthesized to address these two problems. The hierarchical structure endows yolk-shelled Prussian blue nanoparticles with large specific surface area, large pore volume and short ion pathways. As a result, the yolk-shell Prussian blue nanoparticles exhibit a high discharge capacity (140 mA h g(-1) at 0.1C), high-rate performance (51 mA h g (-1) at 10C) and excellent cycling stability (95.8% capacity retention after 500 cycles at 1C). (C) 2019 Elsevier B.V. All rights reserved.
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