期刊
CHEMELECTROCHEM
卷 5, 期 24, 页码 3887-3892出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/celc.201801277
关键词
Prussian white analogues; high rate; high capacity; size engineering; aqueous potassium-ion batteries
资金
- Shenzhen Science and Technology Research Grant [JCYJ20170412150450297]
- National Natural Science Foundation of China [21622407, 21673008, 21875266]
Aqueous potassium-ion batteries have demonstrated huge potential in the field of energy storage, owing to their low cost, environmental friendliness, and high safety, yet with poor cycling stability and rate capability. Here, potassium Prussian white analogues (K-PW) with different gradients in crystallinity and size have been synthesized by controlling the acidity of hydrothermal environment. The as-synthesized K1.93Fe[Fe(CN)(6)](0.97)center dot 1.82H(2)O nanoparticles deliver considerable reversible capacities of 142 mAh g(-1) at 75 mA g(-1), even 40 mAh g at 9000 mAg(-1), and high capacity retention of 88% after 300 cycles at 1500 mAg in a KNO3 aqueous electrolyte. High crystallinity and short ion-diffusion length determine the fast ion-intercalation kinetics and, thus, enable the superior rate capability. These results reveal the feasibility of using K-PW for practical applications in aqueous potassium-ion batteries.
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