期刊
CHEMSUSCHEM
卷 12, 期 11, 页码 2415-2420出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cssc.201900582
关键词
batteries; electrodes; intercalation; pseudocapacitors; sodium
资金
- National Natural Science Foundation of China [51722105]
- National Key Research and Development Program [2016YFB0901600]
- Zhejiang Provincial Natural Science Foundation of China [LR18B030001]
- Fundamental Research Funds for the Central Universities [2018XZZX002-08]
Great expectation is placed on sodium-ion batteries with high rate capability to satisfy multiple requirements in large-scale energy storage systems. However, the large ionic radius and high mass of Na+ hamper its kinetics in the case of diffusion-controlled mechanisms in conventional electrodes. In this study, a unique intercalation pseudocapacitance has been demonstrated in low-vacancy copper hexacyanoferrate, achieving outstanding rate capability. The minimization of the [Fe(CN)(6)] vacancy enables unhindered diffusion pathways for Na+ and little structural change during the Fe2+/Fe3+ redox reaction, eliminating solid-state diffusion limits. Moreover, the Cu+/Cu2+ couple is unexpectedly activated, realizing a record capacity for copper hexacyanoferrate. A capacity of 86 mAh g(-1) is obtained at 1 C, of which 50 % is maintained under 100 C and 70 % is achieved at 0 degrees C. Such intercalation pseudocapacitance might shed light on exploiting high-rate electrodes among Prussian blue analogs for advanced sodium-ion batteries.
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