期刊
ADVANCED ENERGY MATERIALS
卷 8, 期 11, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/aenm.201702856
关键词
dual insertion; Prussian blue; sodium cobalt nickel hexacyanoferrate; sodium-ion batteries; ternary metals
类别
资金
- National Key R&D Program of China [2016YFB010030X, 2016YFB0700600]
- National Natural Science Foundation of China [51772117, 51732005]
Prussian blue analogs (PBAs) are especially investigated as superior cathodes for sodium-ion batteries (SIBs) due to high theoretical capacity (approximate to 170 mA h g(-1)) with 2-Na storage and low cost. However, PBAs suffer poor cyclability due to irreversible phase transition in deep charge/discharge states. PBAs also suffer low crystallinity, with considerable [Fe(CN)(6)] vacancies, and coordinated water in crystal frameworks. Presently, a new chelating agent/surfactant coassisted crystallization method is developed to prepare high-quality (HQ) ternary-metal NixCo1-x[Fe(CN)(6)] PBAs. By introducing inactive metal Ni to suppress capacity fading caused by excessive lattice distortion, these PBAs have tunable limits on depth of charge/discharge. HQ-NixCo1-x[Fe(CN)(6)] (x = 0.3) demonstrates the best reversible Na-storage behavior with a specific capacity of approximate to 145 mA h g(-1) and a remarkably improved cycle performance, with approximate to 90% capacity retention over 600 cycles at 5 C. Furthermore, a dual-insertion full cell on the cathode and NaTi2(PO4)(3) anode delivers reversible capacity of approximate to 110 mA h g(-1) at a current rate of 1.0 C without capacity fading over 300 cycles, showing promise as a high-performance SIB for large-scale energy-storage systems. The ultrastable cyclability achieved in the lab and explained herein is far beyond that of any previously reported PBA-based full cells.
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