Journal
JOURNAL OF POWER SOURCES
Volume 448, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.jpowsour.2019.227421
Keywords
Prussian blue; Cathode; Sodium-ion battery; Surface passivation; Humid sensitivity
Funding
- National Key R&D Program of China [2016YFB0100302]
- National Natural Science Foundation of China [51002054, 60306011]
- State Key Laboratory of Materials Processing and Die & Mould Technology of HUST
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Prussian blue analogs (PBAs) are considered as promising cathode materials in sodium-ion batteries. However, PBAs usually suffer from low electrical conductivity and high humid sensitivity, which results in the poor electrochemical kinetics and stability. In this work, a passivation strategy is proposed to solve these problems. The sodium iron hexacyanoferrate (PB) passivated by acetate ligands exhibits significantly improved electrochemical kinetics. It delivers a specific capacity of 128 mAh g(-1) at 25 mA g(-1). Even at 2 A g(-1), the capacity still retains 94.6 mAh g(-1). Most impressively, the passivated PB can maintain excellent electrochemical stability when exposed in the humid air for 7 days. Further investigations show that the strong physical interaction between the acetate ligands and the exposed Fe atoms can inhibit the readsorption of water and induce the electron transfer between low spin Fe and high spin Fe in PB. Thus, the surface passivation can efficiently enhance the electrical conductivity and electrochemical stability of PB.
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