期刊
JOURNAL OF POWER SOURCES
卷 380, 期 -, 页码 135-141出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2018.01.083
关键词
Open-framework; Ternary electrolyte; Aqueous sodium-ion battery; Intercalation mechanism
资金
- Chinese Academy of Sciences [KGZD-EW-T08-2]
- National Natural Science Foundation of China [51404233]
- Natural Science Foundation of Zhejiang Province [LY1513030004]
- Youth Innovation Promotion Association CAS [2017341]
Non-flammable rechargeable aqueous sodium-ion batteries (RASB) made from natural abundant resources offer promising opportunities in large-scale energy storage, yet the low energy density as well as low voltage output and the limited cycle life hinder their practical applications. Here, we develop a high-voltage RASB based on rhombohedral zinc hexacyanoferrate as cathode materials, carbon-coated NaTi2(PO4)(3) as anode materials and ternary NaClO4-H2O-polyethylene glycol (Na-H2O-PEG) as electrolyte to overcome these drawbacks. Such an RASB can deliver a high voltage output of 1.6 V with a specific energy density of 59 Wh kg(-1) based on the total mass of active electrode materials. In addition, it possesses an excellent rate capability as an ultra-capacitor (2.7 kW kg(-1)). The capacity retention more than 91% is obtained after 100 cycles. Finally, a reversible phase transformation between rhombohedral Zn-3[Fe(CN)(6)](2) and rhombohedral Na2Zn3[Fe(CN)(6)](2) that are accompanied by the insertion/extraction of sodium ion in zinc hexacyanoferrate is unveiled.
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