期刊
JOURNAL OF POWER SOURCES
卷 436, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.jpowsour.2019.226868
关键词
Sodium ion batteries; Cathode; Prussian blue analogue; Ion-exchange; Hierarchical structure
资金
- National Key Research and Development Program [2016YFB0901501]
- National Natural Science Foundation of China [51772030]
- Joint Funds of the National Natural Science Foundation of China [U1564206]
Prussian blue and its analogues are regarded as promising cathodes for sodium ion batteries. However, the structural stability and interfacial compatibility of Prussian blue cathode are major issues for achieving superior performance. Sodium copper hexacyanoferrate is synthesized by an ion-exchange method, with large specific surface area and hierarchical core-shell structure. When used as cathode for half-cell, the material delivers an initial capacity of similar to 90 mAh g(-1) and maintain more than 81% capacity retention after 1000 cycles. Even at a high rate of 20C, an impressive capacity of similar to 50 mAh g(-1) is retained. Especially, a full-cell assembled by sodium copper hexacyanoferrate cathode and NaTi2(PO4)(3)@C anode shows a high capacity of more than 80 mA h g(-1) for 400 cycles. A series of electrochemical techniques and in situ tests are carries out to confirm the advantages of stable structure and high conductivity after dopping copper ions. Furthermore, the low adsorption energy of Na+ on cathode surfaces is revealed by the first principle calculation.
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