Energetic aqueous rechargeable sodium-ion battery based on Na2 CuFe(CN)6 -NaTi2 (PO4 )3 intercalation chemistry.
Aqueous rechargeable sodium-ion batteries have the potential to meet growing demand for grid-scale electric energy storage because of the widespread availability and low cost of sodium resources. In this study, we synthesized a Na-rich copper hexacyanoferrate(II) Na2 CuFe(CN)6 as a high potential cathode and used NaTi2 (PO4 )3 as a Na-deficient anode to assemble an aqueous sodium ion battery. This battery works very well with a high average discharge voltage of 1.4 V, a specific energy of 48 Wh kg(-1) , and an excellent high-rate cycle stability with approximately 90 % capacity retention over 1000 cycles, achieving a new record in the electrochemical performance of aqueous Na-ion batteries. Moreover, all the anode, cathode, and electrolyte materials are low cost and naturally abundant and are affordable for widespread applications.
College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072 (PR China).
Xian-Yong
XY
Wu
Meng-Ying
MY
Sun
Yi-Fei
YF
Shen
Jiang-Feng
JF
Qian
Yu-Liang
YL
Cao
Xin-Ping
XP
Ai
Han-Xi
HX
Yang
D011211:Electric Power Supplies; D004566:Electrodes; D005295:Ferrocyanides / Q000737:chemistry*; D012964:Sodium / Q000737:chemistry*; D014025:Titanium / Q000737:chemistry*; D014867:Water / Q000737:chemistry
D005295:Ferrocyanides; C116383:ferrocyn; D014867:Water; C036532:titanium phosphate; D012964:Sodium; D014025:Titanium
aqueous electrolyte; electrochemistry; energy storage; intercalation chemistry; sodium-ion batteries