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Na2FeP2O7 as a Promising Iron-Based Pyrophosphate Cathode for Sodium Rechargeable Batteries: A Combined Experimental and Theoretical Study

Cited 213 time in Web of Science Cited 215 time in Scopus
Authors
Kim, Heejin; Shakoor, R. A.; Park, Chansun; Lim, Soo Yeon; Kim, Joo-Seong; Jo, Yong Nam; Cho, Woosuk; Miyasaka, Keiichi; Kahraman, Ramazan; Jung, Yousung; Choi, Jang Wook
Issue Date
2013-03
Citation
Advanced Functional Materials, Vol.23 No.9, pp.1147-1155
Keywords
sodium ion batteriesiron pyrophosphatedensity functional theorythermal stability
Abstract
Considering the promising electrochemical performance of the recently reported pyrophosphate family in lithium ion batteries as well as the increasing importance of sodium ion batteries (SIBs) for emerging large-scale applications, here, the crystal structure, electrochemical properties, and thermal stability of Na2FeP2O7, the first example ever reported in the pyrophosphate family for SIBs, are investigated. Na2FeP2O7 maintains well-defined channel structures (triclinic framework under the P1 space group) and exhibits a reversible capacity of approximate to 90 mAh g1 with good cycling performance. Both quasi-equilibrium measurements and first-principles calculations consistently indicate that Na2FeP2O7 undergoes two kinds of reactions over the entire voltage range of 2.04.5 V (vs Na/Na+): a single-phase reaction around 2.5 V and a series of two-phase reactions in the voltage range of 3.03.25 V. Na2FeP2O7 shows excellent thermal stability up to 500 degrees C, even in the partially desodiated state (NaFeP2O7), which suggests its safe character, a property that is very critical for large-scale battery applications.
ISSN
1616-301X
URI
http://hdl.handle.net/10371/164590
DOI
https://doi.org/10.1002/adfm.201201589
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College of Engineering/Engineering Practice School (공과대학/대학원)Dept. of Chemical and Biological Engineering (화학생물공학부)Journal Papers (저널논문_화학생물공학부)
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