期刊
ADVANCED FUNCTIONAL MATERIALS
卷 23, 期 9, 页码 1147-1155出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.201201589
关键词
sodium ion batteries; iron pyrophosphate; density functional theory; thermal stability
类别
资金
- National Research Foundation of Korea
- Korean Government (MEST) [NRF-2010-0029031, NRF-2012-R1A2A1A01011970, NRF-2011-0026038]
- World Class University Program [R-31-2008-000-10055-0]
- Ministry of Science, ICT & Future Planning, Republic of Korea [KINC02, N01130014] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- National Research Foundation of Korea [2012M1A2A2671812, 2012R1A2A1A01011970] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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.
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