期刊
JOURNAL OF POWER SOURCES
卷 227, 期 -, 页码 31-34出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2012.11.030
关键词
Na2FeP2O7; Sodium ion battery; Crystallization; Glass-ceramics
资金
- Ministry of Education, Science, Sport, Culture, and Technology, Japan [23246114, 23655194, 24656379]
- Program for High Reliable Materials Design and Manufacturing in Nagaoka University of Technology
- Ohkura-Kazuchika foundation
- Grants-in-Aid for Scientific Research [23655194, 24656379, 23246114] Funding Source: KAKEN
Triclinic Na2-xFe1+x/2P2O7/C composite was prepared by glass-ceramics method. We found that Na2-xFe1+x/2P2O7/C composite can be used as cathode active materials for Sodium ion battery with high current density rate performance over 10C (2 mA cm(-2)) condition and stable electrochemical cycle performance. A 2 mu m glass precursor powder in composition of Na2-xFe1+x/2P2O7 (x = 0-0.44) was crystallized in tubular furnace around 600 degrees C with carbon source to reduce iron valence state and to coat grain surface with carbon. By means of charge discharge testing Na2FeP2O7/C composite exhibits 86 mAh g(-1) (253 Wh kg(-1)) as reversible discharge energy density that is half amount of that for LiFePO4, however in 10C condition they kept 45 mAh g(-1) (110 Wh kg(-1)) even in 2 mu m grain size. (C) 2012 Elsevier B.V. All rights reserved.
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