Triclinic Na_2?xFe_1+x/2P₂O₇/C glass-ceramics with high current density performance for sodium ion battery

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• 作者：Tsuyoshi Honma ; ^{honma@mst.nagaokaut.ac.jp} ; Noriko Ito ; Takuya Togashi ; Atsushi Sato ; Takayuki Komatsu
• 关键词：Na2FeP2O7 ; Sodium ion battery ; Crystallization ; Glass-ceramics
• 刊名：Journal of Power Sources
• 出版年：2013
• 出版时间：1 April, 2013
• 年：2013
• 卷：227
• 期：Complete
• 页码：31-34
• 全文大小：412 K

文摘

Triclinic Na_2?xFe_1+x/2P₂O₇/C composite was prepared by glass-ceramics method. We found that Na_2?xFe_1+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?¦Ìm glass precursor powder in composition of Na_2?xFe_1+x/2P₂O₇ (x?=?0-0.44) was crystallized in tubular furnace around 600?¡ãC 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?¦Ìm grain size.