NaxMV(PO4)3 (M = Mn, Fe, Ni) Structure and Properties for Sodium Extraction

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• 作者：Weidong Zhou ; Leigang Xue ; Xujie Lü ; Hongcai Gao ; Yutao Li ; Sen Xin ; Gengtao Fu ; Zhiming Cui ; Ye Zhu ; John B. Goodenough
• 刊名：Nano Letters
• 出版年：2016
• 出版时间：December 14, 2016
• 年：2016
• 卷：16
• 期：12
• 页码：7836-7841
• 全文大小：639K
• ISSN：1530-6992

文摘

NASICON (Na⁺ super ionic conductor) structures of Na_xMV(PO₄)₃ (M = Mn, Fe, Ni) were prepared, characterized by aberration-corrected STEM and synchrotron radiation, and demonstrated to be durable cathode materials for rechargeable sodium-ion batteries. In Na₄MnV(PO₄)₃, two redox couples of Mn³⁺/Mn²⁺ and V⁴⁺/V³⁺ are accessed with two voltage plateaus located at 3.6 and 3.3 V and a capacity of 101 mAh g^–1 at 1 C. Furthermore, the Na₄MnV(PO₄)₃ cathode delivers a high initial efficiency of 97%, long durability over 1000 cycles, and good rate performance to 10 C. The robust framework structure and stable electrochemical performance makes it a reliable cathode materials for sodium-ion batteries.