NaFe3(HPO3)2((H,F)PO2OH)6: A Potential Cathode Material and a Novel Ferrimagnet

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• 作者：Irene Munaò ; Elena A. Zvereva ; Olga S. Volkova ; Alexander N. Vasiliev ; A. Robert Armstrong ; Philip Lightfoot
• 刊名：Inorganic Chemistry
• 出版年：2016
• 出版时间：March 7, 2016
• 年：2016
• 卷：55
• 期：5
• 页码：2558-2564
• 全文大小：455K
• ISSN：1520-510X

文摘

A novel iron fluorophosphite, NaFe₃(HPO₃)₂((H,F)PO₂OH)₆, was synthesized by a dry low-temperature synthesis route. The phase was shown to be electrochemically active for reversible insertion of Na⁺ ions, with an average discharge voltage of 2.5 V and an experimental capacity at low rates of up to 90 mAhg⁻¹. Simple synthesis, low-cost materials, excellent capacity retention, and efficiency suggest this class of material is competitive with similar oxyanion-based compounds as a cathode material for Na batteries. The characterization of physical properties by means of magnetization, specific heat, and electron spin resonance measurements confirms the presence of two magnetically nonequivalent Fe³⁺ sites. The compound orders magnetically at T_C ≈ 9.4 K into a state with spontaneous magnetization.