Mechanochemical synthesis and electrochemical behavior of Na₃FeF₆ in sodium and lithium batteries

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• 作者：R.A. Shakoor^a ; Soo Yeon Lim^b ; Hyungsub Kim^c ; Kwan-Woo Nam^b ; Jeung Ku Kang^a ; ^b ; Kisuk Kang^c ; ^{matlgen1@snu.ac.kr} ; Jang Wook Choi^b ; ^{jangwookchoi@kaist.ac.kr}
• 关键词：Sodium iron fluoride ; Sodium and lithium batteries ; Cathode ; Mechanochemical process
• 刊名：Solid State Ionics
• 出版年：2012
• 期刊代码：96_01672738
• 类别：ch
• 出版时间：22 June, 2012
• 卷：218
• 期：Complete
• 页码：35-40
• 文件大小：1341 K

摘要

We report Na₃FeF₆ as a novel cathode material for sodium and lithium batteries. The material is synthesized through a mechanochemical process by reacting precursors (NaF and FeF₃) in a ball mill under argon flow. These syntheses are environmentally friendly and safe because the entire processes do not require any hazardous gasses or high temperatures. XRD spectra confirm that the synthesized material has a well-defined crystal structure and can be indexed to a monoclinic crystal structure under the P2₁/C space group. Thermal analyses up to 500 掳C confirm the stability of the crystal structure and safety of this material. Electrochemical results indicate that Na₃FeF₆ is electrochemically active in both Na and Li cells while undergoing conversion reactions and exhibiting decent reversible capacities of larger than 100 and 200 mAh g^鈭?#xA0;1 at room temperature, respectively.