Layered Na[Ni_1/3Fe_1/3Mn_1/3]O₂ cathodes for Na-ion battery application

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• 作者：Donghan Kim ; Eungje Lee ; Michael Slater ; Wenquan Lu ; Shawn Rood ; Christopher S. Johnson ; ^{cjohnson@anl.gov}
• 关键词：Sodium ion batteries ; Na-ion ; Metal oxide ; Layered electrodes ; Carbon
• 刊名：Electrochemistry Communications
• 出版年：2012
• 期刊代码：29_13882481
• 类别：ch
• 出版时间：2012
• 卷：18
• 期：Complete
• 页码：66-69
• 文件大小：468 K

摘要

Na-ion batteries were tested with layered Na(Ni_1/3Fe_1/3Mn_1/3)O₂ cathodes and carbon anodes in a sodium-salt containing organic ester carbonate electrolyte. Layered single phase Na(Ni_1/3Fe_1/3Mn_1/3)O₂ was synthesized from solid-state reaction using a (Ni_1/3Fe_1/3Mn_1/3)C₂O₄ oxalate precursor and Na₂CO₃ fired at 850 掳C with slow-cooling. The Na-ion Na_yC/Na_{1 鈭?#xA0;y}(Ni_1/3Fe_1/3Mn_1/3)O₂ cell had an average voltage of ~ 2.75 V, modest capacity of 100 mA h g^鈭?#xA0;1 for 150 cycles (1.5-4.0 V), and a capacity of 94 mA h g^鈭?#xA0;1 at a 1 掳C rate. X-ray diffraction (XRD) data of extracted cycled electrodes were used to characterize material stability and phases formed upon cycling. It was found that Na_{1 鈭?#xA0;y}(Ni_1/3Fe_1/3Mn_1/3)O₂ (0 鈮?#xA0;y 鈮?#xA0;0.46) maintains a layered structure with good crystallinity over 150 cycles. These results bode well for the development and optimization of rechargeable Na-ion batteries.