High Capacity O3-Type Na[Li0.05(Ni0.25Fe0.25Mn0.5)0.95]O2 Cathode for Sodium Ion Batteries

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• 作者：Seung-Min Oh ; Seung-Taek Myung ; Jang-Yeon Hwang ; Bruno Scrosati ; Khalil Amine ; Yang-Kook Sun
• 刊名：Chemistry of Materials
• 出版年：2014
• 出版时间：November 11, 2014
• 年：2014
• 卷：26
• 期：21
• 页码：6165-6171
• 全文大小：554K
• ISSN：1520-5002

文摘

In this work we report Na[Li_0.05(Ni_0.25Fe_0.25Mn_0.5)_0.95]O₂ layered cathode materials that were synthesized via a coprecipitation method. The Na[Li_0.05(Ni_0.25Fe_0.25Mn_0.5)_0.95]O₂ electrode exhibited an exceptionally high capacity (180.1 mA h g^鈥? at 0.1 C-rate) as well as excellent capacity retentions (0.2 C-rate: 89.6%, 0.5 C-rate: 92.1%) and rate capabilities at various C-rates (0.1 C-rate: 180.1 mA h g^鈥?, 1 C-rate: 130.9 mA h g^鈥?, 5 C-rate: 96.2 mA h g^鈥?), which were achieved due to the Li supporting structural stabilization by introduction into the transition metal layer. By contrast, the electrode performance of the lithium-free Na[Ni_0.25Fe_0.25Mn_0.5]O₂ cathode was inferior because of structural disintegration presumably resulting from Fe³⁺ migration from the transition metal layer to the Na layer during cycling. The long-term cycling using a full cell consisting of a Na[Li_0.05(Ni_0.25Fe_0.25Mn_0.5)_0.95]O₂ cathode was coupled with a hard carbon anode which exhibited promising cycling data including a 76% capacity retention over 200 cycles.