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A new sodium iron phosphate as a stable high-rate cathode material for sodium ion batteries
Nano Research ( IF 9.5 ) Pub Date : 2018-07-12 , DOI: 10.1007/s12274-018-2139-0
Xiaobo Zhu , Takashi Mochiku , Hiroki Fujii , Kaibin Tang , Yuxiang Hu , Zhenguo Huang , Bin Luo , Kiyoshi Ozawa , Lianzhou Wang

Low-cost room-temperature sodium-ion batteries (SIBs) are expected to promote the development of stationary energy storage applications. However, due to the large size of Na+, most Na+ host structures resembling their Li+ counterparts show sluggish ion mobility and destructive volume changes during Na ion (de)intercalation, resulting in unsatisfactory rate and cycling performances. Herein, we report a new type of sodium iron phosphate (Na0.71Fe1.07PO4), which exhibits an extremely small volume change (~ 1%) during desodiation. When applied as a cathode material for SIBs, this new phosphate delivers a capacity of 78 mA·h·g−1 even at a high rate of 50 C and maintains its capacity over 5,000 cycles at 20 C. In situ synchrotron characterization disclosed a highly reversible solid-solution mechanism during charging/discharging. The findings are believed to contribute to the development of high-performance batteries based on Earth-abundant elements.

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中文翻译:

新型磷酸铁钠作为钠离子电池稳定的高倍率正极材料

低成本的室温钠离子电池(SIB)有望促进固定式储能应用的发展。但是,由于Na +的尺寸较大,大多数类似其Li +对应物的Na +主体结构在Na离子(脱嵌)过程中显示出缓慢的离子迁移率和破坏性的体积变化,导致速率和循环性能不理想。在本文中,我们报道了一种新型的磷酸铁钠(Na 0.71 Fe 1.07 PO 4),其在除尘过程中表现出极小的体积变化(〜1%)。当用作SIB的阴极材料时,这种新型磷酸盐的容量为78 mA·h·g -1即使在50 C的高速率下,也能在20 C的条件下保持5,000个循环以上的容量。原位同步加速器的特性揭示了在充电/放电过程中具有高度可逆的固溶机理。据信,这些发现有助于开发基于富含地球元素的高性能电池。

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更新日期:2018-07-12
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