Mechanochemical treatment of maricite-type NaFePO4 for achieving high electrochemical performance
Mechanochemical treatment of maricite-type NaFePO4 for achieving high electrochemical performance
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DOI：
10.1007/s10008-017-3592-5
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发表时间：
2017-04
影响因子：
2.5
通讯作者：
R. Kapaev;A. Chekannikov;S. Novikova;S. Yaroslavtsev;T. Kulova;V. Rusakov;A. Skundin;A. Yaroslavtsev
中科院分区：
文献类型：
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作者：
R. Kapaev;A. Chekannikov;S. Novikova;S. Yaroslavtsev;T. Kulova;V. Rusakov;A. Skundin;A. Yaroslavtsev
为了满足对能量存储设备的日益增长的需求，并创造更安全、更便宜的高容量电池，必须使用基于容易获得且环境友好的原子量相对较低的元素（例如钠和铁）的材料。磷酸铁钠NaFePO 4（m-NFP）的水铝石型相被认为是电化学惰性的;然而，最近的研究质疑了这一说法。在本文中，我们提出了两种简便的方法，可扩展的合成纳米m-NFP及其复合材料与碳。纳米复合材料的初始低容量（15-27 mA h g−1）在行星式球磨之后增加到150 mA h g− 1，这导致缺陷和电化学活性非晶相的形成。
In order to satisfy a growing demand for energy storage devices and to create safer and less expensive batteries with high capacity, materials based on easily accessible and environmentally friendly elements with comparatively low atomic weights, such as sodium and iron, have to be used. A thermodynamically stable maricite-type phase of sodium iron phosphate NaFePO4(m-NFP) has been considered electrochemically inactive; however, recent studies have questioned this assertion. In this paper, we propose two facile approaches to a scalable synthesis of nanosized m-NFP and its composites with carbon. Initially low capacity of the nanocomposites (15–27 mA h g−1) increases up to ∼150 mA h g−1after planetary ball-milling, which leads to the formation of defects and electrochemically active amorphous phases.