A novel layered birnessite-type sodium molybdate as dual-ion electrodes for high capacity battery
A novel layered birnessite-type sodium molybdate as dual-ion electrodes for high capacity battery
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一种新型层状水钠锰矿型钼酸钠作为高容量电池双离子电极
DOI：
10.1016/j.electacta.2020.137229
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发表时间：
2020-12-10
影响因子：
6.6
通讯作者：
Wang, Qiang
中科院分区：
文献类型：
--
作者：
Li, Xuhai;Wang, Zhiqiang;Wang, Qiang
通过固相反应和水处理，首次合成了一种层间距离较大的birnite型Na1/3MoO2中心点H2O。得到的Na1/3MoO2中心点H2O经x射线结构精细化鉴定为相纯且结晶良好，呈典型的片状微观结构。令人惊讶的是，Na1/3MoO2中心点H2O可以同时用作锂离子电池（LIBs）的阳极和阴极电极，具有长循环寿命（阳极，500次循环，类似650 mAh g(-1)）和高容量300 mAh g-1（阴极）。基于密度泛函理论（DFT）计算，这种高性能归因于Na1/3MoO2中心点H2O的PF6-嵌入机制。该研究为电极材料的设计提供了一种有效的方法，并为Na1/3MoO2中心点H2O在大容量双离子电池（DIBs）中的应用提供了思路。(C) 2020 Elsevier Ltd.版权所有。
A birnessite-type Na1/3MoO2 center dot H2O with a large interlayer distance has been synthesized by solid-state reaction and water treatment for the first time. The obtained Na1/3MoO2 center dot H2O is phase-pure and wellcrystallized as determined by X-ray structure refinement and presents a typical plate-like microstructure. Surprisingly, the Na1/3MoO2 center dot H2O can be used as both anode and cathode electrodes for Li-ion batteries (LIBs), which shows long cycle life ((anode, 500 cycles similar to 650 mAh g(-1)), and high capacity of 300 mAh g-1 (cathode). This high performance is ascribed to the PF6- intercalation mechanism of Na1/3MoO2 center dot H2O based on the density functional theory (DFT) calculations. This work offers an efficient way for the design of electrode materials and sheds light on the application of the Na1/3MoO2 center dot H2O for high capacity dual-ion batteries (DIBs). (C) 2020 Elsevier Ltd. All rights reserved.