Experimental visualization of the diffusion pathway of sodium ions in the Na3[Ti2P2O10F] anode for sodium-ion battery.
Experimental visualization of the diffusion pathway of sodium ions in the Na3[Ti2P2O10F] anode for sodium-ion battery.
复制标题
钠离子电池Na3[Ti2P2O10F]负极中钠离子扩散路径的实验可视化
DOI：
10.1038/srep07231
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发表时间：
2014-11-27
影响因子：
4.6
通讯作者：
Chen L
中科院分区：
文献类型：
--
作者：
Ma Z;Wang Y;Sun C;Alonso JA;Fernández-Díaz MT;Chen L
钠离子电池作为锂离子电池的替代品，由于其低成本和天然丰富的钠资源，已经引起了相当大的兴趣。具有开放框架的材料非常适合na离子的插入/提取。本文报道了通过高温中子粉末衍射实验首次可视化了钠离子在Na3[Ti2P2O10F]中的扩散路径。用高温中子衍射（HTND）研究了Na3[Ti2P2O10F]在室温至600℃范围内钠离子位移的演变；利用差分傅里叶图估计Na核密度分布。温度驱动的钠离子位移表明钠离子在平面内建立了扩散路径。作为钠离子电池的阳极，Na3[Ti2P2O10F]具有~100 mAh g−1的可逆容量和较低的插入电压。它还显示出良好的循环稳定性和速率能力，使其在钠离子电池中有很好的应用前景。
Sodium-ion batteries have attracted considerable interest as an alternative to lithium-ion batteries for electric storage applications because of the low cost and natural abundance of sodium resources. The materials with an open framework are highly desired for Na-ion insertion/extraction. Here we report on the first visualization of the sodium-ion diffusion path in Na3[Ti2P2O10F] through high-temperature neutron powder diffraction experiments. The evolution of the Na-ion displacements of Na3[Ti2P2O10F] was investigated with high-temperature neutron diffraction (HTND) from room temperature to 600°C; difference Fourier maps were utilized to estimate the Na nuclear-density distribution. Temperature-driven Na displacements indicates that sodium-ion diffusion paths are established within theabplane. As an anode for sodium-ion batteries, Na3[Ti2P2O10F] exhibits a reversible capacity of ~100 mAh g−1with lower intercalation voltage. It also shows good cycling stability and rate capability, making it promising applications in sodium-ion batteries.