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标题：Experimental visualization of the diffusion pathway of sodium ions in the Na3[Ti2P2O10F] anode for sodium-ion battery
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作者：Zhaohui Ma ; Yuesheng Wang ; Chunwen Sun 等
期刊名称：Scientific Reports
电子版ISSN：2045-2322
出版年度：2015
卷号：4
期号：1
DOI：10.1038/srep07231
语种：English
出版社：Springer Nature
摘要：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 the ab plane. As an anode for sodium-ion batteries, Na₃[Ti₂P₂O₁₀F] exhibits a reversible capacity of ~100 mAh g⁻¹ with lower intercalation voltage. It also shows good cycling stability and rate capability, making it promising applications in sodium-ion batteries.