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首页> 外文期刊>RSC Advances >Synthesis, characterisation and enhanced electrochemical performance of nanostructured Na2FePO4F for sodium batteries
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Synthesis, characterisation and enhanced electrochemical performance of nanostructured Na2FePO4F for sodium batteries

机译：钠电池用纳米结构Na2FePO4F的合成，表征和增强的电化学性能

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摘要

Nanostructured pure Na2FePO4F was synthesised by a soft template method, followed by high-energy ball milling (HEBM) process and post-heat treatment. Physical and electrochemical properties of this sample were compared with as-prepared (pristine) sample. FESEM images recorded on the ball milled samples showed that the particles were of spherical morphology, with particle size centred around 100 nm. BET analysis illustrated a correlation between the surface area of the material with the electrochemical performance. Rietveld refinement of XRD patterns of the pristine and the HEBM samples together with the obtained reliability factor values demonstrated lower percentage of antisite disorder in HEBM sample. Compared to the pristine sample, which delivered an initial discharge capacity of only 87 mA h g(-1), the HEBM sample showed an impressive storage capacity of 116 mA h g(-1) at 0.1 C. Furthermore, at 1 C after 200 cycles, the ball milled sample displayed stable cyclability, retaining almost 80% of its initial discharge capacity, with an average coulombic efficiency of 99.4%. The improved sodium storage performance as compared to the pristine sample is discussed in terms of the reduced antisite disorder and associated sodium ion diffusion.
机译：通过软模板法合成纳米结构的纯Na2FePO4F，然后进行高能球磨（HEBM）工艺和后热处理。将该样品的物理和电化学性质与制备的（原始）样品进行了比较。球磨样品上记录的FESEM图像显示，颗粒呈球形，粒径集中在100 nm左右。 BET分析说明了材料的表面积与电化学性能之间的相关性。原始和HEBM样品的XRD图谱的Rietveld精炼以及获得的可靠性因子值表明，HEBM样品中抗位点紊乱的百分比较低。与原始样品的初始放电容量仅为87 mA hg（-1）相比，HEBM样品在0.1 C时显示出令人印象深刻的116 mA hg（-1）的存储容量。此外，在200次循环后于1 C ，球磨样品显示出稳定的可循环性，几乎保留了其初始放电容量的80％，平均库仑效率为99.4％。就减少的抗位点紊乱和相关的钠离子扩散而言，讨论了与原始样品相比改善的钠存储性能。

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