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SnP2O7 Covered Carbon Nanosheets as a Long‐Life and High‐Rate Anode Material for Sodium‐Ion Batteries
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2018-09-11 , DOI: 10.1002/adfm.201804672 Jun Pan 1 , Shulin Chen 2, 3 , Dapeng Zhang 1 , Xuena Xu 1 , Yuanwei Sun 2 , Fang Tian 1 , Peng Gao 2, 4 , Jian Yang 1
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2018-09-11 , DOI: 10.1002/adfm.201804672 Jun Pan 1 , Shulin Chen 2, 3 , Dapeng Zhang 1 , Xuena Xu 1 , Yuanwei Sun 2 , Fang Tian 1 , Peng Gao 2, 4 , Jian Yang 1
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SnP2O7 attached to reduced graphene oxide (rGO) is synthesized by a solvothermal reaction, followed by a mild annealing in Ar/H2. As an anode material for sodium‐ion batteries, this composite is associated with the conversion reaction between Sn and SnP2O7 and the alloy reaction between Sn and NaxSn, as evidenced by ex situ techniques, such as high‐resolution transmission electron microscope images, selected area electron diffraction patterns, and X‐ray diffraction patterns. The close contact between SnP2O7 and rGO facilitates the charge transfer upon cycling and benefits the preservation of SnP2O7 on rGO even after pulverization. Therefore, this composite exhibits an extraordinary cycling stability. 99% of the initial capacity is remained after 200 cycles at 0.2 A g−1 and also 99% is kept after 1000 cycles at 1.0 A g−1. The similar results are also observed in full cells. Quantitative kinetic analysis confirms that sodium storage in this composite is governed by pseudocapacitance, especially at high rates. These results indicate the promising potential of metal pyrophosphates in sodium‐ion batteries.
中文翻译：
SnP2O7覆盖的碳纳米片作为钠离子电池的长寿命和高倍率阳极材料
通过溶剂热反应，然后在Ar / H 2中进行温和退火，合成了附着在还原型氧化石墨烯（rGO）上的SnP 2 O 7。作为钠离子电池的负极材料，这种复合材料与Sn和SnP 2 O 7之间的转化反应以及Sn和Na x Sn之间的合金反应有关，这是通过非原位技术（例如高分辨率透射电子）证明的。显微镜图像，选定区域的电子衍射图和X射线衍射图。SnP 2 O 7和rGO之间的紧密接触有助于循环时的电荷转移，并有利于SnP 2 O的保存粉碎后在rGO上为7。因此，该复合材料表现出非凡的循环稳定性。在200次循环后以0.2 A g -1保留了99％的初始容量，在1000次循环后以1.0 A g -1保留了99％的初始容量。在全细胞中也观察到相似的结果。定量动力学分析证实，该复合材料中的钠存储受假电容控制，特别是在高倍率下。这些结果表明，焦磷酸金属盐在钠离子电池中具有广阔的发展潜力。
更新日期：2018-09-11
中文翻译：
SnP2O7覆盖的碳纳米片作为钠离子电池的长寿命和高倍率阳极材料
通过溶剂热反应，然后在Ar / H 2中进行温和退火，合成了附着在还原型氧化石墨烯（rGO）上的SnP 2 O 7。作为钠离子电池的负极材料，这种复合材料与Sn和SnP 2 O 7之间的转化反应以及Sn和Na x Sn之间的合金反应有关，这是通过非原位技术（例如高分辨率透射电子）证明的。显微镜图像，选定区域的电子衍射图和X射线衍射图。SnP 2 O 7和rGO之间的紧密接触有助于循环时的电荷转移，并有利于SnP 2 O的保存粉碎后在rGO上为7。因此，该复合材料表现出非凡的循环稳定性。在200次循环后以0.2 A g -1保留了99％的初始容量，在1000次循环后以1.0 A g -1保留了99％的初始容量。在全细胞中也观察到相似的结果。定量动力学分析证实，该复合材料中的钠存储受假电容控制，特别是在高倍率下。这些结果表明，焦磷酸金属盐在钠离子电池中具有广阔的发展潜力。
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