Pan Jun, Chen Shulin, Fu Qiang, Sun Yuanwei, Zhang Yuchen, Lin Na, Gao Peng, Yang Jian, Qian Yitai
Key Laboratory of Colloid and Interface Chemistry Ministry of Education School of Chemistry and Chemical Engineering , Shandong University , Jinan 250100 , P.R. China.
International Center for Quantum Materials, and Electron Microscopy Laboratory, School of Physics , Peking University , Beijing 100871 , P.R. China.
ACS Nano. 2018 Dec 26;12(12):12869-12878. doi: 10.1021/acsnano.8b08065. Epub 2018 Nov 21.
Sodium ion batteries are one of most promising alternatives to lithium ion batteries for large-scale energy storage, due to the high abundance and low cost of sodium in the earth. However, the lack of advanced electrode materials greatly affects their applications. Here, layered-structure SbPO is explored as an anode material for sodium ion batteries in terms of SbPO nanorods on reduced graphene oxide (SbPO/rGO). In situ transmission electron microscopy images reveal the preferential expansion along the transverse direction of the nanorods upon the first discharging, which arises from the reduction of SbPO to Sb and the subsequent alloying of Sb as supported by in situ X-ray diffraction and selected area electron diffraction patterns. SbPO/rGO exhibits a capacity retention of 99% after 100 cycles at 0.5 A g both in half cells and in full cells. Its specific capacity at 5 A g is 214 mA h g in half cells or 134 mA h g in full cells. Moreover, the energy density of the full cells at 1.2 kW kg is still 99.8 W h kg, very promising as an advanced electrode material.
钠离子电池因其在地球上钠的储量丰富且成本低，是大规模储能领域最有前景的锂离子电池替代方案之一。然而，缺乏先进的电极材料极大地影响了它们的应用。在此，基于还原氧化石墨烯上的 SbPO 纳米棒（SbPO/rGO），将层状结构的 SbPO 作为钠离子电池的负极材料进行探索。原位透射电子显微镜图像显示，首次放电时纳米棒沿横向优先膨胀，这是由于 SbPO 还原为 Sb 以及随后 Sb 的合金化，原位 X 射线衍射和选区电子衍射图谱证实了这一点。在半电池和全电池中，SbPO/rGO 在 0.5 A g 下循环 100 次后容量保持率为 99%。在 5 A g 时，其在半电池中的比容量为 214 mA h g，在全电池中的比容量为 134 mA h g。此外，全电池在 1.2 kW kg 时的能量密度仍为 99.8 W h kg，作为一种先进的电极材料非常有前景。
