阳极
法拉第效率
材料科学
电化学
锑
电流密度
化学工程
电极
电池(电)
多孔性
离子
纳米技术
复合材料
化学
冶金
功率(物理)
物理
有机化学
物理化学
量子力学
工程类
作者
Haojie Zhang,Weili An,Hao Song,Ben Xiang,Shixiong Mei,Yemin Hu,Biao Gao
标识
DOI:10.1016/j.ssi.2020.115365
摘要
Antimony (Sb) is a promising sodium-ion anode material due to sustaining a high theoretical capacity of 660 mAh g−1. However, the huge volumetric change of 293% leads to serious pulverization and poor cycling stability. Herein, we design micro-sized porous Sb (PSb) via one-step chemical vapor dealloying. The as-prepared PSb owns three-dimensional nano-skeleton and interconnected pores, which enables PSb a high tap density (2.33 g cm−3), high electrochemical properties and robust ability to alleviate the volumetric expansion of sodiation. The PSb anode exhibits initial charge and discharge capacities of 834 and 517 mAh g−1 at a current density of 50 mA g−1, corresponding to an initial Coulombic efficiency (ICE) of 61.8%. And a high capacity retention of 80% is obtained after 120 cycles at a current density of 50 mA g−1. Moreover, the PSb sustains an outstanding rate performance with a capacity of 300 mAh g−1 even at a large current density of 3000 mA g−1. Compared with micro-Sb, the PSb exhibits a lower electrode swelling of 63.96% because the unique porous structure can effectively alleviate the volume variation and pulverization of Sb during cycling. The enhanced performance of PSb enables it as a promising anode material for advanced Sodium-Ion Batteries.
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