Liu Tingting, Zhao Yang, Gao Lijun, Ni Jiangfeng
College of Physics, Optoelectronics and Energy &Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, Suzhou 215006, China.
Sci Rep. 2015 Mar 23;5:9307. doi: 10.1038/srep09307.
Bismuth oxide may be a promising battery material due to the high gravimetric (690 mAh g(-1)) and volumetric capacities (6280 mAh cm(-3)). However, this intrinsic merit has been compromised by insufficient Li-storage performance due to poor conductivity and structural integrity. Herein, we engineer a heterostructure composed of bismuth oxide (Bi2O3) and bismuth sulphide (Bi2S3) through sulfurization of Bi2O3 nanosheets. Such a hierarchical Bi2O3-Bi2S3 nanostructure can be employed as efficient electrode material for Li storage, due to the high surface areas, rich porosity, and unique heterogeneous phase. The electrochemical results show that the heterostructure exhibits a high Coulombic efficiency (83.7%), stable capacity delivery (433 mAh g(-1) after 100 cycles at 600 mA g(-1)) and remarkable rate capability (295 mAh g(-1) at 6 A g(-1)), notably outperforming reported bismuth based materials. Such superb performance indicates that constructing heterostructure could be a promising strategy towards high-performance electrodes for rechargeable batteries.
由于具有较高的重量比容量（690 mAh g⁻¹）和体积容量（6280 mAh cm⁻³），氧化铋可能是一种很有前景的电池材料。然而，由于导电性和结构完整性较差，其本征优点因锂存储性能不足而受到影响。在此，我们通过对Bi₂O₃纳米片进行硫化处理，构建了一种由氧化铋（Bi₂O₃）和硫化铋（Bi₂S₃）组成的异质结构。这种分级的Bi₂O₃ - Bi₂S₃纳米结构由于具有高表面积、丰富的孔隙率和独特的异质相，可作为高效的锂存储电极材料。电化学结果表明，该异质结构表现出高库仑效率（83.7%）、稳定的容量输出（在600 mA g⁻¹下循环100次后为433 mAh g⁻¹）和出色的倍率性能（在6 A g⁻¹下为295 mAh g⁻¹），明显优于已报道的铋基材料。这种优异的性能表明构建异质结构可能是制备高性能可充电电池电极的一种有前景的策略。
