标题：Bi2S3in-situ formed in molten S environment stabilized sulfur cathodes for high-performance lithium-sulfur batteries
作者：Li, Xiaona ;Liang, Jianwen ;Lu, Yue ;Hou, Zhiguo ;Zhang, Wanqun ;Zhu, Yongchun ;Qian, Yitai
作者机构：[Li, Xiaona ;Lu, Yue ;Hou, Zhiguo ;Zhang, Wanqun ;Zhu, Yongchun ;Qian, Yitai ] Hefei National Laboratory for Physical Science at Microscale, Departmen 更多
来源：Journal of Power Sources
摘要：S/Bi2S3/C composites have been prepared based on melt strategy at 280 °C starting from metallic bismuth (mp 271.3 °C), excess sulfur powder and porous carbon with different ratio. In the as-prepared composites, the in-situ formed Bi2S3in molten S environment can homogeneously dispersed in S and carbon. Combining the physical confinement of porous carbon and chemical interaction of the in-situ formed Bi2S3, the dissolution of polysulfides has been well inhibited. Thus, the obtained S/Bi2S3/C composite exhibits good electrochemical performance, which could deliver capacity of ∼825 mAh g−1at 0.5 C over 400 cycles, with 91% capacity retention and high Coulombic efficiency.