A novel sulfur/carbon hollow microsphere yolk?shell composite as a high-performance cathode for lithium sulfur batteries
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- 作者：Guanghui Yuan ; Gang Wang ; Hui Wang ; Jintao Bai
- 关键词：Hollow carbon ; Yolk?shell structure ; Cathode material ; Lithium sulfur battery
- 刊名：Journal of Solid State Electrochemistry
- 出版年：2015
- 出版时间：April 2015
- 年：2015
- 卷：19
- 期：4
- 页码：1143-1149
- 全文大小：1,126 KB
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文摘
A hollow carbon microsphere (HC) material was synthesized by hydrothermal method, which could be used as a potential hard template. Active sulfur is encapsulated into the hollow carbon microspheres via simple impregnation and heat treatments to design a sulfur?hollow carbon microsphere (S?HC) composite with the novel yolk?shell structure. The hollow carbon shell, acts as a conductor to provide a highly conductivity and short Li+ diffusion distance, as well as absorbs polysulfides to improve the cycle ability of the S?HC composite in lithium sulfur (Li?S) batteries. The internal void space inside the shell can accommodate the volumetric expansion of sulfur during lithiation. The initial discharge capacity of S?HC cathode is as high as 1420?mA?h?g? at 0.1?C. After a 100?cycle stability test, the S?HC cathode exhibits still as high as 710?mA?h?g? at 0.2?C. Test results indicate that the S?HC composite is a promising host material for the sulfur cathode in the Li?S battery applications.