科研之友
微信
新浪微博
Facebook
分享链接
摘要
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(-1) at 0.1 C. After a 100 cycle stability test, the S-HC cathode exhibits still as high as 710 mA h g(-1) 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.
