An interlayer with architecture that limits polysulfides shuttle to give a stable performance Li-S battery

By Cui, Yanhui; Wu, Xiaojun; Wu, Junwei; Zeng, Jiong; Baker, Andrew P.; Lu, Fei; Liang, Xiao; Ouyang, Jue; Huang, Jiayi; Liu, Xingbo; Li, Zhoufu; Zhang, Xinhe
Published in Energy Storage Materials NULL 2017

Abstract

Abstract A carbonized interlayer is effective for enhancing the electrochemical performance of a lithium sulfur (Li-S) battery. Here we report on two different interlayer architectures which are derived from cotton using simple preparation processes. One is a large pore volume carbon matrix (LCM) and the other is a porous carbon matrix with undulating zones partially covering the surface (UCM). These two interlayers are anticipated to restrain the shuttle effect of lithium polysulfides and improve the cycling stability. The {LCM} can be impregnated with 74.5 wt% sulfur and this is also used as the cathode for a Li-S battery. The electrochemical results show that cathode with {UCM} as the interlayer is superior with excellent cycling stability at 0.5 C and a specific capacity of 691 mAh g?1 after the 300th cycle. Even at 5.55 mg cm?2 sulfur loading the cathode with {UCM} interlayer can obtain an areal capacity of 3.2 mAh cm?2 at the 180th cycle. The method developed here is practical for the large-scale production of {LCM} and {UCM} interlayers for use in Li-S batteries.

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