Labyrinth maze-like long travel-reduction of sulfur and polysulfides in micropores of a spherical honeycomb carbon to greatly confine shuttle effects in lithium-sulfur batteries  

作　　者：Yanyan Chang Jie Chen Zhuo Zou Juan Li Chao Wu Yali Jiang Yue Chen Qingxin Zeng Xiaoshui Wu Wei Sun Chang Ming Li 

机构地区：[1]Institute of Materials Science and Devices,School of Material Science and Engineering,Suzhou University of Science and Technology,Suzhou,215011,PR China [2]Institute of Clean Energy and Advanced Materials,School of Materials and Energy,Southwest University,Chongqing,400715,PR China [3]Jiuhuan Xinyue New Energy Technology Co.LTD,Qingdao,266071,PR China [4]College of Chemistry and Chemical Engineering,Hainan Normal University,Haikou,571158,PR China

出　　处：《Materials Reports(Energy)》2022年第4期54-61,共8页材料导报（能源）（英文）

基　　金：Supplementary data to this article can be found online at https://doi.org/10.1016/j.matre.2022.100159.

摘　　要：Polysulfide absorption in a micropore-rich structure has been reported to be capable of efficiently confining the shuttle effect for high-performance lithium-sulfur(Li–S)batteries.Here,a labyrinth maze-like spherical honeycomb-like carbon with micropore-rich structure was synthesized,which is employed as a template host material of sulfur to study the shuttle effects.The results strongly confirm that a diffusion controlled process rather than an absorption resulted surface-controlled process occurs in an even micropore-rich cathode but still greatly inhibits the shuttle effect.Thus,the battery achieves a high initial discharge specific capacity of 1120 mAh g1 at 0.25 C and super cycling stability for 1635 cycles with only 0.035%capacity decay per cycle with 100%Coulombic efficiency.We would like to propose a new mechanism for shuttle effect inhibition in micropores.In terms of the diffusion control process in microporous paths of a labyrinth maze structure,polysulfides experience a long travel to realize continuous reductions of sulfur and polysulfides until formation of the final solid product.This efficiently prevents the polysulfides escaping to electrolyte.The labyrinth maze-like honeycomb structure also offers fast electron transfer and enhanced mass transport as well as robust mechanical strength retaining intact structure for long cycle life.This work sheds lights on new fundamental insights behind the shuttle effects with universal significance while demonstrating prominent merits of a robust labyrinth maze-like structure in high performance cathode for high-performance Li–S batteries.

关 键 词：Lithium-sulfur batteries Labyrinth maze-like spherical honeycomb-like carbon Diffusion-controlled process Shuttle effects High performance 

分 类 号：TM912[电气工程—电力电子与电力传动]