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Layered Electrodes Based on 3D Hierarchical Porous Carbon and Conducting Polymers for High‐Performance Lithium‐Sulfur Batteries
Author(s) -
Zeng Shuaibo,
Li Xin,
Zhong Hai,
Chen Shaowei,
Mai Yaohua
Publication year - 2019
Publication title -
small methods
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 4.66
H-Index - 46
ISSN - 2366-9608
DOI - 10.1002/smtd.201900028
Subject(s) - polysulfide , electrode , materials science , sulfur , cathode , chemical engineering , pedot:pss , polymer , dissolution , lithium (medication) , nanotechnology , electrolyte , composite material , chemistry , medicine , engineering , metallurgy , endocrinology
Easy dissolution of polysulfides and low loading of active materials are two major factors that limit the cathode cycling stability and energy density in lithium‐sulfur batteries. Herein, 3D hierarchical carbon with abundant pores is used for sulfur encapsulation (S@DHPC), which achieves a high sulfur content of 74 wt% and high sulfur loading of 5.8 mg cm −2 . Importantly, coating the obtained S@DHPC electrode with poly(3,4‐ethylenedioxythiophene)‐poly(styrenesulfonate) (PEDOT:PSS) conducting polymers is found to effectively impede the diffusion of polysulfide species, leading to marked improvement of the cycling stability of the electrode; and the electrode performance increases with an increasing number of the S@DHPC/PEDOT:PSS layer. For a three‐layer electrode, at a current density of 2 C, it delivers a discharge capacity of 846 mAh g −1 in the first cycle and maintains a capacity of 716 mAh g −1 after 500 cycles, corresponding to a fading rate of only 0.033% cycle −1 . Results from this study suggest that layered electrodes can be exploited as a unique electrode architecture for the fabrication of high‐performance lithium‐sulfur batteries.