材料科学
化学工程
复合材料
聚丙烯腈
纳米纤维
电解质
热稳定性
阴极
多孔性
涂层
纤维
碳化
作者
Yan Song,Jiangbo Lai,Xiuyuan Li,Jinrong Huo,Chen-Xu Zhao,Chaozheng He
标识
DOI:10.1016/j.matlet.2021.129933
摘要
Abstract Sulfurized polyacrylonitrile (SPAN) is a promising cathode candidate for lithium sulfur batteries based on the short sulfur chain in the backbone. Herein, to further boost electrochemical performance, the three-dimensional porous SPAN (TPSPAN) is constructed via a steaming method using sodium bicarbonate as a space-holder. Benefiting from the structure advantages of TPSPAN, the shuttle effect of polysulfides is restrained by the covalent molecular interactions and highly efficient channels are provided for electron transport and ionic diffusion. As cathode material, TPSPAN exhibits high reversible capacity of 1304 mAh g−1 at 0.1 A g−1 and superb rate capability of 986 mAh g−1 at 2.0 A g−1. Furthermore, the cathode can deliver outstanding long cycle stability with a higher capacity retention of about 94.6% after 1000 cycles at 2.0 A g−1. This work provides a prolongable strategy for developing electrode materials with porous architecture.
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