细菌纤维素
法拉第效率
纤维素
碳纳米纤维
氧化还原
纳米纤维
硫黄
化学
碳纤维
碳化
无机化学
材料科学
吸附
化学工程
电解质
电极
纳米技术
锂(药物)
有机化学
碳纳米管
复合材料
内分泌学
物理化学
工程类
复合数
医学
作者
Shuhui Wang,Jinze Guo,Ruisong Guo,Xiaohong Sun,Fuyun Li,Tingting Li,Xiaojing Zhao,Yani Luo
出处
期刊:Journal of The Electrochemical Society
[The Electrochemical Society]
日期:2021-02-01
卷期号:168 (2): 020512-020512
被引量:8
标识
DOI:10.1149/1945-7111/abdeee
摘要
To address sluggish sulfur redox kinetic and the "shuttling behavior" of polysulfides in lithium-sulfur batteries (LSBs), CoS2 hollow nanospheres tightly anchored on three-dimensional (3D) N-doped biological carbon nanofibers skeleton (CoS2/N-CNFs) are successfully designed as highly-efficient sulfur hosts. The carbon nanofibers obtained by carbonization of bacterial cellulose are interweaved with each other, and can provide a firm 3D conductive skeleton for the low-conductive sulfur cathode. And the N-doping carbon nanofibers skeleton with polar CoS2 can achieve synergetic physical/chemical adsorption of polysulfides and effective catalytic conversion, which are contributed to enhance sulfur redox kinetic and effectively suppress the shuttling effect. Moreover, the skeleton with abundant −OH functional groups achieve strong chemisorption to CoS2, greatly maintaining structural stability during cycling process. Benefitting from the above-mentioned merits, CoS2/N-CNFs@S electrode with high sulfur loading of 74.4% exhibits superior reversible capacity of 497.3 mAh g−1 at 0.2 C after 100 cycles with an improved coulombic efficiency of approximately 100%, and the electrode has excellent cycle life with 73% capacity retention over 300 cycles at 0.5 C. This synthesis strategy makes a leading exploration for the application of biological carbon materials in advanced LSBs.
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