多硫化物
杂原子
化学
电化学
化学工程
硫黄
锂(药物)
催化作用
碳纤维
吸附
电极
无机化学
纳米技术
材料科学
有机化学
电解质
复合材料
医学
戒指(化学)
物理化学
复合数
工程类
内分泌学
作者
Yan Song,Jia Wang,Xiuyuan Li,Chenxu Zhao,Jinrong Huo,Chaozheng He
标识
DOI:10.1016/j.jcis.2021.10.015
摘要
The practical applications of lithium sulfur battery is impeded by the lithium polysulfide shuttling and sluggish redox kinetics. To address the issues, herein, a multifunctional host is developed by the combination of nitrogen, phosphorus co-doped carbon fiber (NPCF) and CoS2 towards boost the soluble polysulfides adsorption and transformation. Benefiting from the NPCF originated from biomass cattail fibers, a high conductive network is provided, and shuttle effect is reduced due to the strong chemical interaction between abundant heteroatom polar sites and lithium polysulfides. Moreover, the electrocatalytic CoS2 on the carbon skeleton facilitate lithium polysulfides conversion and lithium sulfide deposition based on the density functional theory calculations and experiments. The efficient lithium polysulfides entrapment and subsequent electrocatalytic conversion improve dynamic stability during cycling, especially for rate capability. With these advantageous features, the electrode with NPCF/CoS2 host can deliver a good rate capability (903 and 782 mAh g-1 at 1C and 2C, respectively) and stable cycling performance with an ultra-low capacity decay of 0.014% per cycle at 1C. Notably, the cell can achieve a high areal capacity of 4.96 mA h cm-2 under an elevated sulfur loading of 5.0 mg cm-2. Overall, the improvement on the electrochemical performance ascertains the validity of the design strategy based on synergy engineering, which is a highly suitable approach for energy storage and conversion application.
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