材料科学
锂(药物)
硫黄
化学工程
杂原子
阴极
锂硫电池
溶解
储能
化学
聚氨酯
电解质
电极
聚合物
纳米技术
复合材料
有机化学
戒指(化学)
功率(物理)
物理化学
内分泌学
工程类
物理
医学
量子力学
作者
Zhenfeng Li,Yu Lu,Pingping Chen,Qinghui Zeng,Xin Wen,Wen Wen,Yu Liu,Anqi Chen,Zengxi Li,Zhixiang Wang,Liaoyun Zhang
标识
DOI:10.1016/j.electacta.2021.139130
摘要
Lithium-sulfur (Li-S) batteries have attracted a lot of attention because of their high energy density, low cost, and environmental friendliness. However, shuttle effect is one of the most obstacles to make the poor cycling performance and inhibit the development of Li-S batteries. Herein, a kind of large oxygen-containing polymer coated cathode, named polyurethane coated carbon-nanotube/sulfur composites ([email protected]), is prepared from sulfur capsulated by the reaction of hyperbranched polyether and diisocyanate via a simple “one-pot” strategy to impede the shuttle effect. This [email protected] cathode can not only inhibit the dissolution of lithium polysulfides by physical barrier, but also can absorb the lithium polysulfides by the chemical effect. Especially, the cell with [email protected] electrode shows an excellent initial cycling capacity of 892 mAh g−1 at 2C and remarkable capacity retention (a low decay rate of 0.051% per cycle at 2C after 450 cycles). More importantly, this coated cathode ([email protected]) demonstrates a good inhibition of shuttle effect, high transmission speed of lithium ion and good cycle reversibility. This work exhibits the cross-linked hyperbranched polyurethane is used as coatings of the sulfur cathode for the first time, which can reveal a potential prospect of high-level heteroatom doped coated cathodes for high-performance lithium-sulfur batteries.
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