法拉第效率
双功能
多硫化物
锂(药物)
材料科学
化学工程
阳极
碳纤维
化学
催化作用
无机化学
电极
复合材料
有机化学
复合数
电解质
物理化学
医学
工程类
内分泌学
作者
Hongbin Zhao,Tingting Gu,Yang Zheng,ZuZe Li,Xueran Shen,Qingze Jiao,Yun Zhao,Hansheng Li,Yaoyuan Zhang,Caihong Feng
标识
DOI:10.1016/j.jallcom.2023.170171
摘要
Lithium-sulfur (Li-S) batteries have drawn much research attention as a contender for next-generation energy conversion systems because of their high capacity density and abundant raw materials. The large volume expansion and the insulating nature of sulfur and polysulfide shuttling issues limit future Li-S battery development. Herein, MOF-derived CoN nanoparticles embedded in an N-doped carbon layer are successfully constructed on the surface of the Co3S4 hollow sphere to form the Co3S4-CoN@NC heterostructure with strong S-Co-N bonds, which act as bifunctional host materials for Li-S batteries and show excellent adsorption and high-efficiency catalysis for lithium polysulfide (LiPSs). The hollow structure pre-stores a buffer space for the volume change of the electrode, limiting polysulfide dissolution. Furthermore, the carbon layer can improve the material's overall structural strength and electrical conductivity. Co3S4-CoN heterostructure with strong S-Co-N bonds can adsorb and accelerate the catalytic conversion of LiPSs. Co3S4-CoN@NC exhibits a high initial specific capacity of 1542.0 mAh g−1 at 0.1 C and a stable capacity of 872.6 mAh g−1 at 0.5 C after 100 cycles with a high Coulombic efficiency of nearly 100 %.
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