材料科学
电化学
化学工程
阴极
碳纳米管
复合数
电解质
阳极
电极
电池(电)
法拉第效率
循环伏安法
介电谱
锂(药物)
石墨烯
碳纤维
扫描电子显微镜
纳米复合材料
拉曼光谱
作者
Fengshuai Zhu,Mingang Zhang,Ling Wang,Xiangyu Cao
标识
DOI:10.1007/s10008-021-05033-6
摘要
The shuttle effect of lithium-sulfur (Li–S) battery is one of the crucial factors restraining its commercial application, because LiPSs (lithium polysulfides) usually leads to poor cycle life and low coulomb efficiency. Some studies have shown that metal oxides can adsorb soluble polysulfides. Herein, CeO2 (cerium-oxide)-doped carbon nanotubes (CeO2@CNTs) were prepared by the hydrothermal method. The polar metal oxide CeO2 enhanced the chemisorption of the cathode to LiPSs and promoted the redox reaction of the cathode through catalysis properties. Meanwhile, the carbon nanotubes (CNTs) enhanced cathode conductivity and achieved more sulfur loading. The strategy could alleviate polysulfide shuttling and accelerate redox kinetics, improving Li–S batteries' electrochemical performances. As a result, the CeO2@CNTs/S composite cathode showed the excellent capacity of 1437.6 mAh g−1 in the current density of 167.5 mA g−1 at 0.1 C, as well as a long-term cyclability with an inferior capacity decay of 0.17% per cycle and a superhigh coulombic efficiency of 100.434% within 300 cycles. The superior electrochemical performance was attributed to the polar adsorption of CeO2 on polysulfides and the excellent conductivity of CNTs.
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