多硫化物
材料科学
石墨烯
过电位
硫化物
阴极
极化(电化学)
硫黄
氧化物
电化学
化学工程
锂硫电池
无机化学
纳米技术
电极
电解质
化学
冶金
物理化学
工程类
作者
Peng Hu,Yinggan Zhang,Yanli Chen,Jie Zhang,Heng Jiang,Xin Chen,Zhigang Zhang,Yibo Zeng,Baisheng Sa,Qiulong Wei,Jie Lin,Hang Guo
标识
DOI:10.1016/j.mtener.2020.100519
摘要
Polarization of lithium-sulfur (Li-S) batteries consumes energy density upon cycling, which precludes their practical application in state-of-the-art devices. Herein a conformal zinc sulfide/reduced graphene oxide/elemental sulfur (ZnS/rGO/S) composite is synthesized and used as cathode materials in Li-S batteries. The synergetic regulation of ohmic, concentration, and electrochemical polarization decreases the overpotential and improves the cycling performance of the Li||ZnS/rGO/S cell. Combining theoretical calculations and experimental results, it is revealed that the ZnS spheres can absorb lithium polysulfide (LPS) intermediates, catalyze LPS conversion, and provide fast electronic/ionic diffusion kinetics. The ZnS/rGO/S cathode is further applied in pouch Li-S cells, demonstrating the practicability of sulfur cathodes with reduced polarization.
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