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    Phosphorus doping of 3D structural MoS2 to promote catalytic activity for lithium-sulfur batteries

    Year: 2022

    Journal: Chem. Eng. J., Volume 431, MAR 1

    Authors: Liu, Feiran; Wang, Ning; Shi, Chunsheng; Sha, Junwei; Ma, Liying; Liu, Enzuo; Zhao, Naiqin

    Organizations: National Natural Science Foundation of China [51772206]

    Keywords: Phosphorus doping; MoS2; 3D structure; Electrocatalysis; Lithium-sulfur battery

    To address the issues of shuttle effect of soluble polysulfides and sluggish redox kinetics in the cathodes of lithium-sulfur batteries, the acceleration of the polysulfides conversion via electrocatalysis is a promising solution. As a common electrocatalyst, the catalytic ability of two dimensional (2D) MoS2 is considerably diminished due to agglomeration of nanosheets and insufficient active sites. In this work, a phosphorus-doped three dimensional (3D) network of MoS2-based interlayer sandwiched between the S cathode and the separator is developed. The 3D network could prevent 2D nanosheets from stacking and provide fast diffusion channels for Li ions transfer. Phosphorus doped MoS2 forms stronger Mo-S and Li-P bonds to anchor polysulfides and to promote cleavage of S-S or Li-S bonds of lithium polysulfides to accelerate the polysulfides conversion. As a result, the cell exhibits a high specific capacity of 884.4 mAh g(-1) after 100 cycles at 0.1C even under the high sulfur loading condition (3.7 mg cm(-2)). This work may encourage more efforts on heteroatom doping in electrocatalyst to realize a high performance in lithium-sulfur batteries.
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