期刊
ACS NANO
卷 15, 期 7, 页码 11491-11500出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.1c01250
关键词
lithium-sulfur battery; shuttle effect; redox kinetics; heterointerface; Li2S deposition
类别
资金
- National Key Research and Development Program of China [2018YFE0124500]
- National Natural Science Foundation of China [51772164, 52022041]
- Shenzhen Basic Research Project [JCYJ20190813172807127, JCYJ2018-0508152037520]
In this study, a heterostructure catalyst with rich heterointerfaces was prepared by modifying Mo2N microbelt with SnO2 nanodots, effectively enhancing the performance of lithium-sulfur batteries to achieve high capacity and good cyclic stability.
The practical uses of lithium-sulfur batteries are greatly restricted by the sluggish reaction kinetics of lithium polysulfides (LiPSs), leading to low sulfur utilization and poor cyclic stability. Using the heterostructure catalysts is an effective way to solve the above problems, but how to further enhance the conversion efficiency and avoid the surface passivation by the insulative Li2S has not been well investigated. Herein, a heterostructure catalyst with rich heterointerfaces was prepared by modifying Mo2N microbelt with SnO2 nanodots. The formed rich interfaces with high accessibility act as the profitable nucleation sites guiding the Li2S 3D growth, which avoids the catalyst surface passivation and facilitates the LiPS conversion. The introduction of SnO2 nanodots also enhances the LiPS adsorption. Thus, the assembled battery with the above catalyst as the cathode additive shows a high capacity of 738.3 mAh g(-1) after 550 cycles at 0.5 C with an ultralow capacity decay of 0.025% per cycle. Even with high sulfur loading of 9.0 mg cm(-2), good cyclic stability is also achieved at 0.5 C with a low E/S ratio of 5 mu L mgs(-1). This work shows an effective way to enhance the LiPS conversion kinetics and guide Li2S deposition in Li-S batteries.
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