Journal
NANO LETTERS
Volume 21, Issue 20, Pages 8579-8586Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.1c02037
Keywords
metal-organic frameworks; metal selenide; sulfur cathode; lithium polysulfides; Li-S batteries
Categories
Funding
- Award Program for Fujian Minjiang Scholar Professorship, National Natural Science Foundation of China [11704071]
- Excellent Youth Foundation of Fujian Scientific Committee [2019J06008]
- Fujian Science and Technology Innovation Laboratory for Optoelectronic Information of China [2021ZR146]
- Fujian Provincial Department of Industry and Information Technology of China [82318075]
- National Natural Science Foundation of China [51902265]
- Key Research and Development Program of Shaanxi [2020KWZ-001]
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A novel design strategy utilizing Co0.85Se nanoparticles embedded in nitrogen-doped carbon nanosheet arrays on carbon cloth as a self-supported host for a sulfur cathode is introduced in the article. This design can effectively improve the cycle performance and discharge specific capacity of lithium-sulfur batteries.
Lithium-sulfur batteries possess the merits of low cost and high theoretical energy density but suffer from the shuttle effect of lithium polysulfides and slow redox kinetics of sulfur. Herein, novel Co0.85Se nanoparticles embedded in nitrogen-doped carbon nanosheet arrays (Co0.85Se/NC) were constructed on carbon cloth as the self-supported host for a sulfur cathode using a facile fabrication strategy. The interconnected porous carbonbased structure of the Co0.85Se/NC could facilitate the rapid electron and ion transfer kinetics. The embedded Co0.85Se nanoparticles can effectively capture and catalyze lithium polysulfides, thus accelerating the redox kinetics and stabilizing sulfur cathodes. Therefore, the Co0.85Se/NC-S cathode could maintain a stable cycle performance for 400 cycles at 1C and deliver a high discharge specific capacity of 1361, 1001, and 810 mAh g(-1) at current densities of 0.1, 1, and 3C, respectively. This work provides an efficient design strategy for high-performance lithium-sulfur batteries with high energy densities.
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