期刊
ADVANCED MATERIALS
卷 32, 期 32, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.202002168
关键词
CoSe; electrocatalysts; hierarchical porous polyhedra; lithium-sulfur batteries; polysulfides conversion
类别
资金
- National Key Research and Development Program of China New Energy Project for Electric Vehicle [2016YFB0100204]
- National Natural Science Foundation of China [51772030]
- Beijing Outstanding Young Scientists Program [BJJWZYJH01201910007023]
Lithium-sulfur (Li-S) batteries are recognized as promising candidates for next-generation electrochemical energy storage systems owing to their high energy density and cost-effective raw materials. However, the sluggish multielectron sulfur redox reactions are the root cause of most of the issues for Li-S batteries. Herein, a high-efficiency CoSe electrocatalyst with hierarchical porous nanopolyhedron architecture (CS@HPP) derived from a metal-organic framework is presented as the sulfur host for Li-S batteries. The CS@HPP with high crystal quality and abundant reaction active sites can catalytically accelerate capture/diffusion of polysulfides and precipitation/decomposition of Li2S. Thus, the CS@HPP sulfur cathode exhibits an excellent capacity of 1634.9 mAh g(-1), high rate performance, and a long cycle life with a low capacity decay of 0.04% per cycle over 1200 cycles. CoSe nanopolyhedrons are further fabricated on a carbon cloth framework (CC@CS@HPP) to unfold the electrocatalytic activity by its high electrical conductivity and large surface area. A freestanding CC@CS@HPP sulfur cathode with sulfur loading of 8.1 mg cm(-2)delivers a high areal capacity of 8.1 mAh cm(-2)under a lean electrolyte. This work will enlighten the rational design of structure-catalysis engineering of transition-metal-based nanomaterials for diverse applications.
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