期刊
ADVANCED ENERGY MATERIALS
卷 12, 期 9, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/aenm.202102805
关键词
accelerated conversion; density functional theory; heterostructures; lithium-sulfur batteries; metal-organic frameworks
类别
资金
- Regional Leading Research Center Program through the National Research Foundation (NRF) - Ministry of Science and ICT [2019R1A5A8080326]
- Innovation Research Center for Next Generation Battery-based Materials, Parts and Applied Technology through the Korea Institute of Energy Technology Evaluation and Planning (KETEP) - Ministry of Trade, Industry and Energy (MOTIE) of Republic of Korea [20214000000040]
- Korea Institute of Energy Technology Evaluation & Planning (KETEP) [20214000000040] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
This study enhances the adsorption ability and reaction rate of high order lithium polysulfides in lithium-sulfur batteries by designing a heterostructure, leading to excellent rate performance and long-term stability.
Rechargeable lithium-sulfur batteries (LSBs) are recognized as a promising candidate for next-generation energy storage devices because of their high theoretical specific capacity and energy density. However, the insulating of sulfur, Li2S2/Li2S, and the shuttling effect of high order lithium polysulfides (LiPSs) hinder its practical applications. Herein, a heterostructure is explored to enhance the conversion reaction kinetics and adsorption ability of LiPSs. By rationally designing a conductive carbon framework and polar metal sites, both experimental and theoretical results show strong adsorption abilities for dissolved LiPSs and promote the conversion reaction rate. A CoSe2/Co3O4@NC-CNT/S cathode shows an excellent rate performance (approximate to 1457 mAh g(-1) at 0.1 C and still retains approximate to 688 mAh g(-1) at a high rate of 5 C). When performing charge-discharge in long-term stability at 2 C, the CoSe2/Co3O4@NC-CNT/S cathode delivers a high initial specific capacity of approximate to 780 mAh g(-1) and retains approximate to 602 mAh g(-1) after 500 cycles with an excellent Coulombic efficiency of approximate to 95.4%. Remarkably, the battery can entirely operate even at a very high sulfur loading of approximate to 10.1 mg cm(-2) and lean electrolyte condition. This work emphasizes a new strategy to rationally design heterostructures that can encourage the industrial application of LSBs.
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