Journal
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
Volume 139, Issue 29, Pages 10133-10141Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jacs.7b05371
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Funding
- NRF-CRP Novel 2-D Materials with Tailored Properties: Beyond Graphene [R-143-000-295-281]
- U.S. Department of Energy (DOE), Office of Science, Basic Energy Science, Materials Sciences and Engineering Division
- ORNL's Center for Nanophase Materials Sciences (CNMS), a DOE Office of Science User Facility
- Guangdong Dynavolt Renewable Energy Technology Co Ltd.
- Basic Science Research Program through the National Research Foundation of Korea - Ministry of Education [2016R1C1B2013935]
- Specialized Research Fund for the Doctoral Program of Higher Education of China [NRF-20131102120001]
- program for New Century Excellent Talents in University [NCET-12-0033]
- National Research Foundation of Korea [2016R1C1B2013935] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Sulfur is an attractive cathode material for next-generation lithium batteries due to its high theoretical capacity and low cost. However, dissolution of its lithiated product (lithium polysulfides) into the electrolyte limits the practical application of lithium sulfur batteries. Here we demonstrate that sulfur particles can be hermetically encapsulated by leveraging on the unique properties of two-dimensional materials such as molybdenum disulfide (MoS2). The high flexibility and strong van der Waals force in MoS2 nanoflakes allows effective encapsulation of the sulfur particles and prevent its sublimation during in situ TEM studies. We observe that the lithium diffusivities in the encapsulated sulfur particles are in the order of 10(-17) m(2) Composite electrodes made from the MoS2-encapsulated sulfur spheres show outstanding electrochemical performance, with an initial capacity of 1660 mAh g(-1) and long cycle life of more than 1000 cycles.
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