期刊
ACS APPLIED MATERIALS & INTERFACES
卷 8, 期 21, 页码 13437-13448出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.6b03200
关键词
lithium-sulfur; Li-S; rechargeable battery; high-rate; MoS2; molybdenum disulfide; inverse vulcanization; elemental sulfur
资金
- NSF [CHE-1305773]
- Kuraray
- University of Arizona Renewable Energy Network
- WCU Program through the NRF of Korea - Ministry of Education, Science and Technology [R31-10013]
- NRF for the National Creative Research Initiative Center for Intelligent Hybrids [2010-0018290]
- Institute for Basic Science, Republic of Korea [IBS-R006-G1]
- NIST [70NANB12H164]
- National Research Foundation of Korea [NRF-2015R1D1A1A01056874]
- Direct For Mathematical & Physical Scien
- Division Of Chemistry [1305773] Funding Source: National Science Foundation
The practical implementation of Li-S technology has been hindered by short cycle life and poor rate capability owing to deleterious effects resulting from the varied solubilities of different Li polysulfide redox products. Here, we report the preparation and utilization of composites with a sulfur-rich matrix and molybdenum disulfide (MoS2) particulate inclusions as Li-S cathode materials with the capability to mitigate the dissolution of the Li polysulfide redox products via the MoS2 inclusions acting as polysulfide anchors. In situ composite formation was completed via a facile, one-pot method with commercially available starting materials. The composites were afforded by first dispersing MoS2 directly in liquid elemental sulfur (S-8) with sequential polymerization of the sulfur phase via thermal ring opening polymerization or copolymerization via inverse vulcanization. For the practical utility of this system to be highlighted, it was demonstrated, that the composite formation methodology was amenable to larger scale processes with composites easily prepared in 100 g batches. Cathodes fabricated with the high sulfur content composites as the active material afforded Li-S cells that exhibited extended cycle lifetimes of up to 1000 cycles with low capacity decay (0.07% per cycle) and demonstrated exceptional rate capability with the delivery of reversible capacity up to 500 mAh/g at 5 C.
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