期刊
ENERGY & ENVIRONMENTAL SCIENCE
卷 7, 期 10, 页码 3381-3390出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c4ee01377h
关键词
-
资金
- Assistant Secretary for Energy Efficiency and Renewable Energy, Office of Vehicle Technologies of the U.S. Department of Energy
Lithium-sulfur (Li-S) batteries are highly attractive for future generations of portable electronics and electric vehicles due to their high energy density and potentially tow cost. In the past decades, various novel electrodes and electrolytes have been tested to improve Li-S battery performance. However, these designs on electrodes and electrolytes have not fully addressed the problem of low cycling stability of Li-S batteries. Here, we show the role of the separator in the capacity decay of the Li-S battery, namely that it can accommodate a large amount of polysulfides inside which then precipitates as a thick layer of inactive S-related species. Using a thin conductive coating on the separator to prevent the formation of the inactive S-related species layer, we show that the specific capacity and cycling stability of the Li-S battery are both improved significantly compared to the battery with a pristine separator. Combining this separator design with a monodisperse sulfur nanoparticle cathode, we show Li-S batteries with a life of over 500 cycles with an initial specific capacity of 1350 mA h g(-1) at C/2 and a cycle decay as low as 0.09% per cycle.
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