期刊
NANO LETTERS
卷 20, 期 3, 页码 2080-2086出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.0c00058
关键词
lithium sulfur cells; lithium polysulfides; ionic liquid; in situ transmission electron microscopy; graphene liquid cell
类别
资金
- Nano.Material Technology Development Program through the National Research Foundation of Korea (NRF) - Ministry of Science, ICT and Future Planning [2009-0082580]
- National Research Foundation of Korea (NRF) - Korean government (MSIP
- Ministry of Science, ICT & Future Planning) [NRF-2018R1C1B6002624, NRF-2018M3A7B4065625]
- Office of Science, Office of Basic Energy Sciences, of the U.S. Department of Energy [DE-AC02-05CH11231]
- KAIST
Understanding of lithium polysulfide (Li-PS) formation and the shuttle phenomenon is essential for practical application of the lithium/sulfur (Li/S) cell, which has superior theoretical specific energy (2600 Wh/kg). However, it suffers from the lack of direct observation on behaviors of soluble Li-PS in liquid electrolytes. Using in situ graphene liquid cell electron microscopy, we have visualized formation and diffusion of Li-PS simultaneous with morphological and phase evolutions of sulfur nanoparticles during lithiation. We found that the morphological changes and Li-PS diffusion are retarded by ionic liquid (IL) addition into electrolyte. Chronoamperometric shuttle current measurement confirms that IL addition lowers the experimental diffusion coefficient of Li-PS by 2 orders of magnitude relative to that in IL-free electrolyte and thus suppresses the Li-PS shuttle current, which accounts for better cyclability and Coulombic efficiency of the Li/S cell. This study provides significant insights into electrolyte design to inhibit the polysulfide shuttle phenomenon.
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