期刊
CHEMISTRY OF MATERIALS
卷 32, 期 9, 页码 3765-3775出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.chemmater.9b05027
关键词
-
资金
- DOE through the EFRC (NEES-II)
- Nanostructures for Electrical Energy Storage (NEES), an Energy Frontier Research Center - U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences [DESC0001160]
- U.S. Department of Energy's National Nuclear Security Administration [DE-NA0003525]
We report the formation mechanism and compositions of a solid-electrolyte interphase (SEI) on a microporous carbon/sulfur (MC/S) cathode in Li-S batteries using a carbonate-based electrolyte (1 M LiPF6 in ethylene carbonate (EC)/dimethyl carbonate, v:v = 1:1). Through characterizations using 1D and 2D solution-phase nuclear magnetic resonance spectroscopy, coupled with model chemical reactions and DFT calculations, we have identified two critical roles of Li+ in steering the SEI formation. First, the preferential solvation of Li+ by EC in the mixed carbonate electrolyte renders EC as the dominant participant in the SEI formation, and second, Li+ coordination to the EC carbonyl alters activation barriers and changes the reaction pathways relative to Na+. The main organic components in the SEI are identified as lithium ethylene monocarbonate and lithium methyl carbonate, which are virtually identical to those formed on Li and graphite anodes of lithium-ion batteries but via a different pathway.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据