期刊
ADVANCED ENERGY MATERIALS
卷 10, 期 27, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/aenm.202001456
关键词
disproportionation; high donor electrolytes; lithium-metal anodes; lithium-sulfur batteries; polysulfides; shuttling effects; sulfur radical
类别
资金
- National Research Foundation of Korea grant [NRF-2018R1A2A1A19023146, NRF-2018M1A2A2063340, NRF-2017M1A2A2044504]
- Institute of Engineering Research (IER) at Seoul National University
- U.S. Department of Energy, Office of Basic Energy Sciences, Division of Materials Science and Engineering [DE-SC0005397]
Lithium-sulfur (Li-S) batteries continue to be considered promising post-lithium-ion batteries owing to their high theoretical energy density. In pursuit of a Li-S cell with long-term cyclability, most studies thus far have relied on using ether-based electrolytes. However, their limited ability to dissolve polysulfides requires a high electrolyte-to-sulfur ratio, which impairs the achievable specific energy. Recently, the battery community found high donor electrolytes to be a potential solution to this shortcoming because their high solubility toward polysulfides enables a cell to operate under lean electrolyte conditions. Despite the increasing number of promising outcomes with high donor electrolytes, a critical hurdle related to stability of the lithium-metal counter electrode needs to be overcome. This review provides an overview of recent efforts pertaining to high donor electrolytes in Li-S batteries and is intended to raise interest from within the community. Furthermore, based on analogous efforts in the lithium-air battery field, strategies for protecting the lithium metal electrode are proposed. It is predicted that high donor electrolytes will be elevated to a higher status in the field of Li-S batteries, with the hope that either existing or upcoming strategies will, to a fair extent, mitigate the degradation of the lithium-metal interface.
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