期刊
ADVANCED SCIENCE
卷 5, 期 7, 页码 -出版社
WILEY
DOI: 10.1002/advs.201800139
关键词
concentrated electrolytes; graphite/Li2S batteries; holey structures; Li2S cathodes; Li2S utilization
资金
- KAIST Institute for the NanoCentury
- Korea Institute of Science and Technology (KIST) Institutional Program [2E26291]
- National Research Foundation of Korea [NRF-2016M1B3A1A01937431]
The pairing of high-capacity Li2S cathode (1166 mAh g(-1)) and lithium-free anode (LFA) provides an unparalleled potential in developing safe and energy-dense next-generation secondary batteries. However, the low utilization of the Li2S cathode and the lack of electrolytes compatible to both electrodes are impeding the development. Here, a novel graphite/Li2S battery system, which features a self-assembled, holey-Li2S nanoarchitecture and a stable solid electrolyte interface (SEI) on the graphite electrode, is reported. The holey structure on Li2S is beneficial in decomposing Li2S at the first charging process due to the enhanced Li ion extraction and transfer from the Li2S to the electrolyte. In addition, the concentrated dioxolane (DOL)-rich electrolyte designed lowers the irreversible capacity loss for SEI formation. By using the combined strategies, the graphite/holey-Li2S battery delivers an ultrahigh discharge capacity of 810 mAh g(-1) at 0.1 C (based on the mass of Li2S) and of 714 mAh g(-1) at 0.2 C. Moreover, it exhibits a reversible capacity of 300 mAh g(-1) after a record lifecycle of 600 cycles at 1 C. These results suggest the great potential of the designed LFA/holey-Li2S batteries for practical use.
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