期刊
JOURNAL OF POWER SOURCES
卷 383, 期 -, 页码 150-156出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2018.02.026
关键词
Flexible interfaces; Si anodes; Composite electrolytes; Internal stress; Solid-state batteries
资金
- National Natural Science Foundation of China [51532002, 51771222]
- National Basic Research Program of China [2014CB921004]
- Strategic Priority Research Program of Chinese Academy of Science [XDA09010202]
- Natural Science Foundation of Shanghai [17ZR1434600]
Flexible interfaces between Si anodes and composite electrolytes consisting of poly(propylene carbonates) (PPCs) and garnets have been fabricated. The solid polymer electrolytes (SPEs) of PPC/garnet/LiTFSI show the conductivity of 4.2 x 10(-4) S cm(-1) at room temperature. Their combination with the Si layer anodes allows great alleviation of internal stress resulting from the large volume variation during lithiation and delithiation process of Si anodes. As a result, the Si/SPE/Li cells exhibit 2520 mAh g(-1), 2260 mAh g(-1), 1902 mAh g(-1), 1342 mAh g(-1) at 0.1 C, 0.2 C, 0.5 C, and 1 C, respectively. Furthermore, with such compatible and stable interfaces of Si/SPE and the LiFePO4 cathodes in solid-state batteries, the specific capacity of 2296 mAh g(-1) in terms of Si is obtained, which remains 82.6% after 100 cycles at room temperature and 0.1 C. The results here indicate that constructing of flexible interfaces between Si anodes and SPEs is a promising strategy to develop high performance solid-state batteries.
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