期刊
CHINESE PHYSICS B
卷 25, 期 7, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/1674-1056/25/7/078204
关键词
solid state lithium batteries; solid electrolyte interphase; ionic conductor coated separator; lithium dendrite
资金
- Beijing Science and Technology Project, China [Z13111000340000]
- National Basic Research Program of China [2012CB932900]
- National Natural Science Foundation of China [51325206, 51421002]
A new concept of forming solid electrolyte interphases (SEI) in situ in an ionic conducting Li1.5Al0.5Ge1.5(PO4)(3)-polypropylene (LAGP-PP) based separator during charging and discharging is proposed and demonstrated. This unique structure shows a high ionic conductivity, low interface resistance with electrode, and can suppress the growth of lithium dendrite. The features of forming the SEI in situ are investigated by scanning electron microscopy (SEM) and x-ray photoelectron spectroscopy (XPS). The results confirm that SEI films mainly consist of lithium fluoride and carbonates with various alkyl contents. The cell assembled by using the LAGP-coated separator demonstrates a good cycling performance even at high charging rates, and the lithium dendrites were not observed on the lithium metal electrode. Therefore, the SEI-LAGP-PP separator can be used as a promising flexible solid electrolyte for solid state lithium batteries.
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