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Chin. Phys. B, 2016, Vol. 25(7): 078204    DOI: 10.1088/1674-1056/25/7/078204
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Forming solid electrolyte interphase in situ in an ionic conductingLi1.5Al0.5Ge1.5(PO4)3-polypropylene (PP) basedseparator for Li-ion batteries

Jiao-Yang Wu(吴娇杨)1, Shi-Gang Ling(凌仕刚)1, Qi Yang(杨琪)1, Hong Li(李泓)1, Xiao-Xiong Xu(许晓雄)2, Li-Quan Chen(陈立泉)1
1 Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;
2 Ningbo Institute of Material Technology Engineering, Chinese Academy of Sciences, Zhejiang 315201, China
Abstract  

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.

Keywords:  solid state lithium batteries      solid electrolyte interphase      ionic conductor coated separator      lithium dendrite  
Received:  13 April 2016      Revised:  20 April 2016      Published:  05 July 2016
PACS:  82.47.Aa (Lithium-ion batteries)  
  65.40.gk (Electrochemical properties)  
  82.45.Fk (Electrodes)  
Fund: 

Project supported by the Beijing Science and Technology Project, China (Grant No. Z13111000340000), the National Basic Research Program of China (Grant No. 2012CB932900), and the National Natural Science Foundation of China (Grant Nos. 51325206 and 51421002).

Corresponding Authors:  Hong Li     E-mail:  hli@iphy.ac.cn

Cite this article: 

Jiao-Yang Wu(吴娇杨), Shi-Gang Ling(凌仕刚), Qi Yang(杨琪), Hong Li(李泓), Xiao-Xiong Xu(许晓雄), Li-Quan Chen(陈立泉) Forming solid electrolyte interphase in situ in an ionic conductingLi1.5Al0.5Ge1.5(PO4)3-polypropylene (PP) basedseparator for Li-ion batteries 2016 Chin. Phys. B 25 078204

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