中国物理B ›› 2016, Vol. 25 ›› Issue (7): 78204-078204.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), 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)   

  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
  • 收稿日期:2016-04-13 修回日期:2016-04-20 出版日期:2016-07-05 发布日期:2016-07-05
  • 通讯作者: Hong Li E-mail:hli@iphy.ac.cn
  • 基金资助:

    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).

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. 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
  • Received:2016-04-13 Revised:2016-04-20 Online:2016-07-05 Published:2016-07-05
  • Contact: Hong Li E-mail:hli@iphy.ac.cn
  • Supported by:

    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).

摘要:

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.

关键词: solid state lithium batteries, solid electrolyte interphase, ionic conductor coated separator, lithium dendrite

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.

Key words: solid state lithium batteries, solid electrolyte interphase, ionic conductor coated separator, lithium dendrite

中图分类号:  (Lithium-ion batteries)

  • 82.47.Aa
65.40.gk (Electrochemical properties) 82.45.Fk (Electrodes)