Forming solid electrolyte interphase in situ in an ionic conducting Li_(1.5)Al_(0.5)Ge_(1.5)(PO_4)_3-polypropylene(PP) based separator for Li-ion batteries

作     者：吴娇杨 凌仕刚 杨琪 李泓 许晓雄 陈立泉 Jiao-Yang Wu;Shi-Gang Ling;Qi Yang;Hong Li;Xiao-Xiong Xu;Li-Quan Chen

作者机构：Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences Ningbo Institute of Material Technology Engineering Chinese Academy of Sciences 

出 版 物：《Chinese Physics B》 (中国物理B（英文版）)

年 卷 期：2016年第25卷第7期

页      面：103-107页

核心收录：

学科分类：0808[工学-电气工程] 08[工学] 

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

主　　题：solid state lithium batteries solid electrolyte interphase ionic conductor coated separator lithium dendrite 

摘      要：A new concept of forming solid electrolyte interphases（SEI） in situ in an ionic conducting Li（1.5）Al（0.5）Ge（1.5）（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.