Energy Storage Science and Technology ›› 2016, Vol. 5 ›› Issue (4): 462-468.doi: 10.12028/j.issn.2095-4239.2016.04.008

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Compounding preparation of novel solid electrolyte with high lithium ion conductivity

TAO Yicheng 1,2, CHEN Shaojie 2, CHEN Xiaotian 2, PENG Gang 2, LV Zhanpeng 1, XU Xiaoxiong 2   

  1. 1 School of Materials Science and Engineering, Shanghai University, Shanghai 200444, China; 2 Ningbo Institute of Industrial Technology, Chinese Academy of Sciences, Ningbo 315201, Zhejiang, China
  • Received:2016-02-01 Revised:2016-02-19 Online:2016-07-01 Published:2016-07-01

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Abstract:

(1-ω%)LPOS·ω%(t-LGPS)(ω=3, 5, 7, 10) are prepared by mixing the glass precursor of sulfide solid electrolyte 75Li2S·24P2S5·1P2O5 (LPOS) and Li10GeP2S12 (LGPS) precursor in different proportions and sintering the mixture at 270 ℃ for 4.5 hours. The prepared 95%LPOS·5%(t-LGPS) presents the highest conductivity of 1.0×10-3 S·cm-1 at room temperature. The prepared novel solid electrolyte was characterized systematically by XRD, EIS and SEM, et al., furthermore, the probable mechanism of the conductivity enhanced has been discussed. The all-solid-state cell with a structure of LiCoO2/95%LPOS·5%(t-LGPS)/Li shows a discharge capacity of 115.7 mA·h·g-1 at 0.1 C and high capacity retention 80.38% after 20 cycles at 25 ℃, which are better than these of the cell use the LPOS as electrolyte.

Key words: solid electrolyte, compound method, lithium ion conductivity, mechanism research, all-solid-state lithium cell