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

Previous Articles     Next Articles

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

PDF

496

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