Journal of Jilin University(Engineering and Technology Edition) ›› 2023, Vol. 53 ›› Issue (8): 2272-2276.doi: 10.13229/j.cnki.jdxbgxb.20211048

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Preparation of cubic Li7La3Zr2O12 solid electrolyte by fast hot⁃press sintering

Yue YANG(),Tian-hui MA,Pei-lei ZHAO,Jian-ming JIA   

  1. School of Materials Science and Engineering，Changchun University of Technology，Changchun 130012，China
  • Received:2021-10-12 Online:2023-08-01 Published:2023-08-21

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Abstract:

In this paper， a garnet-type Li7La3Zr2O12 powder was synthesized through the solid-phase reaction route， an electric field-assisted fast hot-press sintering process was used to prepare a cubic phase lithium ion conductive Li7La3Zr2O12 solid electrolyte at a low temperature of 850 ℃， and the influence of sintering temperature on phase composition， microscopic morphology， density and lithium ion conductivity was systematically studied in the range of 820~900 ℃. The results show that when the sintering process conditions are set to a low temperature of 850 ℃， a constant pressure of 25 MPa， and a holding time of 15 minutes， a pure cubic Li7La3Zr2O12 structure can be obtained， the crystal grains are arranged tightly， the measured relative density is 93%， and the total ion conductivity has reached 1.14×10-4 S cm-1.

Key words: materials science, solid electrolyte, fast hot-press sintering, sintering temperature, ion conductivity

CLC Number: 

  • TB34

Fig.1

Flow chart of preparation of LLZO Pre-calcined powder by solid-state reaction method"

Fig.2

Sintering behavior and mechanism of Li7La3Zr2O12 specimen"

Fig.3

XRD patterns of Li7La3Zr2O12 specimens sintered at different temperatures"

Fig.4

Scanning electron microscopy micrographs and relative density changes of sintered samples at different temperatures"

Table 1

Room temperature ionic conductivity and relative density of LLZO at various sintering temperatures"

烧结温度/℃离子电导率/（S?cm-1）相对密度/%
8206.60×10-582
8501.14×10-493
9007.56×10-590

Fig.5

Typical electrochemical impedance spectra of LLZO sintered at different temperatures"

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