Electrical properties of garnet-like lithium ionic conductors Li5+<italic>x</italic>Sr<italic>x</italic>La3<bold>--</bold><italic>x</italic>Bi2O12 fabricated by spark plasma sintering method

doi:10.1007/s11706-012-0172-6

Front Mater Sci

2012, Vol. 6

Issue (3) : 216-224 https://doi.org/10.1007/s11706-012-0172-6

RESEARCH ARTICLE

Electrical properties of garnet-like lithium ionic conductors Li_5+xSr_xLa_3--xBi₂O₁₂ fabricated by spark plasma sintering method

Yun-Xia GAO, Xian-Ping WANG, Qin-Xing SUN, Zhong ZHUANG, Qian-Feng FANG(

)

Key Laboratory of Materials Physics, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031, China

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Abstract

A typical approach involving Pechini method and spark plasma sintering (SPS) method was presented for the preparation of high density Li_5+xSr_xLa_3--xBi₂O₁₂ (x = 0, 1) ceramics. Phase formation, microstructure, grain size and electrical properties of the specimens were examined using XRD, SEM and alternating current impedance spectroscopy (ACIS). Dense Li₅La₃Bi₂O₁₂ and Li₆SrLa₂Bi₂O₁₂ ceramics with pure garnet-like phase, relative density of 97% and average grain size of about 5 μm were fabricated using this approach. The total conductivities at 298 K of Li₅La₃Bi₂O₁₂ and Li₆SrLa₂Bi₂O₁₂ ceramics prepared by the SPS method are 5.1×10^-5 and 6.8×10^-5 S/cm, respectively, 2 times higher than that of samples prepared by the conventional sintering method.

Keywords lithium ionic conductor Li_5+xSr_xLa_3--xBi₂O₁₂ Pechini method spark plasma sintering (SPS) ionic conductivity

Corresponding Author(s): FANG Qian-Feng,Email:qffang@issp.ac.cn

Issue Date: 05 September 2012

Cite this article:

Yun-Xia GAO,Xian-Ping WANG,Qin-Xing SUN, et al. Electrical properties of garnet-like lithium ionic conductors Li_5+xSr_xLa_3--xBi₂O₁₂ fabricated by spark plasma sintering method[J]. Front Mater Sci, 2012, 6(3): 216-224.

URL:

https://academic.hep.com.cn/foms/EN/10.1007/s11706-012-0172-6
https://academic.hep.com.cn/foms/EN/Y2012/V6/I3/216

Fig.1 XRD patterns of LiSrLaBiO ( = 0, 1) powder samples (designated as P) calcined at 923 K for 5 h by the Pechini method and ceramic samples (designated as S) sintered at 923 K for 5 min by the SPS method using the sol–gel prepared powders. Arrows indicate impurity phase contribution of BiLaO.

Fig.2 Observed and calculated powder XRD patterns and their difference of LiLaBiO and LiSrLaBiO powders from pellets prepared by the SPS method.

Tab.1 The relative refinement parameters from powder XRD pattern matching for LiSrLaBiO ( = 0, 1) garnet-like phase

Fig.3 SEM images of pellets sintered at 923 K for 5 min by the SPS method: LiLaBiO (low magnification); LiLaBiO (high magnification); LiSrLaBiO (low magnification); LiSrLaBiO (high magnification).

Fig.4 EDS spectra of LiLaBiO and LiSrLaBiO specimens sintered at 923 K for 5 min by the SPS method, showing peaks for La, Bi, Sr and O.

Fig.5 Atom maps of LiLaBiO and LiSrLaBiO specimens sintered at 923 K for 5 min by the SPS method, showing the presence of elements La, Bi, Sr and O.

Fig.6 Impedance spectra collected at 298, 313, and 323 K for ceramic samples of LiLaBiO and LiSrLaBiO prepared by the SPS method. The fitting results of impedance spectra were collected at 298 K.

Fig.7 Relationships between ln() and 1/ involving the total conductivity and temperature of bulk LiLaBiO and LiSrLaBiO ceramic samples synthesized by the SPS method.

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