Effect of Bi2O3 on the ion migration and interfacial properties of Li0.33La0.557TiO3 solid electrolytes

The poor interface incompatibility with Li anode and low ionic conductivity have hindered perovskite-type electrolyte’s practical application. In this work, solid electrolytes of Li0.33La0.557TiO3 + x wt% Bi2O3 for solid state batteries were prepared by solid-phase sintering method. The ionic conduc...

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Published in:Corrosion science 2023-11, Vol.224, p.111473, Article 111473
Main Authors: Wu, Zhongkai, Wu, Zhizheng, Wang, Zihao, Peng, Yilin, Li, Zijian, Huang, Zihao, Mei, Wencen, Liu, Dingbang, Li, Mingyang, Zhou, Weiping, Gao, Fei, Cheng, Zhenzhi, Luo, Guangshen
Format: Article
Language:English
Subjects:
Critical current density
Cycling stability
Electrochemical properties
Ionic conductivity
Li0.33La0.557TiO3
Solid-state electrolyte
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Summary:The poor interface incompatibility with Li anode and low ionic conductivity have hindered perovskite-type electrolyte’s practical application. In this work, solid electrolytes of Li0.33La0.557TiO3 + x wt% Bi2O3 for solid state batteries were prepared by solid-phase sintering method. The ionic conductivity of LLTO reaches a maximum of 2.71 × 10–5 S·cm–1 at 1 wt% Bi2O3 doping. The critical current density of Li0.33La0.557TiO3 + 1 wt%Bi2O3 can reach 0.16 mA and still operate normally after 300 h of cycling. Li0.33La0.557TiO3 + 1 wt% Bi2O3 solid-state battery displays a high initial discharge capacity of 133.1 mAh/g and capacity retention of 98.0% after 40 cycles. •The ionic conductivity of LLTO reaches a maximum of 2.71 × 10–5 S·cm–1 at 1 wt% Bi2O3 doping.•The relationship between the phase composition and electrochemical properties was investigated.•Li0.33La0.557TiO3 + 1 wt% Bi2O3 solid-state battery displays a high discharge capacity and superior cyclability.
ISSN:0010-938X
1879-0496
DOI:10.1016/j.corsci.2023.111473