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Low temperature synthesis of Li0.33La0.55TiO3 solid electrolyte with Al3+ doping by a modified Pechini method

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Abstract

By modifying the preparation process of Pechini method, we can improve the structure of Li0.33La0.55TiO3 (LLTO) crystalline powder, so as to obtain high-density LLTO solid electrolyte. Through optimizing the sintering process, LLTO powder with good dispersion and uniform particle size was calcined at 800 °C; afterwards, the LLTO solid electrolyte samples with excellent properties were prepared by sintering at 1250 °C. The LLTO samples showed a low activation energy of 0.32 eV, a high relative density of 91.2%, and a high ionic conductivity of 2.7 × 10−5 S/cm. By adding three different aluminum salts, the ionic conductivity of Al3+-doped LLTO (A-LLTO) was further improved significantly. Especially in this case, with 30-nm Al2O3 doped, the conductivity of A-LLTO was increased to 4.7 × 10−5 S/cm, the activation energy was reduced to 0.30 eV, and the relative density was increased to 92.8%.

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Funding

This work was financially supported by the Ministry of Science and Technology of China (MOST) (Grant No. 2013CB934700), Sichuan Science and Technology Program (Grant No. 2020YFH0047), and the Fundamental Research Funds for Central Universities.

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  1. College of Materials Science and Engineering, Sichuan University, Chengdu, 610064, China

    Yi Huang, Liu He & Xiaohong Zhu

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Huang, Y., He, L. & Zhu, X. Low temperature synthesis of Li0.33La0.55TiO3 solid electrolyte with Al3+ doping by a modified Pechini method. Ionics 28, 1739–1751 (2022). https://doi.org/10.1007/s11581-021-04422-1

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