Performance of perovskite-type Li-ion solid electrolyte Li2x?ySr1?xTi1?yNbyO3

LU Jia-yao; LI Ying; NI Pei-yuan; TANG Tian-tian

doi:10.13374/j.issn2095-9389.2020.12.03.004

Volume 43 Issue 8

Aug. 2021

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LU Jia-yao, LI Ying, NI Pei-yuan, TANG Tian-tian. Performance of perovskite-type Li-ion solid electrolyte Li2x?ySr1?xTi1?yNbyO3[J]. Chinese Journal of Engineering, 2021, 43(8): 1024-1031. doi: 10.13374/j.issn2095-9389.2020.12.03.004

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LU Jia-yao, LI Ying, NI Pei-yuan, TANG Tian-tian. Performance of perovskite-type Li-ion solid electrolyte Li₂_x_?_ySr_1?_xTi_1?_yNb_yO₃[J]. Chinese Journal of Engineering, 2021, 43(8): 1024-1031. doi: 10.13374/j.issn2095-9389.2020.12.03.004

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Performance of perovskite-type Li-ion solid electrolyte Li₂_x_?_ySr_1?_xTi_1?_yNb_yO₃

doi: 10.13374/j.issn2095-9389.2020.12.03.004

LU Jia-yao^{1, 2},
LI Ying^{1, 2
,
,},
NI Pei-yuan^{1, 2},
TANG Tian-tian^{1, 2}

1.
School of Metallurgy, Northeastern University, Shenyang 110819, China
2.
Key Laboratory for Metallurgical Sensor Materials and Technology (Liaoning Province), Shenyang 110819, China

More Information

Corresponding author: E-mail: liying@mail.neu.edu.cn
Received Date: 2020-12-03
Available Online: 2021-03-27
Publish Date: 2021-08-25

Abstract

Abstract

All-solid-state lithium batteries are recognized as the next-generation energy storage batteries due to their high energy density and high security, to which researchers have paid more attention. All-solid-state lithium batteries are composed of solid materials, and the Li-ion solid electrolytes do not contain flammable and explosive organic solvents, which can enhance the safety of the battery. As important components, Li-ion solid electrolytes are widely studied in all-solid-state lithium batteries, which currently include Li-superionic solid electrolyte (LISICON), Na-superionic solid electrolyte (NASICON), garnet-type solid electrolyte, perovskite-type solid electrolyte, sulfide-type solid electrolyte, and polymer solid electrolyte. Li-ion solid electrolytes generally have the advantages of high Li-ion conductivity, low electronic conductivity, wide operating temperatures, wide electrochemical windows, and inhibition of lithium dendrite growth. Among the solid electrolytes, the perovskite-type solid electrolytes have a wide tolerance factor that allows most elements to dope into the ABO₃ structure. Additionally, the perovskite-type Li-ion solid electrolytes are summarized into two types: (1) the three-component Li₃_xLa_2/3?_xTiO₃ (LLTO, 0 < x < 1/6) and (2) the four-component (Li, Sr)(A, B)O₃ (A = Zr, Hf, Ti, Sn; B = Nb, Ta). In this paper, the four-component Li₂_x_?_ySr_1?_xTi_1?_yNbyO₃ (x = 3y/4, y = 0.25, 0.5, 0.6, 0.7, 0.75, 0.8) solid electrolytes were prepared by conventional solid-state reaction method. X-ray diffraction (XRD), scanning electron microscopy, alternating current impedance, and potentiostatic polarization methods were adopted to study the crystal structure, micromorphology, ion conductivity, and electronic conductivity, respectively. XRD analysis show the synthesized samples exhibit a cubic perovskite structure when y≤0.70 with almost no impurity phase formed. Li_0.35Sr_0.475Ti_0.3Nb_0.7O₃ exhibits the highest ion conductivity of 3.62×10^?5 S·cm^?1, electronic conductivity of 2.55×10^?9 S·cm^?1 at 20 ℃, and activation energy of only 0.29 eV. The LiFePO₄/Li half-cell was fabricated using Li_0.35Sr_0.475Ti_0.3Nb_0.7O₃ as a separator, exhibiting a capacity of 93.9 mA·h·g^?1 and a retention capacity of 90.72% after 100 cycles.
- perovskite,
- Li-ion solid electrolyte,
- AC impedance,
- electronic conductivity,
- lithium battery

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References(25)

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