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钙钛矿型锂离子固体电解质Li2xySr1−xTi1−yNbyO3的性能

卢佳垚 厉英 倪培远 唐甜甜

卢佳垚, 厉英, 倪培远, 唐甜甜. 钙钛矿型锂离子固体电解质Li2x−ySr1−xTi1−yNbyO3的性能[J]. 工程科学学报, 2021, 43(8): 1024-1031. doi: 10.13374/j.issn2095-9389.2020.12.03.004
引用本文: 卢佳垚, 厉英, 倪培远, 唐甜甜. 钙钛矿型锂离子固体电解质Li2xySr1−xTi1−yNbyO3的性能[J]. 工程科学学报, 2021, 43(8): 1024-1031. doi: 10.13374/j.issn2095-9389.2020.12.03.004
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
Citation: LU Jia-yao, LI Ying, NI Pei-yuan, TANG Tian-tian. Performance of perovskite-type Li-ion solid electrolyte Li2xySr1−xTi1−yNbyO3[J]. Chinese Journal of Engineering, 2021, 43(8): 1024-1031. doi: 10.13374/j.issn2095-9389.2020.12.03.004

钙钛矿型锂离子固体电解质Li2xySr1−xTi1−yNbyO3的性能

doi: 10.13374/j.issn2095-9389.2020.12.03.004
基金项目: 国家自然科学基金资助项目(51834004,51774076,51704062)
详细信息
    通讯作者:

    E-mail:liying@mail.neu.edu.cn

  • 中图分类号: TM 911

Performance of perovskite-type Li-ion solid electrolyte Li2xySr1−xTi1−yNbyO3

More Information
  • 摘要: 采用高温固相法成功制备了Li2xySr1−xTi1−yNbyO3 (x=3y/4, y=0.25, 0.5, 0.6, 0.7, 0.75, 0.8)锂离子固体电解质,并通过X射线衍射(XRD)、扫描电子显微镜(SEM)、交流阻抗图谱、恒电位极化等分别研究了各个组分的晶体结构、微观形貌、离子电导率和电子电导率。XRD显示当y≤0.70时,材料为立方钙钛矿型结构,几乎没有杂质相生成。SEM表明随着掺杂含量的增加材料的晶粒尺寸逐渐增大。Li0.35Sr0.475Ti0.3Nb0.7O3锂离子固体电解质有着高离子电导率,为3.62×10−5 S·cm−1,其电子电导率为2.55×10−9 S·cm−1,活化能仅为0.29 eV。使用以Li0.35Sr0.475Ti0.3Nb0.7O3为隔膜的LiFePO4/Li半电池经过100圈循环后,放电比容量仍有93.9 mA·h·g−1,容量保持率为90.72%。

     

  • 图  1  Li2xySr1−xTi1−yNbyO3材料的XRD图谱

    Figure  1.  XRD pattern of Li2xySr1−xTi1−yNbyO3

    图  2  Li2xySr1−xTi1−yNbyO3 (x=3y/4, y=0.25, 0.5, 0.6, 0.7)的拟合XRD图谱

    Figure  2.  Fitted XRD patterns of Li2xySr1−xTi1−yNbyO3 (x = 3y/4, y = 0.25, 0.5, 0.6, 0.7)

    图  3  Li2xySr1−xTi1−yNbyO3材料的SEM图

    Figure  3.  SEM photographs of Li2xySr1−xTi1−yNbyO3

    图  4  Li2xySr1−xTi1−yNbyO3样品的XPS总谱图(a)及Sr 3d(b)、Ti 2p(c)、Nb 3d(d)的区域XPS谱图

    Figure  4.  XPS spectra of Li2xySr1−xTi1−yNbyO3 samples (a), regions XPS spectra of Sr 3d (b), Ti 2p (c), Nb 3d (d)

    图  5  20 ℃时Li2xySr1−xTi1−yNbyO3固体电解质的交流阻抗图谱

    Figure  5.  AC Impedance spectra of Li2xySr1−xTi1−yNbyO3 solid electrolytes at 20 ℃

    图  6  Li2xySr1−xTi1−yNbyO3固体电解质的Arrhenius曲线

    Figure  6.  Arrhenius curves of Li2xySr1−xTi1−yNbyO3 solid electrolytes

    图  7  Li2xySr1−xTi1−yNbyO3固体电解质的恒电位极化曲线

    Figure  7.  Li2xySr1−xTi1−yNbyO3 solid electrolytes constant potential polarization curves

    图  8  以Li0.35Sr0.475Ti0.3Nb0.7O3为隔膜LiFePO4/Li半电池的充放电曲线图(a),放电比容量与库伦效率曲线图(b),电池的阻抗图谱(c)

    Figure  8.  Charge-discharge curves (a), discharge capacity and coulombic efficiency curves (b), AC impedance plot (c) of LiFePO4/Li half-cell with Li0.35Sr0.475Ti0.3Nb0.7O3 as the separator

    表  1  Li2xySr1−xTi1−yNbyO3 (x=3y/4, y=0.25, 0.5, 0.6, 0.7)的晶胞精修数据

    Table  1.   Crystal refinement data of Li2xySr1−xTi1−yNbyO3 (x = 3y/4, y = 0.25, 0.5, 0.6, 0.7)

    SampleLattice
    constant/
    nm
    Unweighted-
    profile R
    factor /%
    Weighted
    profile R
    factor/%
    Goodness
    of fit
    Li0.125Sr0.8125Ti0.75Nb0.25O30.391637.3519.7487.634
    Li0.25Sr0.625Ti0.5Nb0.5O30.393156.2918.2293.709
    Li0.3Sr0.55Ti0.4Nb0.6O30.393716.5408.96310.897
    Li0.35Sr0.475Ti0.3Nb0.7O30.394226.3548.6489.334
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  • 收稿日期:  2020-12-03
  • 网络出版日期:  2021-03-27
  • 刊出日期:  2021-08-25

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