Lithium‐Ion Transport in Li4Ti5O12 Epitaxial Thin Films vs. State of Charge,Batteries & Supercaps

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Lithium‐Ion Transport in Li4Ti5O12 Epitaxial Thin Films vs. State of Charge
Batteries & Supercaps ( IF 5.1 ) Pub Date : 2020-09-29 , DOI: 10.1002/batt.202000159
Francesco Pagani ₁ , Max Döbeli ₂ , Corsin Battaglia ₃

Affiliation

We investigate the electrochemical lithiation of epitaxial Li₄Ti₅O₁₂ thin‐film model electrodes grown on epitaxial platinum current collectors. Structure and composition of Li₄Ti₅O₁₂ films are confirmed by out‐of‐plane and in‐plane X‐ray diffraction and elastic recoil detection analysis. Employing different cell configurations, we deconvolute electrochemical impedance spectra and extract for the first time the lithium‐ion conductivity as a function of electrochemical lithiation. Lithium‐ion conductivity increases monotonously by more than two orders of magnitude from 2.6 ⋅ 10⁻⁹ S/cm in Li₄Ti₅O₁₂ to above 3 ⋅ 10⁻⁷ S/cm between Li_4.5Ti₅O₁₂ and Li₆Ti₅O₁₂ and drops again to 1.3 ⋅ 10⁻⁹ S/cm in Li₇Ti₅O₁₂. We discuss our results in light of nuclear magnetic resonance studies and theoretical models reported previously and derive important implications for fast‐charging applications of lithium‐ion batteries with Li₄Ti₅O₁₂ anodes.

中文翻译：

Li4Ti5O12外延薄膜中的锂离子迁移与电荷状态

我们研究在外延铂集电器上生长的外延Li ₄ Ti ₅ O ₁₂薄膜模型电极的电化学锂化。Li ₄ Ti ₅ O ₁₂膜的结构和组成通过面外和面内X射线衍射以及弹性反冲检测分析得到确认。利用不同的电池配置，我们对电化学阻抗谱进行反卷积，并首次提取锂离子电导率与电化学锂化的关系。 Li ₄ Ti ₅ O中锂离子电导率从2.6⋅10 ^-9 S / cm单调增加两个数量级以上₁₂以上3⋅10 ^-7 栗之间S /厘米_4.5的Ti ₅ ö ₁₂和Li ₆的Ti ₅ ö ₁₂并再次下降到1.3⋅10 ^-9 S / cm的锂₇的Ti ₅ Ò ₁₂。我们根据先前的核磁共振研究和理论模型讨论了我们的结果，并得出了对于使用Li ₄ Ti ₅ O ₁₂阳极的锂离子电池快速充电应用的重要意义。

更新日期：2020-09-29

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