Li_1.3Al_0.3Ti_1.7(PO₄)₃ (LATP) has become the focus of research because of its high ionic conductivity, high oxidation voltage, and low air sensitivity. However, Ti⁴⁺ is easily reduced by Li metal. In this paper, amorphous Li_1.5Al_0.5Ge_1.5(PO₄)₃ (a-LAGP) is introduced as an interface modification layer, because LAGP has the small electrochemical potential difference and Ge⁴⁺ is more difficult to be reduced by Li. Radio frequency sputtering (RF sputtering) is adopted to modify the a-LAGP thickness less than 100 nm. Compared with crystalline LAGP layer, a-LAGP has a better effect on improving the interface stability of LATP and Li. With the a-LAGP film, the Li/a-LAGP/LATP/a-LAGP/Li symmetrical cell is still stable after 100 cycles with the over potential changing from 1 V to 3 V. The probable mechanism of the good stability between a-LAGP and Li are discussed.

中文翻译：

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通过无定形Li 1.5 Al 0.5 Ge 1.5（PO 4）3改性提高Li 1.3 Al 0.3 Ti 1.7（PO 4）3和锂金属的界面稳定性

Li _1.3 Al _0.3 Ti _1.7（PO ₄）₃（LATP）由于其高离子电导率，高氧化电压和低空气敏感性而成为研究的焦点。但是，Li ⁴容易还原Ti ⁴⁺。本文引入了非晶态的Li _1.5 Al _0.5 Ge _1.5（PO ₄）₃（a-LAGP）作为界面修饰层，因为LAGP具有小的电化学势差和Ge ⁴⁺李更难减少。采用射频溅射（RF溅射）将a-LAGP的厚度修改为小于100nm。与晶体LAGP层相比，α-LAGP对改善LATP和Li的界面稳定性具有更好的作用。使用a-LAGP薄膜，Li / a-LAGP / LATP / a-LAGP / Li对称电池在经过100次循环后仍保持稳定，且过电势从1 V变为3V。 -讨论了LAGP和Li。