The electrochemical stability window of NASICON-structured glass-ceramics of the Li_1+xCr_x(Ge_yTi_1-y)_2-x(PO₄)₃ system is investigated by a combination of cyclic voltammetry, electrochemical impedance, and X-ray photoelectron spectroscopy techniques. Cyclic voltammetry analyses are performed using a three-electrode setup cell where Ag₃SI/Ag is applied as a reference electrode. Cyclic voltammetry measurements are followed by in situ electrochemical impedance spectroscopy, enabling the effect of oxidation and reduction reactions on the electrical properties of the glass-ceramics in question to be determined. X-ray photoelectron spectroscopy, in turn, is applied to determine which chemical species undergo reduction/oxidation. Our findings reveal that the electrochemical stability of this material is limited by the reduction of Ti⁺⁴ cations in low potentials (around 2.1 V vs. Li⁺/Li) and by the oxidation of O⁻² anions in high potentials (4.8 V vs. Li⁺/Li). After the first cycle, the electrolytes seem to be stable within a much broader electrochemical window than in the first cycle. However, the results indicate not only that the reduction at low potential is not deleterious to the electrical properties of the electrolytes but also that the oxidation reaction at high potentials is highly detrimental. These findings contradict the common perception about the outstanding stability of NASICON-structured electrolytes in oxidation potentials.

通过循环伏安法，电化学阻抗和X的组合研究了Li _{1 + x} Cr _x（Ge _y Ti _1-y）_2-x（PO ₄）₃体系的NASICON结构的玻璃陶瓷的电化学稳定性窗口。射线光电子能谱技术。使用三电极设置池执行循环伏安分析，其中将Ag ₃ SI / Ag用作参比电极。循环伏安法测量后进行原位测量电化学阻抗谱，可以确定氧化和还原反应对有关玻璃陶瓷电性能的影响。依次使用X射线光电子能谱法确定哪些化学物质经历了还原/氧化。我们的发现表明，该材料的电化学稳定性受到低电位（约2.1 V vs. Li ⁺ / Li）中Ti ⁺⁴阳离子的还原以及高电位（4.8 V vs. Li）中O ^-2阴离子的氧化的限制。李⁺/ Li）。在第一循环之后，电解质似乎在比第一循环中宽得多的电化学窗口内是稳定的。但是，结果不仅表明低电势下的还原对电解质的电性能无害，而且高电势下的氧化反应也是有害的。这些发现与关于NASICON结构的电解质在氧化电势中具有出色稳定性的普遍看法相矛盾。