Garnet solid electrolyte is the most promising candidate among inorganic solid electrolytes due to its wide potential window, good compatibility and high safety. In this work, a dual doping strategy is offered for the development of garnet-type electrolytes with high ionic conductivity. Te⁶⁺ is introduced into the Zr sites to stabilize the high-ionic conductivity cubic phase. Simultaneously, Sr²⁺ enter the La sites to achieve a fine-tuning of the Li⁺ concentration by charge compensation, acting as a sintering agent of Te⁶⁺/Sr²⁺ doped electrolytes. The structure, chemical composition and ionic conductivity of Li_7−2y+xLa_3−xSr_xZr_2−yTe_yO₁₂ (x = 0–0.25, and y = 0.35) electrolytes are systematically investigated by X-ray diffraction, Raman spectroscopy, scanning electron microscope, Energy Dispersive X-ray Spectroscopy, Inductively Coupled Plasma-Optical Emission Spectrometry and Alternating Current impedance. The results show that the optimal amount of Sr²⁺ substitution helps to reduce the total resistance by promoting the growth of grains and ceramic densification. Among the investigated compositions, the composition with Li_6.425La_2.875Sr_0.125Zr_1.65Te_0.35O₁₂ exhibits excellent performance with relative density of 97.95%, conductivity of 4.27 × 10⁻⁴ S cm⁻¹ at 25 °C and activation energy of 0.30 eV. The assembled Li/Li_6.425La_2.875Sr_0.125Zr_1.65Te_0.35O₁₂/Li symmetrical batteries are cycled galvanostatically under different current densities. The results show that the symmetrical battery can achieve good cyclic stability, good Li⁺ stripping and plating process and low overpotential.

石榴石固体电解质由于其宽的电位窗口，良好的相容性和较高的安全性而成为无机固体电解质中最有希望的候选者。在这项工作中，为开发具有高离子电导率的石榴石型电解质提供了双重掺杂策略。将Te ⁶⁺引入Zr部位以稳定高离子电导率立方相。同时，Sr ²⁺进入La位置以通过电荷补偿实现Li ⁺浓度的微调，并作为掺入Te ⁶⁺ / Sr ^2+的电解质的烧结剂。的结构，化学组成和离子传导率的Li _{7 - 2 ý + X}拉 通过X射线衍射，拉曼光谱，扫描电子显微镜，能量色散X射线光谱法，归纳法系统地研究了_{3 − x} Sr _x Zr _{2 − y} Te _y O ₁₂（x  = 0–0.25，y = 0.35）耦合等离子体发射光谱法和交流阻抗。结果表明，最佳的Sr ²⁺取代量可通过促进晶粒的生长和陶瓷致密化来降低总电阻。在研究的成分中，具有Li _6.425 La _2.875 Sr _{0.125的成分}Zr _1.65 Te _0.35 O ₁₂具有优异的性能，相对密度为97.95％，在25°C下的电导率为4.27×10 ^-4  S cm ^-1，活化能为0.30 eV。组装好的Li / Li _6.425 La _2.875 Sr _0.125 Zr _1.65 Te _0.35 O ₁₂ / Li对称电池在不同电流密度下恒电流循环。结果表明，该对称电池可实现良好的循环稳定性，良好的Li ⁺剥离和镀覆过程以及较低的过电势。