Paramount attention has been paid on solid polymer electrolytes due to their potential in enhancement of energy density as well as improvement of safety. Herein, the composite electrolytes consisting of Li-salt-free polyethylene oxides and 200 nm-sized Li_6.4La₃Zr_1.4Ta_0.6O₁₂ particles interfacially wetted by [BMIM]TF₂N of 1.8 μL cm⁻² have been prepared. Such wetted ionic liquid remains the solid state of membrane electrolytes and decreases the interface impedance between the electrodes and the electrolytes. There is no release of the liquid phase from the PEO matrix when the pressure of 5.0 × 10⁴ Pa being applied for 24 h. The interfacially wetted membrane electrolytes show the conductivity of 2.2 × 10⁻⁴ S cm⁻¹ at 20 °C, which is one order of magnitude greater than that of the membranes without the wetted ionic liquids. The conduction mechanism is related to a large number of lithium ions releasing from Li_6.4La₃Zr_1.4Ta_0.6O₁₂ particles and the improved conductive paths along the ion-liquid-wetted interfaces between the polymer matrix and ceramic grains. When the membranes being used in the solid-state LiFePO₄/Li and LiFe_0.15Mn_0.85PO₄/Li cells at 25 °C, the excellent rate capability and superior cycle stability has been shown. The results provide a new prospect for solid polymer electrolytes used for room-temperature solid-state lithium batteries.

由于固体聚合物电解质具有提高能量密度和提高安全性的潜力，因此已经引起了人们的极大关注。在此，已经制备了由无锂盐的聚环氧乙烷和被1.8μLcm ^-2的[BMIM] TF ₂ N界面润湿的200nm尺寸的Li _6.4 La ₃ Zr _1.4 Ta _0.6 O ₁₂颗粒组成的复合电解质。这种润湿的离子液体保持膜电解质的固态，并降低电极和电解质之间的界面阻抗。当压力为5.0×10 ⁴时，不会从PEO基质中释放出液相 施加Pa 24小时。界面润湿的膜电解质在20℃下显示出2.2×10 ^-4  S cm ^-1的电导率，比没有润湿的离子液体的膜的电导率大一个数量级。导电机理与Li _6.4 La ₃ Zr _1.4 Ta _0.6 O ₁₂颗粒中释放出的大量锂离子以及聚合物基体和陶瓷颗粒之间沿离子液体润湿界面的改善的导电路径有关。当将膜用于固态LiFePO ₄ / Li和LiFe _0.15 Mn _0.85 PO _4时/ Li电池在25°C时，已显示出优异的速率能力和出色的循环稳定性。该结果为用于室温固态锂电池的固态聚合物电解质提供了新的前景。