Solid state batteries show great improvement of safety compared to batteries with liquid electrolytes. Polyethylene oxide (PEO) has been the most classic solid polymer electrolyte matrix. However, PEO based polymer electrolyte with lithium salt suffers from high crystallinity, poor Li⁺ transport kinetics and low ionic conductivity, especially at room temperature, which hindered its further application. Herein, a mesoporous silica derived active filler has been prepared with Li⁺ contained ionic liquid physically immobilized in the nanopore structure. PEO based solid polymer electrolyte with the active filler shows low crystallinity of 30% and a remarkable high ionic conductivity of 4.3 × 10⁻⁴ S cm⁻¹ at 60 °C, at the same time maintaining a good mechanical strength of 1.28 MPa. The assembled lithium symmetric battery shows stable and long cycle performance. And the Li/LiFePO₄ also shows stable cycling performance, maintaining 88.4% initial capacity after 80 cycles at 0.1C at 60 °C.

与具有液体电解质的电池相比，固态电池显示出极大的安全性改进。聚环氧乙烷（PEO）一直是最经典的固体聚合物电解质基质。然而，具有锂盐的PEO基聚合物电解质尤其在室温下具有高结晶度，差的Li ⁺传输动力学和低离子电导率，这阻碍了其进一步的应用。本文中，已经制备了具有物理固定在纳米孔结构中的含Li ^+的离子液体的介孔二氧化硅衍生的活性填料。具有活性填料的PEO基固体聚合物电解质显示出30％的低结晶度和4.3×10 ^-4  S cm ^-1的显着高离子电导率在60°C时，同时保持1.28 MPa的良好机械强度。组装好的锂对称电池表现出稳定且长周期的性能。Li / LiFePO ₄也显示出稳定的循环性能，在60°C下于0.1C进行80次循环后，可保持88.4％的初始容量。