Preparing 3D Perovskite Li0.33La0.557TiO3 Nanotubes Framework Via Facile Coaxial Electro‐Spinning Towards Reinforced Solid Polymer Electrolyte

It is of significance to construct continuous multiphase percolation channels with fast lithium‐ion pathway in hybrid solid electrolytes. 3D ceramic nanostructure frameworks have attracted great attention in this field. Herein, the three‐dimensional perovskite Li0.33La0.557TiO3 nanotubes framework (3D‐LLTO‐NT) is fabricated via a facile coaxial electro‐spinning process followed by a calcination process at 800 °C. The hybrid polymer electrolyte of 3D‐LLTO‐NT framework and poly (ethylene carbonate) (3D‐LLTO‐NT@PEC) shows improved ionic conductivity of 1.73 × 10−4 S cm−1 at ambient temperature, higher lithium‐ion transference number (tLi+) of 0.78 and electrochemical stability window up to 5.0 V vs Li/Li+. The all‐solid‐state cell of LiFePO4/3D‐LLTO‐NT@PEC/Li delivers a high specific capacity of 140.2 mAh g−1 at 0.1 C at ambient temperature. This outstanding performance is attributed to the 3D ceramic nanotubes frameworks which provide fast lithium ion transfer pathway and stable interfaces. The 3D perovskite LLTO nanotubes framework (3D‐LLTO‐NT) is fabricated successfully by coaxial electro‐spinning, which is a simple and effective method to prepare hollow nanotubes for solid‐state electrolytes. The obtained 3D‐LLTO‐NT@PEC polymer electrolyte has enhanced ionic conductivity. Meanwhile, the solid‐state battery using 3D‐LLTO‐NT@PEC electrolyte delivers excellent performance. This work presents a realizable method to further enhance the performance of polymer electrolytes.