Solid electrolytes with high ionic conductivity and good mechanical properties are required for solid-state lithium-ion batteries. In this work, we synthesized composite polymer electrolytes (CPEs) with a three-dimensional (3D) Li_0.33La_0.557TiO₃ (LLTO) network as a nano-backbone in poly(ethylene oxide) matrix by hot-pressing and quenching. Self-standing 3D-CPE membranes were obtained with the support of the LLTO nano-backbone. These membranes had much better thermal stability and enhanced mechanical strength in comparison with solid polymer electrolytes. The influence of lithium (Li) salt concentration on the conductivity of 3D-CPEs was systematically studied, and an ionic conductivity as high as 1.8 × 10^–4 S·cm^–1 was achieved at room temperature. The electrochemical window of the 3D-CPEs was 4.5 V vs Li/Li⁺. More importantly, the 3D-CPE membranes could suppress the growth of Li dendrite and reduce polarization; therefore, a symmetric Li|3D-CPE|Li cell with these membranes was cycled at a current density of 0.1 mA·cm^–2 for over 800 h. All of the superior properties above made the 3D-CPEs with the LLTO nano-backbone a promising electrolyte candidate for flexible solid-state lithium-ion batteries.

中文翻译：

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全固态锂离子电池用富含锂盐的PEO / Li _0.3 La _0.557 TiO ₃互穿复合电解质与三维陶瓷纳米主链

固态锂离子电池需要具有高离子电导率和良好机械性能的固体电解质。在这项工作中，我们通过热压和淬火合成了具有三维（3D）Li _0.33 La _0.557 TiO ₃（LLTO）网络的复合聚合物电解质（CPE），作为聚环氧乙烷基质中的纳米骨干。在LLTO纳米骨干的支持下获得了自立式3D-CPE膜。与固体聚合物电解质相比，这些膜具有更好的热稳定性和增强的机械强度。系统地研究了锂盐浓度对3D-CPEs电导率的影响，离子电导率高达1.8×10 ^–4 S·cm ^–1在室温下达到。3D-CPE的电化学窗口为4.5 V（相对于Li / Li ^+）。更重要的是，3D-CPE膜可以抑制Li树枝状晶体的生长并减少极化。因此，带有这些膜的对称Li | 3D-CPE | Li电池在0.1 mA·cm ^–2的电流密度下循环800个小时以上。以上所有优越的性能使具有LLTO纳米骨干的3D-CPE成为柔性固态锂离子电池的有希望的电解质候选者。