Polyethylene oxide (PEO)-based solid polymer electrolytes (SPEs) have important significance for the development of next-generation rechargeable lithium-ion batteries. However, strong coordination between lithium ions and PEO chains results the ion conductivity usually lower than the expectation. In this study, sub-micron montmorillonite is incorporated into the PEO frames as Lewis base center which enables the lithium ions to escape the restraint of PEO chains. After involving montmorillonite (MMT) into the SPEs, the ionic conductivity of SPEs is 4.7 mS cm- 1 at 70 °C which shows a comparable value with that of liquid electrolyte. As coupling with LiFePO4 material, the battery delivers a high discharge capacity of 150.3 mAh g- 1 and an excellent rate performance with a capacity of 111.8 mAh g- 1 at 0.16 C and maintains 58.2 mAh g- 1 at 0.8 C. This study suggests that the customized incorporation of Lewis base materials could offer a promising solution for achieving high-performance PEO-based solid-state electrolyte.

中文翻译：

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蒙脱土为锂离子电池量身定制的具有高离子电导率的固体聚合物电解质。

基于聚环氧乙烷（PEO）的固体聚合物电解质（SPE）对下一代可充电锂离子电池的开发具有重要意义。但是，锂离子和PEO链之间的强配位导致离子电导率通常低于预期。在这项研究中，亚微米级蒙脱土作为路易斯碱中心并入PEO框架中，从而使锂离子能够摆脱PEO链的束缚。将蒙脱石（MMT）掺入SPE中后，SPE在70°C时的离子电导率为4.7 mS cm-1，这与液体电解质的电导率相当。与LiFePO4材料耦合后，该电池可提供150.3 mAh g-1的高放电容量和出色的倍率性能，在0.16 C时的容量为111.8 mAh g-1，在0.8 C时可保持58.2 mAh g-1。