Poly(ethylene oxide) (PEO), an important solid polymer electrolyte (SPE) for solid‐state lithium batteries, suffers from low ionic conductivity and poor electrochemical stability; many inorganic solid compounds have been explored as fillers to address these issues. Herein, we report that Al‐metal organic framework (MOF) nanorods could work as efficient solid fillers to boost the electrochemical performance of PEO‐based SPEs. The addition of MOF nanorods was found to inhibit the crystallization of PEO and effectively weaken the interactions among the PEO chains, resulting in evidently enhanced ionic conductivity and improved electrochemical stability; moreover, when embedded in PEO, such Al‐MOF nanorods are microporous and micrometer long, which are expected to favor the transportation of Li⁺ over the significantly more bulky anions TFSI⁻. Compared with pure PEO SPE, our optimal sample PEO‐MOF_5% SPE has higher ion conductivity (2.09×10⁻⁵ S/cm at 30 °C and 7.11×10⁻⁴ S/cm 60 °C), a larger lithium‐ion transference number (0.46) and an enlarged electrochemical window (4.7 V versus Li/Li⁺). Accordingly, the cell of LiFePO₄/PEO‐MOF_5%/Li shows excellent cycle performance and rate performance. Our work proved the advantages of MOF particles as solid fillers towards high‐performance PEO‐based SPE, and we also put emphasis on the shape effect of the solid fillers on the lithium‐ion transference number and, thus, the electrochemical performance of the resulting SPE.

中文翻译：

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高性能全固态锂电池结晶度降低的金属有机骨架纳米棒掺杂固体聚合物电解质

聚环氧乙烷（PEO）是固态锂电池的一种重要的固体聚合物电解质（SPE），其离子电导率低且电化学稳定性差。已经探索了许多无机固体化合物作为填料来解决这些问题。在本文中，我们报道铝有机金属骨架（MOF）纳米棒可作为有效的固体填料，以提高基于PEO的SPE的电化学性能。发现添加MOF纳米棒可抑制PEO的结晶并有效削弱PEO链之间的相互作用，从而显着增强离子电导率并改善电化学稳定性。此外，当嵌入PEO中时，这种Al-MOF纳米棒具有微孔和微米长，有望促进Li ⁺的传输。在显著更庞大的阴离子TFSI ^- 。与纯PEO SPE相比，我们的最佳样品PEO-MOF _5％ SPE具有更高的离子电导率（ 30°C下为2.09×10 ^-5 S / cm和 60°C下为7.11×10 ^-4 S / cm）离子转移数（0.46）和扩大的电化学窗口（4.7 V对Li / Li ⁺）。因此，LiFePO ₄ / PEO-MOF _5％的电池/ Li显示出色的循环性能和速率性能。我们的工作证明了MOF颗粒作为固体填料对基于高性能PEO的SPE的优势，并且我们还强调了固体填料的形状效应对锂离子转移数的影响，并因此提高了所得产物的电化学性能。 SPE。