Solid-state electrolytes with high ionic conductivity, large electrochemical window, and excellent stability with lithium electrode are needed for high-energy solid-state lithium batteries. In this work, a novel polyethylene oxide (PEO)-Lithium bis(trifluoromethylsulphonyl)imide (LiTFSI)-nanocomposite-based polymer electrolyte was prepared by using nickel phosphate (VSB-5) nanorods as the filler. The ionic conductivity of the obtained PEO-LiTFSI-3%VSB-5 solid polymer electrolyte was found to be as high as 4.83 × 10-5 S·cm-1 at 30 °C and electrochemically stable up to about 4.13 V versus Li/Li+. The enhanced ionic conductivity was attributed to the reduced crystallinity of the PEO and the interaction between VSB and 5 and PEO-LiTFSI. In addition, the solid polymer electrolyte exhibited improved compatibility to the lithium metal anode with excellent suppression of lithium dendrites. The assembled LiFePO4/Li battery with the PEO-LiTFSI-3%VSB-5 solid polymer electrolyte showed better rate performance and higher cyclic stability than the PEO-LiTFSI electrolyte. It is demonstrated that this new solid polymer hybrid should be a promising electrolyte applied in solid state batteries with lithium metal electrode.

中文翻译：

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固态锂电池用磷酸镍纳米棒增强的聚环氧乙烷基复合聚合物电解质。

高能量固态锂电池需要具有高离子电导率，大的电化学窗口和优异的锂电极稳定性的固态电解质。在这项工作中，通过使用磷酸镍（VSB-5）纳米棒作为填充剂，制备了一种新型的聚环氧乙烷（PEO）-双（三氟甲基磺酰基）酰亚胺锂（LiTFSI）-纳米复合材料基聚合物电解质。发现所获得的PEO-LiTFSI-3％VSB-5固体聚合物电解质的离子电导率在30°C时高达4.83×10-5 S·cm-1，相对Li /电化学稳定至约4.13 V李+。离子电导率提高归因于PEO的结晶度降低以及VSB与5和PEO-LiTFSI之间的相互作用。此外，该固体聚合物电解质显示出与锂金属阳极的改善的相容性，并具有优异的锂枝晶抑制能力。与PEO-LiTFSI电解质相比，使用PEO-LiTFSI-3％VSB-5固体聚合物电解质组装的LiFePO4 / Li电池显示出更好的倍率性能和更高的循环稳定性。事实证明，这种新型的固体聚合物杂化物应该是一种有前途的电解质，可用于带有锂金属电极的固态电池。