Lithium (Li) metal has been considered as an important anode candidate to reach more powerful energy storage devices with higher gravimetric and volumetric capacities. Nevertheless, the growth of high surface area lithium (HSAL) and dendrites during the stripping/deposition of Li causes safety concerns and a low cycle life of Li metal batteries. Here, we report the obtained results for protection of metallic lithium surface by using a gel polymer ionic liquid cross-linked by activation with UV radiation (UV-PIL). The UV-PIL protects Li against the constant degradation caused by the formation of unstable lithium metal–electrolyte interphase and cell dry out due to continuous electrolyte consumption. We observed retarded growth of dendrites when lithium metal was protected with UV-PIL, and due to the lower ionic conductivity of UV-PIL, some differences of mass transport are present compared to carbonate-based liquid electrolyte. Nevertheless, the [email protected] negative electrode was successfully applied in a Li-ion battery with a lithium iron phosphate (LFP) positive electrode, showing similar behavior compared to the bare Li surface.

中文翻译：

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交联聚合物离子液体对锂金属的保护作用及其在锂电池中的应用

锂（Li）金属已被视为重要的阳极候选材料，可用于实现具有更高重量和体积容量的功能更强大的储能设备。然而，在锂的剥离/沉积过程中高表面积锂（HSAL）和树枝状晶体的生长引起安全隐患和锂金属电池的低循环寿命。在这里，我们报告通过使用通过紫外线辐射（UV-PIL）活化而交联的凝胶聚合物离子液体保护金属锂表面的结果。UV-PIL保护Li免受因不稳定的锂金属-电解质界面形成而引起的恒定降解，以及由于连续消耗电解质而使电池变干的问题。我们观察到当锂金属受到UV-PIL保护时，树枝状晶体的生长受阻，并且由于UV-PIL的离子电导率较低，与基于碳酸盐的液体电解质相比，存在一些质量传递的差异。然而，[受电子邮件保护的]负极已成功应用于具有磷酸铁锂（LFP）正极的锂离子电池中，与裸露的Li表面相比，其表现出相似的行为。