Lithium metal batteries (LMBs) have attracted wide attention as high-energy–density energy storage devices, but their practical applications are hindered due to capacity degradation and safety concerns arising from the growth of lithium (Li) dendrites. The interaction between the electrode and Li, encompassing both Li-ions and Li metal, display significant potential for solving Li-dendrite issues in LMBs. Here, a novel strategy is reported to thin hybrid coating (∼1.3 μm) comprising highly polar poly(vinylidene fluoride) (PVDF) and branched poly(ethyleneimine) (PEI) onto Cu foil, employed as a current collector for the Li metal anode. The branched PEI contains amine group side chains that effectively capture Li ions, thereby facilitating rapid Li-ion transfer kinetics. Moreover, the inclusion of PEI enhances the surface energy of the polymer coating, leading to a reduction in the nucleation radius of Li and the promotion of uniform Li deposition. When coupled with a LiFePO (LFP) cathode, the Li-E40V@Cu||LFP full cell demonstrates an impressive initial capacity of 141.8 mA h g, which remains at 118.1 mA h g after 518 cycles at 1C (1C = 170 mA h g). This investigation presents a novel approach to alleviate the formation of dendrites on Li metal anodes.

中文翻译：

---

通过支化胺有效捕获锂离子以获得稳定的锂金属阳极

锂金属电池（LMB）作为高能量密度的储能装置受到了广泛关注，但由于锂（Li）枝晶生长引起的容量下降和安全问题，其实际应用受到阻碍。电极和锂之间的相互作用（包括锂离子和锂金属）显示出解决 LMB 中锂枝晶问题的巨大潜力。在这里，报道了一种新策略，将包含高极性聚偏二氟乙烯（PVDF）和支化聚乙烯亚胺（PEI）的薄混合涂层（∼1.3 μm）沉积到铜箔上，用作锂金属阳极的集流体。支化 PEI 含有胺基侧链，可有效捕获锂离子，从而促进快速的锂离子转移动力学。此外，PEI的加入增强了聚合物涂层的表面能，导致Li的成核半径减小并促进均匀的Li沉积。当与 LiFePO (LFP) 阴极配合使用时，Li-E40V@Cu||LFP 全电池表现出令人印象深刻的 141.8 mA h g-1 的初始容量，在 1C 下循环 518 次后仍保持在 118.1 mA h g-1 (1C = 170 mA h g-1)。这项研究提出了一种减轻锂金属阳极上枝晶形成的新方法。