Abstract
The interfacial characteristics of the Li metal anode (LMA) play a crucial role in its overall performance. Despite various materials being applied to modify the interface, a comprehensive understanding of their specific mechanisms remains to be investigated. Herein, we have prepared carbon cloth (CC) frameworks with their surfaces modified using ferromagnetic metal/LiF heterogeneous films (TM-LiF-CC) as the substrate for LMA, which exhibit superior electrochemical performance. Utilizing ferromagnetic Co as a representative example, our study demonstrates that the enhanced performance of Co-LiF-CC, compared to bare CC, is attributed to the spin-polarized interface contributed by the Co/LiF heterostructure. Co and LiF play individual roles in redistributing electrons and Li+ to promote homogeneous Li deposition. Co nanoparticles play a crucial role in generating strong surface capacitance by storing electrons in spin-split bands, while LiF, with low surface diffusion barriers, ensures fast transportation of Li+. The Co-LiF-CC@Li electrodes deliver long lives of 7400 and 3600 h at 1 and 2 mA·cm−2 in symmetric cells, respectively; moreover, they enable full batteries with high and durable capacities, particularly when the N/P ratios are low (3.3 or even 1.7).
Graphical Abstract
摘要
锂金属负极(LMA)的界面特性对其整体性能起着至关重要的作用。尽管有多种材料被用于界面改性,但其作用的具体机制仍有待研究。在此项工作中,我们制备了表面由铁磁性金属/氟化锂异质膜修饰的碳布骨架(TM-LiF-CC)作为锂金属负极的基底,其表现出优异的电化学性能。以铁磁性Co为例,与裸CC相比,Co-LiF-CC性能的提升得益于Co/LiF异质结构产生的自旋极化界面。Co和LiF能够重新分配电子和Li+,促进锂的均匀沉积。Co纳米颗粒在自旋分裂带中存储电子产生了强表面电容,而具有低表面扩散势垒的LiF促进了Li+的快速传输。因此,使用Co-LiF-CC@Li复合负极组装的对称电池在1和2 mA·cm-2的条件下分别稳定循环超过了7400和3600 h。同时,低N/P比的锂金属全电池表现出优异的循环性能。
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Acknowledgments
This study was financially supported by the National Natural Science Foundation of China (No. 52002270) and the China Postdoctoral Science Foundation (No. 2020M670661).
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Feng, MY., Zhou, S., Zhang, YF. et al. Charge regulation by ferromagnetic metal/LiF spin-polarized interface for high-performance Li metal anodes. Rare Met. 43, 995–1005 (2024). https://doi.org/10.1007/s12598-023-02517-4
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DOI: https://doi.org/10.1007/s12598-023-02517-4