Eunmo Ku, Ho-Sung Yang, Hae Gon Lee, Hoseong Lee, Byungkyu Jeon, Seong-Ung Hong, Seokwon Hong, Hee-Dae Lim, Jun-Ho Park, Jung Han Kim, Jun Choi, Byoung-Sun Lee
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引用次数: 0
Abstract
We report a design for a synergistic lithium (Li) metal hosting layer for high-loading Li(Ni,Co,Al)O2 (NCA) (≥5 mA h cm–2)||Li–metal full cells in carbonate electrolytes. Based on density functional theory calculations, the hosting layer was designed as a three-dimensional silver/carbon composite nanofiber (Ag/CNF) network with high Li affinity and a platinum (Pt)-coated polypropylene separator with low Li affinity. This design enabled the tailoring of horizontal Li deposition on the Ag/CNF hosting layer. The Li deposition behavior modulated by the hosting layer was thoroughly examined based on the initial Li deposition and cycling behaviors of the Li||Li symmetric cell configuration. Cryogenic focused-ion beam cross-sectional images of the cycled Li anodes clearly demonstrated that dense lithium deposition was enabled by the synergistic hosting layer high-loading NCA (≥5 mA h cm–2)||Li–metal full cells. When the hosting layer was used, the average cycling performance improved by 78.27% under various cycling conditions. Our work demonstrates that the synergistic hosting layer design is a fruitful pathway to accelerate the commercialization of high-energy-density Li–metal batteries in carbonate electrolytes.
我们报告了碳酸盐电解质中高负荷锂(Ni,Co,Al)O2 (NCA) (≥5 mA h cm-2)||锂金属全电池的协同锂(Li)金属寄存层设计。根据密度泛函理论计算,寄存层被设计为具有高锂离子亲和力的三维银/碳复合纳米纤维(Ag/CNF)网络和具有低锂离子亲和力的铂(Pt)涂层聚丙烯隔膜。通过这种设计,可以在 Ag/CNF 承载层上定制水平锂沉积。根据锂||锂对称电池配置的初始锂沉积和循环行为,对寄存层调制的锂沉积行为进行了深入研究。循环锂阳极的低温聚焦离子束横截面图像清楚地表明,高负载 NCA(≥5 mA h cm-2)||锂金属全电池的协同寄存层促成了锂的密集沉积。使用寄存层后,在各种循环条件下的平均循环性能提高了 78.27%。我们的工作表明,协同寄存层设计是加速碳酸盐电解质高能量密度锂金属电池商业化的一条富有成效的途径。
期刊介绍:
ACS Nano, published monthly, serves as an international forum for comprehensive articles on nanoscience and nanotechnology research at the intersections of chemistry, biology, materials science, physics, and engineering. The journal fosters communication among scientists in these communities, facilitating collaboration, new research opportunities, and advancements through discoveries. ACS Nano covers synthesis, assembly, characterization, theory, and simulation of nanostructures, nanobiotechnology, nanofabrication, methods and tools for nanoscience and nanotechnology, and self- and directed-assembly. Alongside original research articles, it offers thorough reviews, perspectives on cutting-edge research, and discussions envisioning the future of nanoscience and nanotechnology.