Hu Yueli, Chen Yuejiao, Wang Xiaodong, Zhou Peng, He Lirong, Chen Libao, Zhang Mingyu
State Key Laboratory of Powder Metallurgy, Central South University, Changsha, Hunan 410083, PR China.
National Key Laboratory of Science and Technology on High-strength Structural Materials, Central South University, Changsha 410083, PR China.
Nano Lett. 2024 Jul 31;24(30):9178-9185. doi: 10.1021/acs.nanolett.4c01241. Epub 2024 Jul 17.
Lithium (Li) dendritic growth and huge volume expansion seriously hamper Li-metal anode development. Herein, we design a lightweight 3D Li-ion-affinity host enabled by silver (Ag) nanoparticles fully decorating a porous melamine sponge (Ag@PMS) for dendrite-free and high-areal-capacity Li anodes. The compact Ag nanoparticles provide abundant preferred nucleation sites and give the host strong conductivity. Moreover, the high specific surface area and polar groups of the elastic, porous melamine sponge enhance the Li-ion diffusion kinetics, prompting homogeneity of Li deposition and stripping. As expected, the integrated 3D Ag@PMS-Li anode delivered a remarkable electrochemical performance, with a Coulombic efficiency (CE) of 97.14% after 450 cycles at 1 mA cm. The symmetric cell showed an ultralong lifespan of 3400 h at 1 mA cm for 1 mAh cm. This study provides a facile and cost-effective strategy to design an advanced 3D framework for the preparation of a stable dendrite-free Li metal anode.
锂（Li）枝晶生长和巨大的体积膨胀严重阻碍了锂金属阳极的发展。在此，我们设计了一种轻质的三维锂离子亲和主体，它由银（Ag）纳米颗粒完全装饰在多孔三聚氰胺海绵（Ag@PMS）上构成，用于无枝晶且高面积容量的锂阳极。紧密排列的Ag纳米颗粒提供了丰富的优先成核位点，并赋予主体高导电性。此外，弹性多孔三聚氰胺海绵的高比表面积和极性基团增强了锂离子扩散动力学，促进了锂沉积和剥离的均匀性。正如预期的那样，集成的三维Ag@PMS-Li阳极展现出卓越的电化学性能，在1 mA cm下循环450次后库仑效率（CE）为97.14%。对称电池在1 mA cm下对于1 mAh cm²表现出3400 h的超长寿命。这项研究提供了一种简便且经济高效的策略，用于设计一种先进的三维框架，以制备稳定的无枝晶锂金属阳极。
