Key Laboratory for Liquid-Solid Evolution and Processing of Materials (Ministry of Education), School of Materials Science and Engineering , Shandong University , Jinan 250061 , China.
ACS Nano. 2018 Mar 27;12(3):2900-2908. doi: 10.1021/acsnano.8b00426. Epub 2018 Mar 15.
The lithium storage performance of silicon (Si) can be enhanced by being alloyed with germanium (Ge) because of its good electronic and ionic conductivity. Here, we synthesized a three-dimensional nanoporous (3D-NP) SiGe alloy as a high-performance lithium-ion battery (LIB) anode using a dealloying method with a ternary AlSiGe ribbon serving as the precursor. The morphology and porosity of the as-synthesized SiGe alloy can be controlled effectively by adjusting the sacrificial Al content of the precursor. With an Al content of 80%, the 3D-NP SiGe presents uniformly coral-like structure with continuous ligaments and hierarchical micropores and mesopores, which leads to a high reversible capacity of 1158 mA h g after 150 cycles at a current density of 1000 mA g with excellent rate capacity. The strategy might provide guidelines for nanostructure optimization and mass production of energy storage materials.
硅（Si）与锗（Ge）合金化可以提高其储锂性能，因为其具有良好的电子和离子导电性。在此，我们使用三元 AlSiGe 带作为前驱体，通过脱合金化方法合成了一种具有三维纳米多孔（3D-NP）结构的 SiGe 合金，作为高性能锂离子电池（LIB）的阳极。通过调整前驱体中牺牲 Al 的含量，可以有效地控制所合成的 SiGe 合金的形态和孔隙率。当 Al 含量为 80%时，3D-NP SiGe 呈现出均匀的珊瑚状结构，具有连续的链状和分级的微孔和介孔，在 1000 mA g 的电流密度下循环 150 次后，可逆容量高达 1158 mA h g-1，具有优异的倍率性能。该策略可能为储能材料的纳米结构优化和大规模生产提供指导。
