Morphology- and Porosity-Tunable Synthesis of 3D Nanoporous SiGe Alloy as a High-Performance Lithium-Ion Battery Anode,ACS Nano

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Morphology- and Porosity-Tunable Synthesis of 3D Nanoporous SiGe Alloy as a High-Performance Lithium-Ion Battery Anode
ACS Nano ( IF 15.8 ) Pub Date : 2018-03-12 00:00:00 , DOI: 10.1021/acsnano.8b00426
Yinghui Yang ₁ , Shuai Liu ₁ , Xiufang Bian ₁ , Jinkui Feng ₁ , Yongling An ₁ , Chao Yuan ₁

Affiliation

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^–1 after 150 cycles at a current density of 1000 mA g^–1 with excellent rate capacity. The strategy might provide guidelines for nanostructure optimization and mass production of energy storage materials.

中文翻译：

高性能锂离子电池阳极3D纳米多孔SiGe合金的形貌和孔隙率可调谐合成

通过与锗（Ge）合金化，可以提高硅（Si）的锂存储性能，因为它具有良好的电子和离子导电性。在这里，我们使用三元AlSiGe碳带作为前驱体，通过脱合金法合成了三维纳米多孔（3D-NP）SiGe合金，作为高性能锂离子电池（LIB）阳极。通过调节前体的牺牲Al含量，可以有效地控制合成后的SiGe合金的形貌和孔隙率。3D-NP SiGe的Al含量为80％，呈现出均匀的珊瑚状结构，具有连续的韧带，分层的微孔和中孔，在150次循环，电流密度为1000时，可逆容量为1158 mA hg ^–1 mA g ^–1具有出色的计费能力。该策略可能为纳米结构优化和能量存储材料的批量生产提供指导。

更新日期：2018-03-12

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