Journal
ACS NANO
Volume 12, Issue 3, Pages 2900-2908Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.8b00426
Keywords
chemical dealloying; Li-ion battery; anode; SiGe alloy; silicon; germanium
Categories
Funding
- National Natural Science Foundation of China [51571130]
- Young Scholars Program of Shandong University [2016WLJH03]
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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.
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