Morphology- and Porosity-Tunable Synthesis of 3D-Nanoporous SiGe Alloy as High-Performance Lithium-Ion Battery Anode.

Author(s) Yang, Y.; Liu, S.; Bian, X.F.; Feng, J.; An, Y.; Yuan, C.
Journal ACS Nano
Date Published 2018 Mar 12
Abstract

The lithium-storage performance of silicon (Si) can be enhanced by alloyed with germanium (Ge) because of its good electronic and ionic conductivity. Here we synthesized three-dimensional nanoporous (3D-NP) SiGe alloy as high performance lithium-ion battery (LIB) anode using a dealloying method with ternary AlSiGe ribbon served as precursor. The morphology and porosity of as-synthesized SiGe alloy can be controlled effectively by adjusting the sacrificial Al content of the precursor. With a 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 gafter 150 cycles at a current density of 1000 mA gwith excellent rate capacity. The strategy might provide guidelines for nanostructures optimization and mass production of energy storage materials.

DOI 10.1021/acsnano.8b00426
ISSN 1936-086X
Citation ACS Nano. 2018.

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