Article: High-performance SiGe anode materials obtained by dealloying a Sr-modified Al-Si-Ge eutectic precursor

In exploring the anode materials for high efficiency Li-ion batteries, it has been found that the electrochemical performance of Si can be enhanced alloying with Ge. In the present work, we modified the Al-Si-Ge eutectic ribbons as the precursor by adding a trace of Sr to the alloy. The SiGe particles obtained by dealloying the Al-Si-Ge eutectic precursor have a porous coral-like nano-architecture with numerous fibrous branches towards various directions. Because of the large surface area and porosity, the as-prepared Sr-modified SiGe anode delivers an excellent capacity of 1166.6 mA h g at 0.1 A g after 100 cycles with a fantastic initial coulombic efficiency of 83.62%. Besides, it has a superior rate performance with a reversible capacity of 675.3 mA h g at the current density of 8 A g. It is demonstrated that the modification treatment that is widely used in metallurgy is also a promising strategy to synthesize high-performance battery electrodes and other energy storage materials.

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PMID: 38647404 PMC: 11199986. DOI: 10.1002/advs.202308955.

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High-performance SiGe Anode Materials Obtained by Dealloying a Sr-modified Al-Si-Ge Eutectic Precursor