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High-performance SiGe anode materials obtained by dealloying a Sr-modified Al-Si-Ge eutectic precursor.
1State Key Laboratory of Metal Matrix Composites, School of Materials Science and Engineering, Shanghai Jiao Tong University Shanghai 200240 China jfli@sjtu.edu.cn +86 21 54748530.
RSC Advances
|February 6, 2023
Summary
Adding strontium to aluminum-silicon-germanium alloys creates a porous SiGe anode for high-performance lithium-ion batteries. This novel material offers excellent capacity and superior rate performance, enhancing energy storage capabilities.
Area of Science:
- Materials Science
- Electrochemistry
- Energy Storage
Background:
- Silicon (Si) and germanium (Ge) are promising anode materials for lithium-ion batteries due to their high theoretical capacities.
- Alloying Si with Ge can improve electrochemical performance, but challenges remain in optimizing their structure and properties.
- Existing methods for synthesizing SiGe alloys often require complex procedures or result in suboptimal material architectures.
Purpose of the Study:
- To develop a novel, high-performance anode material for lithium-ion batteries.
- To investigate the effect of strontium (Sr) modification on the electrochemical properties of SiGe alloys.
- To explore a facile synthesis strategy for creating porous SiGe nano-architectures.
Main Methods:
- Modification of Al-Si-Ge eutectic alloy precursors with trace amounts of strontium (Sr).
- Dealloying the Sr-modified Al-Si-Ge precursor to obtain SiGe particles.
- Characterization of the resulting SiGe nano-architecture and evaluation of its electrochemical performance in lithium-ion batteries.
Main Results:
- The Sr-modified SiGe precursor yielded SiGe particles with a porous, coral-like nano-architecture and numerous fibrous branches.
- The as-prepared Sr-modified SiGe anode exhibited a high reversible capacity of 1166.6 mA h g⁻¹ at 0.1 A g⁻¹ after 100 cycles.
- The anode demonstrated excellent rate performance, retaining a capacity of 675.3 mA h g⁻¹ at a high current density of 8 A g⁻¹, with a remarkable initial coulombic efficiency of 83.62%.
Conclusions:
- Strontium modification is an effective strategy for synthesizing high-performance SiGe anode materials for lithium-ion batteries.
- The unique porous coral-like nano-architecture significantly contributes to the enhanced electrochemical properties.
- Metallurgical modification techniques offer a promising route for developing advanced electrode materials for energy storage applications.
