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A first-principles study on Si24 as an anode material for rechargeable batteries
Yu He1,2, Xia Lu3, Duck Young Kim1,4
1Center for High Pressure Science and Technology Advanced Research Shanghai 201203 China duckyoung.kim@hpstar.ac.cn.
RSC Advances
|May 11, 2022
Summary
Silicon-24 (Si24) shows promise as a novel anode material for rechargeable batteries. Its unique structure enables efficient lithium and sodium ion storage and transport, suggesting excellent electrochemical performance.
Area of Science:
- Materials Science
- Electrochemistry
- Computational Chemistry
Background:
- Silicon-based materials are promising for next-generation batteries.
- Developing stable anode materials with high ion transport is crucial for battery performance.
Purpose of the Study:
- Investigate the phase stability and Li/Na ion storage/transport properties of Si24.
- Evaluate the electrochemical performance of Si24 as an anode material for rechargeable batteries.
Main Methods:
- First-principles calculations were used to study Si24.
- Analyzed phase stability, ion intercalation, and diffusion barriers.
Main Results:
- Si24 exhibits a capacity of 159 mA h g-1 for Li/Na storage.
- Demonstrates "zero-strain" properties with minimal volume change (0.09% for Li, 2.81% for Na).
- Achieves high Li-ion conductivity (1.03 × 10-1 S cm-1) with low diffusion barriers (0.14 eV for Li+, 0.80 eV for Na+).
Conclusions:
- Si24 is a stable anode material with excellent Li/Na storage and transport capabilities.
- Its fast Li-ionic conductivity makes it a promising candidate for both lithium-ion and sodium-ion batteries.
