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Due to its intriguing geometry, possessing an open-channel structure, Si 24 demonstrates potential for storing and/or transporting Li/Na ions in rechargeable batteries. In this work, first-principles calculations were employed to investigate the phase stability and Li/Na storage and transport properties of the Si 24 anode to evaluate its electrochemical performance for batteries. The intercalation of Li and Na into the Si 24 structure could deliver a capacity of 159 mA h g -1 (Li 4 Si 24 and Na 4 Si 24 ), and the average intercalation potentials were 0.17 V ( vs. Li) and 0.34 V ( vs. Na). Moreover, the volume change of Si 24 upon intercalation proved very small (0.09% for Li, 2.81% for Na), indicating its "zero-strain" properties with stable cycling performance. Li + and Na + can diffuse along the channels inside the Si 24 structure with barrier energies of 0.14 and 0.80 eV respectively, and the ionic conductivity of Li 2.66 Si 24 was calculated to be as high as 1.03 × 10 -1 S cm -1 at 300 K. Our calculations indicate that the fast Li-ionic conductivity properties make the Si 24 structure a novel anode material for both lithium and sodium ion batteries.

A first-principles study on Si24 as an anode material for rechargeable batteries

A first-principles study on Si₂₄ as an anode material for rechargeable batteries