Achieving fast lithium/sodium storage reaction kinetics through semiconductor hetero-interface construction derived...

Area of Science:

• Materials Science
• Electrochemistry
• Nanotechnology

Background:

• Heterojunction structures improve ion transfer via built-in electric fields.
• Metal-organic frameworks (MOFs) yield unique materials for enhanced battery performance.
• Iron-based anodes are crucial for lithium-ion batteries (LIBs) and sodium-ion batteries (SIBs).

Purpose of the Study:

• To design MOF-derived FeP/Fe3O4 heterostructures with varying ratios.
• To enhance the lithium and sodium storage performance of iron-based anodes.
• To investigate the effect of component ratios on heterojunction properties and electrochemical performance.

Main Methods:

• Synthesis of MOF-derived FeP/Fe3O4 heterostructures with controlled ratios.
• Electrochemical testing of LIBs and SIBs using the synthesized anodes.
• Density Functional Theory (DFT) calculations to verify electronic effects and ion diffusion.

Main Results:

• FeP/Fe3O4-73 (high FeP content) demonstrated superior capacity retention in rate and cycling tests.
• FeP/Fe3O4-73 achieved 1318.5 mAh g-1 (100 cycles, 0.1 A g-1) as LIB anode and 429 mAh g-1 (100 cycles, 0.1 A g-1) as SIB anode.
• Calcination temperature effectively regulated FeP/Fe3O4 ratios, optimizing electrochemical performance.

Conclusions:

• The ratio of FeP/Fe3O4 in MOF-derived heterostructures significantly impacts lithium/sodium storage.
• Optimized heterojunctions provide synergistic electronic effects, reducing ion diffusion barriers.
• This study offers valuable insights for developing novel iron-based heterojunction systems for energy storage.