Activating Ferroelectric-Magnetic Synergistic Effects at Cathode-Electrolyte Interfaces Toward Superfast and Stable...

Area of Science:

• Materials Science
• Electrochemistry
• Solid-state Chemistry

Background:

• Layered oxides are key cathode materials for sodium-ion batteries, offering high energy density.
• Interfacial side reactions and slow kinetics limit their rate and cycling performance.

Purpose of the Study:

• To enhance the performance of layered oxide cathodes in sodium-ion batteries.
• To investigate the role of ferroelectric-magnetic synergistic effects at the electrode-electrolyte interface.

Main Methods:

• Constructing a multiferroic layer on a NaNi0.5Mn0.5O2 (NM) cathode surface.
• Analyzing interfacial layer formation, sodium-ion distribution, and local structure using the synergistic effects.

Main Results:

• Regulated interfacial layer growth, forming a NaF-enriched layer.
• Achieved uniform sodium-ion distribution and boosted charge transfer kinetics.
• Reduced NiO6 local structure distortion, enhancing cycling stability.
• Demonstrated superior cycling (82.1% retention after 1000 cycles) and rate capabilities (50-100C).
• Attained high energy densities (340.7 Wh kg-1) and fast-charging properties in full cells.

Conclusions:

• Ferroelectric-magnetic synergistic effects offer a novel strategy for improving sodium-ion battery performance.
• This approach enables superfast and stable sodium storage by optimizing the electrode-electrolyte interface.
• Paves the way for designing advanced electrode materials for next-generation secondary batteries.