A Cross-Linked Flexible Metaferroelectrolyte Regulated by 2D/2D Perovskite Heterostructures for High-Performance...

Area of Science:

• Materials Science
• Electrochemistry
• Solid-State Batteries

Background:

• Solid-state electrolytes face challenges with ionic conductivity and interface stability at lower temperatures.
• Developing robust solid-state electrolytes is crucial for advanced battery technologies.

Purpose of the Study:

• To engineer flexible ferroelectric composite electrolytes for solid-state sodium batteries (SSBs).
• To improve ionic conductivity and interface stability at room and low temperatures.

Main Methods:

• Utilized a strategy involving sodium-rich anti-perovskite (NaRAP)/ferroelectric perovskite heterostructures.
• Developed PVDF-based metaferroelectrolytes with Na2.99Ba0.005OCl/Ca2Na2Nb5O16- (CNNO-) nanosheets in a PVDF-HFP matrix.
• Employed an in situ cross-linking and spontaneous bridging method.

Main Results:

• The optimized metaferroelectrolyte (PH-5% NC) showed rapid ion transport (1.11 × 10-4 S cm-1 at 25 °C) and a wide electrochemical window (>4.8 V).
• Demonstrated inhibited sodium dendrite growth and superior mechanical properties including flexibility and elasticity.
• Achieved stable cycling performance in Na3V2(PO4)3/PH-5% NC/Na batteries, even at 0 °C (56.4 mAh g-1 after 500 cycles at 1 C).

Conclusions:

• The developed ferroelectric composite electrolyte offers a promising solution for safe, stable, and compact SSB energy storage.
• The metaferroelectrolyte strategy significantly enhances performance, potentially surpassing current commercial sodium-ion batteries.
• This approach paves the way for high-energy-density solid-state batteries with improved safety features.