Multi-Polar Order Engineering Enables Near-Ideal Efficiency in Lead-Free Energy Storage Perovskite

Area of Science:

• Materials Science
• Solid State Physics
• Electrochemistry

Background:

• Lead-based dielectrics are essential for high-performance capacitors but pose environmental and supply chain risks.
• Developing lead-free alternatives with comparable or superior performance is critical for sustainable energy storage.

Purpose of the Study:

• To engineer an industrially scalable, lead-free perovskite for advanced capacitors.
• To achieve simultaneous record-breaking energy efficiency and density.
• To establish a sustainable pathway for grid-scale power electronics.

Main Methods:

• Multi-polar order engineering and phase-field simulations for micro-to-nano domain design.
• Sub-angstrom electronic state optimization, including synchrotron X-ray absorption spectroscopy (XAS).
• Atomic-resolution electron microscopy and dielectric relaxation time (DRT) analysis.

Main Results:

• Achieved record efficiency (η ≈ 95%) and energy density (12 J cm^-3) in a lead-free perovskite.
• Demonstrated ultrafast field response (<32 ns discharge) and excellent thermal resilience (±4% current fluctuation, 25-150 °C).
• Hierarchical control of atomic-to-electronic structure enabled unified charge dynamics.

Conclusions:

• The developed lead-free perovskite offers a sustainable and cost-effective alternative to lead-based dielectrics.
• This material eliminates reliance on rare-earth precursors, mitigating environmental impact.
• The findings pave the way for next-generation, high-performance, and eco-friendly energy storage solutions.