All-Inorganic Flexible Embedded Thin-Film Capacitors for Dielectric Energy Storage with High Performance

Area of Science:

• Materials Science
• Electrical Engineering
• Energy Storage

Background:

• Dielectric capacitors are crucial passive components in flexible electronics for energy storage.
• Current flexible capacitors face challenges in flexibility, integration, and miniaturization.
• Developing robust dielectric films is essential for advanced flexible electronic applications.

Purpose of the Study:

• To develop all-inorganic flexible dielectric film capacitors for enhanced energy storage.
• To evaluate the energy density, efficiency, and mechanical stability of these flexible capacitors.
• To assess the performance of flexible capacitors across a wide temperature range.

Main Methods:

• Fabrication of all-inorganic flexible dielectric film capacitors.
• Measurement of recoverable energy density (Wrec) and energy efficiency (η).
• Testing of mechanical bending durability (10^4 cycles, 4 mm curvature radius) and charge-discharge cycling stability (10^6 cycles).
• Evaluation of performance across a temperature range of -120 to 150 °C.

Main Results:

• Achieved a desirable recoverable energy density (Wrec) of 40.6 J/cm³ and energy efficiency (η) of 68.9%.
• Demonstrated no obvious deterioration in Wrec and η after 10^4 mechanical bending cycles and under a 4 mm bending radius.
• Showcased outstanding stability over 10^6 charge-discharge cycles.
• Confirmed proper functionality from -120 to 150 °C with Wrec > 15 J/cm³ and η > 70%.

Conclusions:

• The developed all-inorganic flexible dielectric film capacitors exhibit excellent energy storage performance.
• These capacitors demonstrate remarkable mechanical flexibility and cycling stability.
• Their wide operating temperature range makes them highly suitable for microenergy storage in flexible electronics.