A novel approach to enhancing energy storage density and efficiency has emerged from research on multilayer ceramic capacitors (MLCCs), traditionally limited by their low capacities compared to electrochemical capacitors. Researchers have implemented interlaminar strain engineering to improve the performance of these devices significantly.
The goal of this advancement is to bridge the gap between the high energy storage density and energy efficiency levels needed for advanced power electronics. The study reports breakthroughs with the multilayer structures composed of different antiferroelectric ceramics, such as (Pb0.9Ba0.04La0.04)(Zr0.65Sn0.3Ti0.05)O3, achieving as much as 22.0 J cm−3 recoverable energy density and 96.1% energy efficiency.
Researchers explained the core of this innovation. They pointed out, "A colossal recoverable energy density of 22.0 J cm−3, the highest value in MLCCs with efficiency surpassing 95% (96.1% of our specimen), is achieved." This performance surpasses previous benchmarks, representing more than five times the previously highest recoverable energy density.
The approach relies on creating a heterogeneous layer structure, where layers of different antiferroelectric compositions are laminated together. This configuration utilizes the electrostrictive effect to tune the domain structures effectively, manipulating the polarization characteristics of the dielectric materials to yield lower hysteresis losses.
Consequently, the MLCCs fabricated with this technology demonstrate significant stability across various temperatures and frequencies, meeting strict criteria for high-performance electronics. The authors note, "This work defines clear interlaminar strain engineering guidelines for MLCCs to pursue supreme overall energy storage performance." This guideline could propel the future development of capacitor technology.
The achievement of such high energy storage density and efficiency holds considerable promise for advancements in power technologies, especially where rapid energy discharge is required, such as electric vehicles and high-capacity energy applications.
Overall, the findings provide not only significant performance improvements for MLCCs but also set the foundation for future innovations aimed at addressing energy storage demands in the electronics sphere.