Work

Strain‐Adaptive Dielectric Metamaterials via Bioinspired “Ligament‐Bone” Architecture for Ultrahigh‐Energy Capacitive Storage

Year: 2026

Type: article

Abstract: ABSTRACT Polymer dielectrics for capacitive energy storage face fundamental trade‐offs between breakdown strength, energy density, efficiency, and mechanical robustness. Herein, we break this paradigm by designing a bioinspired strain‐adaptive dielectric metamaterial with a multiscale “ligament‐bone” architecture. The “ligament” phase epoxy‐functionalized polyvinylidene fluoride‐based polymer provides dynamic constraints to suppress ferroelectric loss, while the “bone” units, alumina‐coated barium titanate nanocores (Al 2 O 3 @BaTiO 3 ), engineered with a strain‐responsive “periosteum” shell, mitigate interfacial distortion and carrier migration. This hierarchical design synergistically enables unprecedented electro‐mechanical properties: a record‐high energy density of 26.1 J cm −3 with 90.2% efficiency at 600 MV m −1 , coupled with a Young's modulus of 2.13 GPa. Operando characterizations and multiscale simulations reveal that strain‐adaptive reconfiguration of polymer chains and core‐shell interfaces dynamically optimizes field/charge distribution under extreme conditions. This biomimetic strategy establishes a universal framework for designing next‐generation dielectrics for extreme‐condition electronics.

Source: Advanced Science

DOI: 10.1002/advs.76253