Enhanced Energy Storage Performance of AgNbO3/PVDF/PMMA Composites with Optimized PVDF Content

Antiferroelectric ceramics are attractive for energy storage applications due to their high energy storage density and efficiency. However, the performance of antiferroelectric ceramic-polymer composites can be limited by particle aggregation. This study focuses on enhancing the energy storage performance of AgNbO3/PVDF/PMMA composites by optimizing the PVDF content and modifying the AgNbO3 filler with a silane coupling agent (KH550).

The research systematically investigates the structure, dielectric properties, and energy storage properties of the composites. Results indicate that hydrogen bonds formed between PVDF and PMMA lead to strong interfacial adhesion, with optimal compatibility achieved at a PVDF mass fraction of 30 wt%. The addition of silane-modified AgNbO3 filler further improves the composite's performance.

Notably, the AgNbO3/PVDF/PMMA composites exhibit a remarkable breakdown strength of 430 kV mm-1 and a high energy storage density of 14.35 J cm-3. This enhanced performance is attributed to the synergistic effect of the antiferroelectric AgNbO3 filler, the optimized PVDF content, and the strong interfacial bonding between the polymer matrix and the filler particles. These findings highlight the potential of AgNbO3/PVDF/PMMA composites for use in advanced energy storage devices.