Work

Dual‐Phase In Situ Symbiosis Structures for Ultrahigh Capacitive Energy Storage

Year: 2026

Type: article

Abstract: Dielectric capacitors, known for their high‐power density and reliability, are key components in advanced electronics and electrical systems. However, the trade‐off between polarization and breakdown strength in dielectric materials has significantly limited the improvement of energy storage density. In this work, a dual‐phase structure is engineered in situ through phase separation to tackle this issue. Our results demonstrated that by introducing Hf into BaBi 4 Ti 4 O 15 ferroelectrics, a linear‐like pyrochlore phase with high breakdown strength and low hysteresis loss is induced. Moreover, the phase ratio between the BaBi 4 Ti 4 O 15 and pyrochlore phases can be effectively controlled by adjusting the Hf content. As a result, this dual‐phase in situ symbiosis structures exhibits simultaneously high polarization, low hysteresis loss, and high breakdown strength. Consequently, an ultrahigh energy density of 132.4 J cm −3 with an efficiency of 76% at a relatively low electric field of 4.9 MV cm −1 is achieved. This study highlights that the in situ construction of a dual‐phase structure via Hf doping provides a simple and effective approach to optimizing the energy storage properties of dielectric capacitors.

Source: Energy & environment materials

DOI: 10.1002/eem2.70281

Authors: Ying Zhang, Dongpo Song, Yan Lei, Jie Yang, Bingbing Yang

Institutions: Jiangsu University of Science and Technology, Chinese Academy of Sciences, Institute of Solid State Physics

Language: English

Topic: Ferroelectric and Piezoelectric Materials

Subfield: Materials Chemistry

Field: Materials Science

Domain: Physical Sciences

SDGs: Affordable and clean energy, Industry, innovation and infrastructure

Open Access status: hybrid

Estimated APC paid: $3,000