Superior energy storage performance via engineering crossover region with competing orders in high-entropy multilayer capacitors.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 41673390.
- Also identified by DOI 10.1038/s41467-026-69279-2 and PMC identifier 13004956.
- Licence recorded as CC BY-NC-ND.
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Abstract
As promising candidates for next-generation energy storage devices in electrical and electronic systems, lead-free multilayer ceramic capacitors face increasingly high performance requirements. To counteract the usual trade-off between energy storage density and efficiency, we here propose a high-entropy design that directly harnesses diverse oxide symmetries to targetedly engineer competing orders and tune the composition into the crossover region between relaxor ferroelectric and superparaelectric states. Atomic-scale structural analysis reveals high-entropy ceramic develops pronounced local polarization fluctuation and dispersed oxygen octahedral rotations, which enhance relaxor behavior and reduce switching barrier. Consequently, superior recoverable energy density of 20.64 J cm<sup>-3</sup> and high efficiency of 94.2% are obtained in our designed high-entropy Bi<sub>0.5</sub>Na<sub>0.5</sub>TiO<sub>3</sub>-based multilayer ceramic capacitors, along with excellent thermal/anti-fatigue stability and charge-discharge capabilities. This work provides a transferable strategy to engineer competing orders in lead-free dielectric materials and successfully achieves high-entropy multilayer ceramic capacitors with superior energy storage performance.