Zhongqian Lv , Bing Han , Zhen Liu , Shaobo Guo , Kai Dai , Fei Cao , Zhigao Hu , Genshui Wang
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引用次数: 0
Abstract
Dielectric capacitors are widely utilized in large-scale power systems, including applications in medical and military fields. However, their relatively low energy storage density limits further advancements in miniaturization and integration. Therefore, improving the energy storage density of dielectric capacitors is of paramount importance. In this work, novel lead-free Na0.70Sr0.15Nb0.75Ta0.25O3 (NSNT) ceramics were designed, which exhibit a unique combination of relaxor ferroelectric (FE) N phase and stabilized antiferroelectric (AFE) P phase, as confirmed through local structural analysis. The competing FE/AFE phase coexistence is attributed to the discrepancy in ion valence and radius. As a result, the NSNT ceramics demonstrate exceptional energy storage performance, featuring a recoverable energy density (Wrec) of 10.45 J/cm³ and an energy efficiency (η) of 83.0 % at 850 kV/cm, along with excellent stability. These outstanding energy storage properties not only confirm the promising application prospects of NN-based ceramics with competing FE/AFE phase coexistence, but also provide an innovative approach for advancing high-performance ceramic capacitors.
期刊介绍:
Energy Storage Materials is a global interdisciplinary journal dedicated to sharing scientific and technological advancements in materials and devices for advanced energy storage and related energy conversion, such as in metal-O2 batteries. The journal features comprehensive research articles, including full papers and short communications, as well as authoritative feature articles and reviews by leading experts in the field.
Energy Storage Materials covers a wide range of topics, including the synthesis, fabrication, structure, properties, performance, and technological applications of energy storage materials. Additionally, the journal explores strategies, policies, and developments in the field of energy storage materials and devices for sustainable energy.
Published papers are selected based on their scientific and technological significance, their ability to provide valuable new knowledge, and their relevance to the international research community.