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Ultrahigh capacitive energy storage in BNT-based polymorphic relaxor ceramics with dense microstructure and core-shell structure 认领 引用
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作者 Changbai Long Ziqian Su +9 位作者 Yang Zhang Zhengwang He Xiaoyang Jiao Kuntong Zhang Fenglong Li Wei Ren Fei Li Laijun Liu Haijun Wu Xiangdong Ding 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2026年第5期832-842,I0020,共11页
The exploration of eco-friendly dielectric ceramics for electric energy storage has drawn increasing interest due to their wide applications in high/pulsed power electronic systems.However,achieving ultrahigh recovera... The exploration of eco-friendly dielectric ceramics for electric energy storage has drawn increasing interest due to their wide applications in high/pulsed power electronic systems.However,achieving ultrahigh recoverable energy storage density(Wrec≥8 J/cm3)with ultrahigh efficiency(η≥90%)is still a huge challenge for them,restricting the development of ceramic-based energy storage capacitors.Here,comprehensive outstanding energy storage performance is realized in lead-free Bi0.5Na0.5TiO3(BNT)-based ceramics due to collaborative optimization of complex ion doping and viscous polymer process(VPP).Highly dynamic polar nanoregions(PNRs)with the coexistence of rhombohedral(R)+tetragonal(T)phases are formed by Nd3+/Hf4+/Mg2+co-doping at both A and B sites of(Bi0.05Na0.05)0.94Ba0.06TiO3.This,together with the construction of a core-shell structure,ensures a large polarization difference under moderate external electric fields.Furthermore,the optimum composition prepared by VPP exhibits a significant enhancement in dielectric breakdown strength due to its dense microstructure with ultrafine grains and low-concentration defects(e.g.,oxygen vacancies).As a result,excellent energy storage performance with ultrahigh Wrec≈9.38 J/cm3andη≈94.4%is realized in highly dense polymorphic relaxor ceramics under a large electric field of 480 kV/cm.This work provides a two-step cooperative optimization strategy to design advanced ceramic-based dielectric capacitors with great potential for practical energy storage applications. 展开更多
关键词 Lead-free energy storage ceramic capacitors Polar nanoregions(PNRs) Multiphase coexistence Core-shell structure Viscous polymer process(VPP)
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自愈合聚氨酯的研究进展及其在柔性传感领域的应用 认领 引用 被引量：2
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作者 陈超 王古月 +4 位作者 田莹 孔正阳 李凤龙 朱锦 应邬彬 《化学进展》 SCIE CAS CSCD 北大核心 2023年第9期1275-1293,共19页
聚氨酯是一类常见的聚合物,因其具有出色的综合性能而受到了广泛关注。但是,对于聚氨酯而言,任何微小的损坏都会极大地缩短其使用寿命。因此,可以通过赋予聚氨酯自愈合性能来解决这一问题。聚氨酯的愈合机理中最常见的是内在驱动力,指... 聚氨酯是一类常见的聚合物,因其具有出色的综合性能而受到了广泛关注。但是,对于聚氨酯而言,任何微小的损坏都会极大地缩短其使用寿命。因此,可以通过赋予聚氨酯自愈合性能来解决这一问题。聚氨酯的愈合机理中最常见的是内在驱动力,指的是通过分子结构设计,不需要外加愈合剂,使得聚氨酯的分子链自发运动重新缠结在一起。内在驱动通常分为可逆共价键(如二硫键、Diels-Alder反应、硼酸酯键等)和动态非共价相互作用(如氢键、离子键、金属配位键、主客体结构等)。聚氨酯主链中可以存在单一的内在驱动力,也可以同时存在多个内在驱动力共同作用。然而,自愈合聚氨酯仅仅具有自发修复损伤,延长其使用寿命并降低维护成本的这一优点仍不能满足聚氨酯在一些特殊场合的使用需求。为了进一步实现自愈合聚氨酯多场景的应用,在保留聚氨酯的自愈合性能的同时,考虑引入一些新的官能团,赋予聚氨酯一些特殊性能,如形状记忆、可降解、抗菌、生物相容等,实现自愈合聚氨酯的功能化集成。更重要的是,这些具有功能化的自愈合聚氨酯可以代替传统材料,作为柔性传感领域中的介电材料、基底材料或者封装材料,用于提高柔性传感器的可靠性和耐久性。因此,本文重点介绍了自愈合聚氨酯的自愈合机理,随后介绍了自愈合聚氨酯的功能化集成以及其在柔性传感领域的应用,最后在此基础上展望了自愈合聚氨酯的未来发展前景。 展开更多
关键词 自愈合聚氨酯 可逆共价键 动态非共价相互作用 功能化自愈合聚氨酯 柔性传感器
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High energy storage performance in the Bi0.5Na0.5TiO3-BaTiO3-Nd(Mg1/2Hf1/2)O3 ternary system with multiscale polymorphic domains and local heterogeneous structure 认领 引用 被引量：4
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作者 Changbai Long Ziqian Su +6 位作者 Anwei Xu Fenglong Li Yang Li Wei Ren Haijun Wu Xiangdong Ding Laijun Liu 《Journal of Advanced Ceramics》 SCIE EI CAS CSCD 2025年第4期163-175,共13页
Lead-free dielectric relaxor ferroelectric(RFE)ceramics are one of the promising materials for dielectric energy storage applications.However,the contradiction between high polarization and low hysteresis leads to int... Lead-free dielectric relaxor ferroelectric(RFE)ceramics are one of the promising materials for dielectric energy storage applications.However,the contradiction between high polarization and low hysteresis leads to interior energy storage performance,which greatly limits their applications in high/pulsed power systems.Here,we propose an effective strategy to significantly improve the energy storage properties of 0.94Bi0.5Na0.5TiO3-0.06BaTiO3(0.94BNT-0.06BT)with a morphotropic phase boundary(MPB)composition by constructing multiscale polymorphic domains and local heterogeneous structures.The introduction of Nd(Mg1/2Hf1/2)O3(NMH)facilitates the formation of short-range ordered polar nanoregions(PNRs).Moreover,small amounts of nanodomains with high polarization are resulted from local heterogeneous structures with Bi-and Ti-rich regions.Multiscale polymorphic domains with the coexistence of rhombohedraletragonal(R+T)nanodomains and PNRs ensure both high polarization and low hysteresis,which is crucial for improving the energy storage performance.Furthermore,the excellent electrical insulation is resulted from the high insulation resistivity,grain size at the submicron scale and a wide band gap by NMH doping.Therefore,a high recoverable energy density(Wrec)of 7.82 J/cm3 with an ultrahigh efficiency(η)of 93.1%is realized in the designed BNT-BT-NMH ternary system because of both a largeΔP and high Eb.These findings,together with good temperature/frequency/cycling stability,indicate that the optimum composition ceramics are very promising materials for energy storage applications in high/pulsed power systems. 展开更多
关键词 lead-free dielectric capacitors Bi0.5Na0.5TiO3(BNT)-based ceramics energy storage performance multiscale polymorphic domains local heterogeneous structure dielectric breakdown electric strength
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