Perovskite Srx(Bi1-xNa0.97-xLi0.03)0.5TiO3 ceramics with polar nano regions for high power energy storage
Perovskite Srx(Bi1-xNa0.97-xLi0.03)0.5TiO3 ceramics with polar nano regions for high power energy storage
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DOI：
10.1016/j.nanoen.2018.06.016
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发表时间：
2018-08-01
期刊：
影响因子：
17.6
通讯作者：
Yan, Haixue
中科院分区：
文献类型：
--
作者：
Wu, Jiyue;Mahajan, Amit;Yan, Haixue
介质电容器在大功率储能方面具有很大的吸引力。然而，这些电容器的能量密度较低，这主要是受介质材料的限制，这仍然是制约其应用的瓶颈。本文采用固相反应法制备了无铅单相钙钛矿结构的SRX(Bi1-xNa0.97-xLi0.03)(0.5)TiO3(x=0.30和0.38)块体陶瓷，并对其介电性能进行了研究。在这种材料中，利用A位的共取代创建了极性纳米区域(PNR)，以实现低剩余极化(P-r)和高最大极化(P-max)的弛豫行为。此外，由于电场诱导了纳米区域内的可逆相变，P-max进一步增加。进行了全面的结构和电学研究，以确认PNRs和可逆相变。利用PNR的场诱导转动和PNR相关的可逆转变，获得了高能量密度(1.70J/cm(3))和高效率(87.2%)，使其成为性能最好的高储能无铅介质陶瓷块体材料之一。
Dielectric capacitors are very attractive for high power energy storage. However, the low energy density of these capacitors, which is mainly limited by the dielectric materials, is still the bottleneck for their applications. In this work, lead-free single-phase perovskite Srx(Bi1-xNa0.97-xLi0.03)(0.5)TiO3 (x = 0.30 and 0.38) bulk ceramics, prepared using solid-state reaction method, were carefully studied for the dielectric capacitor application. Polar nano regions (PNRs) were created in this material using co-substitution at A-site to enable relaxor behaviour with low remnant polarization (P-r) and high maximum polarization (P-max). Moreover, P-max was further increased due to the electric field induced reversible phase transitions in nano regions. Comprehensive structural and electrical studies were performed to confirm the PNRs and reversible phase transitions. And finally a high energy density (1.70 J/cm(3)) with an excellent efficiency (87.2%) was achieved using the contribution of field-induced rotations of PNRs and PNR-related reversible transitions in this material, making it among the best performing lead-free dielectric ceramic bulk material for high energy storage.