Heterovalent-doping-enabled atom-displacement fluctuation leads to ultrahigh energy-storage density in AgNbO3-based multilayer capacitors

Abstract

Dielectric capacitors with high energy storage performance are highly desired for next-generation advanced high/pulsed power capacitors that demand miniaturization and integration. However, the poor energy-storage density that results from the low breakdown strength, has been the major challenge for practical applications of dielectric capacitors. Herein, we propose a heterovalent-doping-enabled atom-displacement fluctuation strategy for the design of low-atom-displacements regions in the antiferroelectric matrix to achieve the increase in breakdown strength and enhancement of the energy-storage density for AgNbO3-based multilayer capacitors. An ultrahigh breakdown strength ~1450 kV·cm−1 is realized in the Sm0.05Ag0.85Nb0.7Ta0.3O3 multilayer capacitors, especially with an ultrahigh Urec ~14 J·cm−3, excellent η ~ 85% and PD,max ~ 102.84 MW·cm−3, manifesting a breakthrough in the comprehensive energy storage performance for lead-free antiferroelectric capacitors. This work offers a good paradigm for improving the energy storage properties of antiferroelectric multilayer capacitors to meet the demanding requirements of advanced energy storage applications.

Local Chemical Clustering Enabled Ultrahigh Capacitive Energy Storage in Pb-Free Relaxors

“…Accordingly, there are very few systems reported with W rec > 15 J cm –3 , while their corresponding η are only about 80%. − As compared with these highly efficient (η > 90%) dielectric bulk ceramics, BNT-25BT- x NN ( x = 0.12) exhibits much higher W rec . In addition, this performance is superior to the reported multilayer ceramic capacitors, which are typically fabricated with a much smaller thickness (<20 μm). ,,, …”

“…In addition, this performance is superior to the reported multilayer ceramic capacitors, which are typically fabricated with a much smaller thickness (<20 μm). 15,16,27,28 Further, x = 0.12 exhibits excellent stability in frequency and temperature as well as remarkable resistance to fatigue (Figure S14). Over a broad frequency range of 10−200 Hz, the ceramic displays a lack of frequency dependence, with a nearly constant W rec value of 7.4 ± 0.1 J cm −3 and a variation in η of less than 1.6%.…”

“…The pressing demand for sustainable and efficient energy storage systems is propelled by their diverse applications, ranging from electric vehicles to microelectronics and beyond. − Dielectric capacitors are optimal energy storage systems characterized by their ultrahigh power density, ultrafast charging/discharging rates, high-voltage endurance, and exceptional reliability, and in particular, being core components in high/pulse power technologies. − However, the use of dielectric capacitors is presently limited by their low energy storage density, especially in situations requiring large capacitances and compact packaging sizes. Consequently, there has been a surge of attention toward developing dielectric capacitors with high energy density and high storage efficiency (“dual high”). − …”

Giant comprehensive capacitive energy storage in lead-free quasi-linear relaxor ferroelectrics via local heterogeneous polarization configuration

“…A dielectric-based solid-state capacitor, as a kind of passive component in electronics, shows distinctive features of higher power density (∼10 4 to 10 5 W kg −1 ) and faster charging/discharging character (∼μs) and possesses great prospects in the electrical vehicle and pulsed power application fields. 1–3 Considering the manufacturing cost and lifetime reliability in practical applications for dielectric capacitors, a ceramic dielectric capacitor is, therefore, emerging as a key enabler for competitive energy storage materials, particularly for the process of industrialization owing to its mature/simple production process and low cost. 4,5 Especially driven by sustainable development and the urgency of environmental protection, lead-free dielectric capacitors have drawn widespread interest.…”

Porous nanosheet–nanosphere@nanosheet FeNi2-LDH@FeNi2S4 core–shell heterostructures for asymmetric supercapacitors

“…1–3 Currently, fuel cells, lithium batteries and capacitors are widely used as simple energy storage devices. 4–6 Supercapacitors (SCs), energy storage elements sharing certain properties of electrostatic capacitors and batteries, exhibit excellent pulse charge and discharge, as well as large capacity. Compared with ordinary capacitors and batteries, SCs have been actively investigated owing to their high power density ( P d ), long service life, high charging rate, and superior low-temperature performance.…”