High energy density in silver niobate ceramics

Author(s): Ye Tian ¹ ^, ² ^, ³ ^, ⁴ ^, ⁵ , Li Jin ¹ ^, ² ^, ³ ^, ⁴ ^, ⁵ , Hangfeng Zhang ⁶ ^, ⁷ ^, ⁸ ^, ⁹ , Zhuo Xu ¹ ^, ² ^, ³ ^, ⁴ ^, ⁵ , Xiaoyong Wei ¹ ^, ² ^, ³ ^, ⁴ ^, ⁵ , E. D. Politova ¹⁰ ^, ¹¹ ^, ¹² , S. Yu. Stefanovich ¹⁰ ^, ¹¹ ^, ¹² ^, ¹³ ^, ¹⁴ , Nadezda V. Tarakina ¹⁵ ^, ⁷ ^, ⁸ ^, ⁹ , Isaac Abrahams ⁶ ^, ⁷ ^, ⁸ ^, ⁹ , Haixue Yan ¹⁵ ^, ⁷ ^, ⁸ ^, ⁹

Publication date (Electronic): 2016

Journal: Journal of Materials Chemistry A

Publisher: Royal Society of Chemistry (RSC)

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Abstract

Solid-state dielectric energy storage is the most attractive and feasible way to store and release high power energy compared to chemical batteries and electrochemical super-capacitors.

Abstract

Solid-state dielectric energy storage is the most attractive and feasible way to store and release high power energy compared to chemical batteries and electrochemical super-capacitors. However, the low energy density ( ca. 1 J cm ⁻³) of commercial dielectric capacitors has limited their development. Dielectric materials showing field induced reversible phase transitions have great potential to break the energy storage density bottleneck. In this work, dense AgNbO ₃ ceramic samples were prepared successfully using solid state methods. Ferroelectric measurements at different temperatures reveal evidence of two kinds of polar regions. One of these is stable up to 70 °C, while the other remains stable up to 170 °C. The associated transition temperatures are supported by second harmonic generation measurements on poled samples and are correlated with the occurrence of two sharp dielectric responses. The average unit cell volume is seen to increase with increasing DC field and has been interpreted in terms of increasing levels of structural disorder in the system. At a high electric field the structure becomes ferroelectric with high polarization. This field induced transition exhibits a recoverable energy density of 2.1 J cm ⁻³, which represents one of the highest known values for lead-free bulk ceramics.

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Flexible high-temperature dielectric materials from polymer nanocomposites.

Qi-Wei Li, Lei Chen, Matthew Gadinski … (2015)

Dielectric materials, which store energy electrostatically, are ubiquitous in advanced electronics and electric power systems. Compared to their ceramic counterparts, polymer dielectrics have higher breakdown strengths and greater reliability, are scalable, lightweight and can be shaped into intricate configurations, and are therefore an ideal choice for many power electronics, power conditioning, and pulsed power applications. However, polymer dielectrics are limited to relatively low working temperatures, and thus fail to meet the rising demand for electricity under the extreme conditions present in applications such as hybrid and electric vehicles, aerospace power electronics, and underground oil and gas exploration. Here we describe crosslinked polymer nanocomposites that contain boron nitride nanosheets, the dielectric properties of which are stable over a broad temperature and frequency range. The nanocomposites have outstanding high-voltage capacitive energy storage capabilities at record temperatures (a Weibull breakdown strength of 403 megavolts per metre and a discharged energy density of 1.8 joules per cubic centimetre at 250 degrees Celsius). Their electrical conduction is several orders of magnitude lower than that of existing polymers and their high operating temperatures are attributed to greatly improved thermal conductivity, owing to the presence of the boron nitride nanosheets, which improve heat dissipation compared to pristine polymers (which are inherently susceptible to thermal runaway). Moreover, the polymer nanocomposites are lightweight, photopatternable and mechanically flexible, and have been demonstrated to preserve excellent dielectric and capacitive performance after intensive bending cycles. These findings enable broader applications of organic materials in high-temperature electronics and energy storage devices.