Significantly enhanced recoverable energy storage density in potassium–sodium niobate-based lead free ceramics

Yang, Zetian; Du, Hongliang; Qu, Shaobo; Hou, Yudong; Ma, Hua; Wang, Jiafu; Wang, Jun; Wei, Xiaoyong; Wang, Chao

doi:10.1039/c6ta04107h

Cited by 441 publications

(178 citation statements)

References 53 publications

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“…When x exceeds 0.75, the anomalies in the ε r ‐ T curves disappear. Considering the single diffraction peak (Figure B) and the absence of piezoelectricity (Figure 6A), we deduce that the ceramics for x ≥ 0.8 possess a cubic phase structure …”

Section: Resultsmentioning

confidence: 88%

“…Considering the single diffraction peak ( Figure 1B) and the absence of piezoelectricity ( Figure 6A), we deduce that the ceramics for x ≥ 0.8 possess a cubic phase structure. 21 Figure 2O displays the variations of T R-T with the La 3+ content; it clearly shows three stages (marked as I, II, and III): in stage I, T R-T rapidly increases at the speed of 19°C/ 0.1 mol, in stage II, it slowly increases at the speed of 2.55°C/0.1 mol, and finally disappears at stage III. This interesting phenomenon can be attributed to the highly similar ion radii between La 3+ and Bi 3+ , and observations made can be interpreted as follows: in stage I, the crystal lattice, which initially does not contain any La 3+ , strongly responds to the addition of La 3+ , resulting in an significant increase of T R-T ( Figure 2O).…”

Section: Et Almentioning

confidence: 99%

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Temperature stability and electrical properties in La‐doped KNN‐based ceramics

Zhu

et al. 2018

J Am Ceram Soc

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To improve the temperature stability and electrical properties of KNN‐based ceramics, we simultaneously consider the phase boundary and the addition of rare earth element (La), 0.96K0.5Na0.5Nb0.96Sb0.04O3‐0.04(Bi1‐xLax)0.5Na0.5ZrO3 (0 ≤ x ≤ 1.0) ceramics. More specifically, we investigate how the phase boundary and the addition of La3+ affect the phase structure, electrical properties, and temperature stability of the ceramic. We show that increasing the La3+ content leads to a change in phase structure, from a rhombohedral‐tetragonal (R‐T) phase coexistence to a cubic phase. More importantly, we show that the appropriate addition of La3+ (x = 0.2) can simultaneously improve the unipolar strain (from 0.127% to 0.147%) and the temperature stability (i.e., the unipolar strain of 0.147% remains unchanged when T is increased from 25 to 80°C). In addition, we find that the ceramics with x = 0.2 exhibit a large piezoelectric constant (d33) of ~430 pC/N, a high Curie temperature (TC) of ~240°C and a fatigue‐free behavior (after 106 electric cycles). The enhanced electrical properties mostly originate from the easy domain switching, whereas the improved temperature stability can be attributed to the R‐T phase boundary and the appropriate addition of La3+.

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Section: Resultsmentioning

confidence: 88%

Section: Et Almentioning

confidence: 99%

Temperature stability and electrical properties in La‐doped KNN‐based ceramics

Zhu

et al. 2018

J Am Ceram Soc

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“…Currently the mainstream RFE materials for energy storage are PbTiO 3 -based ceramics because of their high dielectric permittivity and strong polarization 8 . Yet bulk ceramics bear low breakdown strengths ( E b , the highest electric field a dielectric can sustain) due to the massive structural defects like pores and impurities, which hamper the realization of high energy density 9 . Recently, RFE thin films have been attracting increasing attention, where large E b of >1 MV cm −1 is achievable owing to the improvement of film quality.…”

Section: Introductionmentioning

confidence: 99%

Giant energy density and high efficiency achieved in bismuth ferrite-based film capacitors via domain engineering

et al. 2018

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Developing high-performance film dielectrics for capacitive energy storage has been a great challenge for modern electrical devices. Despite good results obtained in lead titanate-based dielectrics, lead-free alternatives are strongly desirable due to environmental concerns. Here we demonstrate that giant energy densities of ~70 J cm−3, together with high efficiency as well as excellent cycling and thermal stability, can be achieved in lead-free bismuth ferrite-strontium titanate solid-solution films through domain engineering. It is revealed that the incorporation of strontium titanate transforms the ferroelectric micro-domains of bismuth ferrite into highly-dynamic polar nano-regions, resulting in a ferroelectric to relaxor-ferroelectric transition with concurrently improved energy density and efficiency. Additionally, the introduction of strontium titanate greatly improves the electrical insulation and breakdown strength of the films by suppressing the formation of oxygen vacancies. This work opens up a feasible and propagable route, i.e., domain engineering, to systematically develop new lead-free dielectrics for energy storage.

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“…High‐energy density, environmentally friendly, and low‐cost energy storage devices are in high demand due to growing environmental problems and the rapid development of renewable energy generation . Multilayer energy storage ceramic capacitors (MLESCCs) are fabricated with hundreds of thin dielectric layers arranged in parallel with alternating interlayer metal electrodes.…”

Section: Introductionmentioning

confidence: 99%

“…High-energy density, environmentally friendly, and lowcost energy storage devices are in high demand due to growing environmental problems and the rapid development of renewable energy generation. [1][2][3] Multilayer energy storage ceramic capacitors (MLESCCs) are fabricated with hundreds of thin dielectric layers arranged in parallel with alternating interlayer metal electrodes. This structure leads to a very high volumetric capacitance, and the MLESCCs are suitable for surface-mount electronics with superior mechanical and thermal properties.…”

Section: Introductionmentioning

confidence: 99%

Grain‐size–dependent dielectric properties in nanograin ferroelectrics

et al. 2018

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A series of ferroelectric ceramic models with grain and grain‐boundary structures of different sizes are established via Voronoi tessellations. A phase‐field model is introduced to study the dielectric breakdown strength of these ferroelectric ceramics. Afterward, the relation between the electric displacement and electric field and the hysteresis loop are calculated using a finite element method based on a classical and modified hyperbolic tangent model. The results indicate that as the grain size decreases, the dielectric strength is enhanced, but the dielectric permittivity is reduced. The discharge energy density and energy storage efficiency of these ferroelectric ceramics extracted from the as‐calculated hysteresis both increase along with a decrease in their grain size at their breakdown points. However, under the same applied electric field, the ferroelectric ceramic with a smaller grain size possesses a lower discharge energy density but a higher energy storage efficiency. The results suggest that ferroelectric ceramics with smaller grain sizes possess advantages for applications in energy storage devices.

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Significantly enhanced recoverable energy storage density in potassium–sodium niobate-based lead free ceramics

Abstract: The findings in this study could broaden the applications of KNN materials in a new field.

Cited by 441 publications

References 53 publications

Temperature stability and electrical properties in La‐doped KNN‐based ceramics

Temperature stability and electrical properties in La‐doped KNN‐based ceramics

Giant energy density and high efficiency achieved in bismuth ferrite-based film capacitors via domain engineering

Grain‐size–dependent dielectric properties in nanograin ferroelectrics

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