Realizing high energy density and discharge energy density in high hardness Ba1.938Bi0.375Nb5O15-based glass ceramics

Chen, Chao; Zhang, Shuren; Li, Bo

doi:10.1016/j.ceramint.2023.10.143

Cited by 2 publications

(1 citation statement)

References 69 publications

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“…It is noteworthy that the sample consistently exhibits slender P–E loops thanks to its robust thermal stability, the decrease in W rec and η remains below 3 and 4%, respectively, throughout the tested temperature range. In Figure i, a comparison of W rec and η between KBBNTP-2T GCs and various other tungsten bronze ceramics and glass ceramics is presented. − ,− Figure S13 also shows the stability of the KBBNTP-2T GCs sample in terms of different frequencies and cycle numbers. It can be seen that this sample shows a certain degree of stability.…”

Section: Resultsmentioning

confidence: 99%

Engineering Phase Separation in Niobate Glass through Ab Initio Molecular Dynamics for Enhanced Energy Storage Performance and Unprecedented Thermal Stability in Niobate-Based Glass Ceramics

Chen,

Wang,

Zhang

et al. 2024

ACS Appl. Mater. Interfaces

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The advancement of lead-free glass ceramics (GCs) possessing appropriate energy storage characteristics is crucial for the renewable energy and electronics industry. In this study, we synthesized lead-free GCs predominantly composed of the tungsten bronze phase, Ba 3.3 Nb 10 O 28.3 . Ab initio molecular dynamics initially reveal nonuniform distribution within the Ba/Nb−O regions in niobite glassy melts, offering valuable insights for the subsequent crystallization process. The proposal of a B-site engineering strategy is suggested, which entails the concurrent reduction of grain size and augmentation of the band gap in tungsten bronze GCs doped with Ta. This approach results in a substantial enhancement of the dielectric breakdown strength (BDS). Phase-field simulations have indicated that the refinement of grain sizes plays a pivotal role in augmenting the local electric field distribution and breakdown path, thereby contributing to the enhancement of BDS. As a consequence of these modifications, a notably high recoverable energy density (W rec ) of 5.23 J/cm 3 can be achieved, accompanied by an ultrahigh efficiency (η) of 94%, and superior thermal stability in energy storage. These outcomes are particularly evident in the case of 2 mol % Ta 2 O 5 -doped P 2 O 5 −K 2 O−BaO−Bi 2 O 3 −TeO 2 − Nb 2 O 5 (PKBBTN-T) GCs, where the W rec and η can be determined to be 2.87 ± 3% J/cm 3 and 95.46 ± 4%, respectively, over a temperature range spanning from 20 to 150 °C. Additionally, this specimen exhibits an exceptionally high discharge energy density (W dis ) of 4.01 J/cm 3 . This comprehensive investigation, comprising experimental and theoretical analyses, establishes an effective pathway and paradigm for the development of dielectric materials with ultrahigh energy storage properties.

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Section: Resultsmentioning

confidence: 99%

Engineering Phase Separation in Niobate Glass through Ab Initio Molecular Dynamics for Enhanced Energy Storage Performance and Unprecedented Thermal Stability in Niobate-Based Glass Ceramics

Chen,

Wang,

Zhang

et al. 2024

ACS Appl. Mater. Interfaces

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High‐Entropy Tungsten Bronze Ceramics for Large Capacitive Energy Storage with Near‐Zero Losses

Duan,

Wei,

et al. 2024

Adv Funct Materials

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In the field of dielectric energy storage, achieving the combination of high recoverable energy density (Wrec) and high storage efficiency (η) remains a major challenge. Here, a high‐entropy design in tungsten bronze ceramics is proposed with disordered polarization functional cells, which disrupts the long‐range ferroelectric order into diverse polar nanoregions (PNRs) characterized by composition fluctuation and cation displacement. These PNRs lower the domain‐switching barriers and weaken domain intercoupling, thereby playing a key role in delaying polarization saturation, reducing energy loss, and enhancing the breakdown electric field (Eb). Benefiting from the synergistic effects, at a large Eb of 760 kV cm−1, breakthrough energy storage performance is realized in tungsten bronze ceramics, including a record‐high Wrec of ≈10.6 J cm−3, an ultrahigh η of ≈96.2%, and a record‐high figure of merit of ≈279. These developments, along with superior mechanical properties, stability, and charge–discharge performance, fully demonstrate the feasibility of this strategy for realizing structural‐functional integration in tungsten bronze ceramics.

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Realizing high energy density and discharge energy density in high hardness Ba1.938Bi0.375Nb5O15-based glass ceramics

Cited by 2 publications

References 69 publications

Engineering Phase Separation in Niobate Glass through Ab Initio Molecular Dynamics for Enhanced Energy Storage Performance and Unprecedented Thermal Stability in Niobate-Based Glass Ceramics

Engineering Phase Separation in Niobate Glass through Ab Initio Molecular Dynamics for Enhanced Energy Storage Performance and Unprecedented Thermal Stability in Niobate-Based Glass Ceramics

High‐Entropy Tungsten Bronze Ceramics for Large Capacitive Energy Storage with Near‐Zero Losses

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