Greatly enhanced energy storage density of alkali-free glass-ceramics after dual optimizations by thickness and crystallization temperature

Fu, Tongtong; Qian, Jin; Xie, Shengshi; Liu, Changshuai; Shen, Bo; Zhai, Jiwei

doi:10.1016/j.ceramint.2023.03.273

Cited by 7 publications

(1 citation statement)

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“…They highlight findings from several studies, showing how the addition of certain elements can enhance properties like energy storage density and BDS. The influence of factors such as crystallization temperature and composition ratios on phase evolution and performance metrics like discharge energy density ( W dis < 2 J/cm 3 ) is also noted. − Although these GCs possess an ultrafast discharge time ( t 0.9 < 16 ns), their W dis and W rec are low, restricting the further improvement of energy density. Therefore, the promotion of BDS stands as a critical imperative for GCs in realizing an ultrahigh energy storage density.…”

Section: Introductionmentioning

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: Introductionmentioning

confidence: 99%