通过局部结构设计实现了优异的储能密度和90%以上的效率
Huajie Luo1, Zheng Sun1, Ji Zhang2
1Department of Physical Chemistry, Beijing Advanced Innovation Center for Materials Genome Engineering, University of Science and Technology Beijing, Beijing 100083, China.
Journal of the American Chemical Society
|December 18, 2023
概括
研究人员开发了先进的介电陶电容, 这一突破为下一代电子设备提供了可回收的高能量密度和效率.
科学领域:
- 材料科学
- 固态物理
- 纳米技术
背景情况:
- 介电陶电容对于电子设备至关重要,但同时实现高可回收能密度 (Wrec) 和效率 (η) 仍然具有挑战性.
- Bi0.25Na0.25Ba0.5TiO3 (BNT-50BT) 具有很大的局部极化和结构扭曲,使其成为一个有前途的矩阵材料.
研究的目的:
- 证明开发具有高Wrec和η的介电陶电容的可行性.
- 研究当地的结构与储能性能之间的关系.
主要方法:
- 密度函数理论 (DFT) 的计算.
- 在格子和原子尺度上进行局部结构分析.
- BNT-50BT矩阵的化学修饰.
主要成果:
- 在Bi0.25Na0.25Ba0.5Ti0.92Hf0.08O3中达到16.21J/cm3的Wrec.
- 这代表了散装陶的最高Wrec, η > 90%.
- 无序的极化和小的纳米区域 (∼3 nm) 导致低歇斯底里和高效率.
结论:
- 基于理解局部结构的化学设计可以针对高性能储能系统进行有针对性的调节.
- 在超高电场下的局部极化激增会激活更高的能量储存密度.
- 这项研究突出了开发先进介电陶电容的途径.
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