通过微观结构设计平衡极化和分解来实现高容量储能
Bingbing Yang1,2, Yiqian Liu2, Wei Li2
1Key Laboratory of Materials Physics Institute of Solid State Physics, HFIPS, Chinese Academy of Sciences, Hefei, 230031, China.
Advanced materials (Deerfield Beach, Fla.)
|May 28, 2024
概括
实现高能量储存需要平衡极化和分解强度. 具有小粒径和中等结晶度的最佳微结构增强介电性能,导致新膜的超高能量密度.
科学领域:
- 材料科学 材料科学 材料科学
- 凝聚物质物理学 凝聚物质物理学
- 介电材料 介电材料
背景情况:
- 介电材料的高能量储存性能需要在极化和分解强度之间做出妥协.
- 无形和晶体微结构对这些参数的影响不同:无形状态有利于分解强度,而晶体状态增强极化.
- 需要进行系统的定量研究,以平衡无形和晶体相,以获得最佳的能量储存.
研究的目的:
- 综合评估两极化和分解领域之间的权衡.
- 研究微观结构演变 (粒径,结晶性) 对储能性能的影响.
- 通过微观结构设计,为增强介电能存储提供指导.
主要方法:
- 用相场模拟来建模微观结构的演变及其对极化和分解场的影响.
- 模拟了颗粒大小和结晶度的系统变化.
- 使用具有微晶形态双相结构的Bi3NdTi4O12膜进行实验验证.
主要成果:
- 阶段场模拟显示,小颗粒大小 (10-35 nm) 与中等晶度 (60-80%) 结合,可以优化极化和分解场.
- 这种双相微观结构同时保持相对较高的极化和分解场.
- 在实验中,Bi3NdTi4O12薄膜达到131 J cm-3的超高能量密度,效率为81.6%.
结论:
- 无形和结晶相的平衡,特别是小粒度和中等结晶度,对于高介电能储存至关重要.
- 微结构设计提供了一个简单而有效的策略,可以显著提高介电能储能性能.
- 这些发现指导了用于储能应用的先进介电材料的开发.
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