带有铁电类晶体的线性介电聚合物用于高温电容储能
Jie Chen1, Chao Wu2, Jingyu Deng2
1Shanghai Key Laboratory of Electrical Insulation and Thermal Ageing, School of Chemistry and Chemical Engineering, Shanghai Jiao Tong University, Shanghai, 200240, China.
Advanced materials (Deerfield Beach, Fla.)
|January 22, 2025
概括
研究人员开发了一种新型聚合物介电器,使用类似铁电的晶体,实现高级电容器的高能量存储和低损耗. 这种材料提供了卓越的高温性能,对于储能应用至关重要.
科学领域:
- 材料科学 材料科学 材料科学
- 聚合物科学 聚合物科学
- 介电材料 介电材料
背景情况:
- 最佳的电容储能需要将高能量密度 (铁电介电材料) 与低极化损失 (线性介电材料) 结合起来.
- 整合这些属性是具有挑战性的,因为铁电和线性介电材料的相冲突的特性.
- 现有的材料往往会在高温下损害性能.
研究的目的:
- 开发一种新型介电材料,它结合了高能量储存密度和低极化损失.
- 为了创建一个聚合物介电,能够高温电容储能.
- 探索聚合物结晶性用于增强介电性质的使用.
主要方法:
- 合成一个线性同性硫化聚甲介电体.
- 介电性质的表征,包括介电常数和散射因子,在一系列温度范围内.
- 在高温下评估储能性能,特别是放电能量密度和效率.
主要成果:
- 开发的聚合物表现出具有对齐的硫二极体的铁电状晶体.
- 在室温下7.5的介电常数在玻璃过渡温度 (≈140°C) 上升到12度,损耗最小.
- 在150°C和320 MV m-1下达到6.76 J cm-1的放电能量密度,显著超过了最先进的材料.
结论:
- 新型聚合物介电器成功地结合了铁电和线性介电物的可取性质.
- 利用聚合物结晶性形成极性结构为高温介电材料提供了一种新的策略.
- 这一进步为设计下一代高温储能器件提供了一个有前途的途径.
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