交联聚合物介电物的协同分子工程,用于高温电容储能
Yan He1,2, Quan Sun3, Rui Xue1,2
1Key Laboratory of Science and Technology on High-Tech Polymer Materials, Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100190, China.
Advanced materials (Deerfield Beach, Fla.)
|October 11, 2025
概括
新的环聚合物通过优化分子极性和交叉链接来克服高温储能中的权衡. 这些先进的聚合物介电材料在极端条件下提供卓越的热稳定性和能量密度.
科学领域:
- 材料科学 材料科学 材料科学
- 聚合物化学 聚合物化学
- 储能 储能 储能 储能 储能 储能
背景情况:
- 聚合物介电电容对于高温储能至关重要.
- 由于导电损失或极化不足,现有的材料在热稳定性和电容性能方面扎.
研究的目的:
- 设计和合成用于高温能量存储的新型环聚合物.
- 通过同时优化分子极性,拓交联和自由体积,克服当前材料的局限性.
主要方法:
- 基于norbornene的单体的模块化分子工程.
- 加入环丁 (BCB) 和硫甲基组.
- 环开放型元解聚合 (ROMP) 来创建交联网络.
- 分子动力学 (MD) 和密度函数理论 (DFT) 模拟.
主要成果:
- 实现了高的热稳定性 (玻璃过渡温度,Tg > 350°C) 和抑制的消散 (Df ≈ 0.0006).
- 优化聚合物 (P50-B250) 在150°C下提供8.00 J cm-3的放电能量密度,效率≥90%.
- 完全交联的聚合物 (P0-B300) 在更高的温度下保留了显著的能量密度 (在200°C时7.34 J cm−3,在250°C时4.65 J cm−3).
- 交叉连接增加了约40%的自由体积,抑制了电荷转移复合体 (CTC).
结论:
- 通过结构模块化和拓控制建立了设计聚合物介电物的一般框架.
- 在极端条件下展示了下一代储能应用的途径.
- 开发了超越传统材料的高性能聚合物介电材料.
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