刚性-灵活的他-双化物框架使得快速的电子移位和低晶体阻碍的离子储存成为可能
Wenyan Du1, Yehui Zhang1, Hui Duan1
1Shanghai Key Lab of Chemical Assessment and Sustainability, School of Chemical Science and Engineering, Tongji University, 1239 Siping Rd., Shanghai 200092, P. R. China.
Science advances
|March 6, 2026
概括
研究人员为离子电池 (AIB) 开发了新的聚合物酸-双化框架 (HBF). 这些HBF提供高容量和速率能力,使先进的全聚合物AIB具有更高的能量密度和寿命.
科学领域:
- 材料科学 材料科学 材料科学
- 电化学 电化学 电化学
- 聚合物化学 聚合物化学
背景情况:
- 聚合物阳极在离子电池 (AIB) 中比小分子和无机材料具有优势.
- 现有的聚合物阳极要么是刚性的离子运输,要么是灵活的活跃现场利用,存在局限性.
- 需要聚合物设计,将刚性和灵活性的好处结合起来.
研究的目的:
- 为卓越的AIB性能设计和合成新型聚合物赫普他-双化物框架 (HBF).
- 为了研究HBFs增强电化学活性的结构-属性关系.
- 展示HBFs在最先进的全聚合物AIB中的潜力.
主要方法:
- 整合平面赫普他单元和柔性比古安化连接器,形成HBFs.
- 电化学表征以评估容量,速率能力和循环稳定性.
- 结构分析以了解离子协调和能量障碍.
主要成果:
- HBF 呈现出超高的 imine 位点利用率 (99.6%) 和超低的激活能量 (0.15 eV).
- 实现了314 mAh/g的记录容量和60 A/g的特殊速率能力.
- 开发了具有前所未有的能量密度 (100.6Wh/kg) 和长周期寿命 (120,000个周期) 的全聚合物AIB.
结论:
- HBFs的刚性-灵活设计有效地结合了AIB阳极所需的特性.
- HBFs代表了设计高性能能量存储的先进有机材料的新范式.
- 这项工作为下一代全聚合物离子电池铺平了道路.
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