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环氧乙网络结合剂可实现实用的电池中的超高硫负载

Jin Zhang¹, Dong Liang², Guang Huang³

¹Key Lab for Special Functional Materials of Ministry of Education, National; Local Joint Engineering Research Center for High-efficiency Display and Lighting Technology, School of Materials Science and Engineering, Collaborative Innovation Center of Nano Functional Materials and Applications, Henan University, Kaifeng, 475004, P. R. China.

Small (Weinheim an der Bergstrasse, Germany)

|August 29, 2025

概括

一种新的3D交联聚粘合剂 (PTPO) 提高了硫 (Li-S) 电池的性能. 这种粘合剂在实际条件下提高了循环稳定性和能量密度,解决了Li-S电池开发的关键挑战.

科学领域:

材料科学
电化学
聚合物化学

背景情况:

-硫 (Li-S) 电池在高硫负载和稀缺电解质等实际条件下实现高能量密度和长期稳定性方面面临挑战.
关键问题包括严重的体积膨胀,界面不稳定性和聚硫化物穿效应,阻碍实际应用.

研究的目的:

开发一种解决当前Li-S电池技术局限性的新型粘合剂.
增强机械灵活性,接口粘附性和对多硫化物的化学亲和力.
在苛刻的条件下提高电化学稳定性和总体电池性能.

主要方法:

通过糖醇三乙烯 (TEP) 和1,3-二醇 (DOL) 的离子共聚化合成了3D交联聚乙烯结合剂 (PTPO).
研究了粘合剂的特性,包括机械灵活性,接口粘合力和对多硫化物的亲和力.
在高硫负荷和稀缺电解质条件下评估了包含PTPO结合剂的Li-S电池的电化学性能.

主要成果:

PTPO粘合剂表现出高度的机械灵活性和强大的接口粘合力.
使用 PTPO 的 Li-S 电池在超高硫载荷 (11 mg cm−2) 和稀薄电解质 (E/S 比率为 6.4 μL mg−1) 的情况下,实现了 7.62 mAh cm−2 的高面积容量和 301 Wh kg−1 的能量密度.
一个概念验证袋电池的初始容量为2.25Ah,证明了其实际可行性.

结论:

合理设计的3D PTPO粘合剂有效地适应体积应力,并抑制Li-S电池中的穿效应.
PTPO提供了用于下一代Li-S电池的接口稳定和性能增强的综合解决方案.
这项工作为高能量密度电池应用中的功能聚合物结合剂提供了一个新的设计范式.

关键词:

三维聚合物粘合剂高硫含量硫电池分子设计穿效应

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