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一个Thiol分支的3D网络准固态聚合物电解质,增强了金属电池的共价有机框架

Kehan Tang¹, Qiaoshuang Bai¹, Peiwen Xu¹

¹Key Laboratory for Polymeric Composite & Functional Materials of Ministry of Education, IGCME, School of Chemistry, Sun Yat-sen University, Guangzhou, 510006, China.

|March 26, 2024

概括

这项研究引入了一种新型的准固态聚合物电解质 (QSPE),用共价有机框架 (COF) 增强. 这种新材料提高了机械强度和电化学性能,使金属电池更安全,性能更高.

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
聚合物科学聚合物科学

背景情况:

准固态聚合物电解质 (QSPEs) 为金属电池 (LMB) 提供高离子导电性和安全性.
在QSPEs中实现机械强度和高电化学性能仍然是一个重大挑战.
联有机框架 (COF) 由于其多孔结构和功能组,具有作为强化剂的潜力.

研究的目的:

通过将COF作为增强填充物和交叉连接器来开发高性能QSPE.
提高QSPEs的机械性能和电化学稳定性,用于先进的电池应用.
探索COF在设计下一代储能材料中的实用性.

主要方法:

合成了一种QSPE (SCOF-PEP-PEA),使用COF与基作为刚性多孔填充剂和交叉链接剂.
描述了QSPE的离子导电性,离子转移数和机械强度 (AFM Young的模量).
使用开发的QSPE制造和测试Li/LFP全电池,以评估速度性能和循环稳定性.

主要成果:

在室温下,SCOF-PEP-PEA QSPE显示出高离子导电性 (4.0 × 10−4 S cm−1) 和高离子转移数 (0.82).
与对照QSPE (36 MPa) 相比,观察到显著改善的机械强度 (AFM Young的模量:453 MPa).
/LFP全电池表现出极好的速率性能 (141mAhg-1在1C) 和高容量保留 (在0.5C,60°C的220个循环后92%).

结论:

将COF纳入QSPEs是一个有效的策略,可以同时提高机械强度和电化学性能.
开发的SCOF-PEP-PEA QSPE显示出对高性能和安全的金属电池的巨大承诺.
这项工作扩大了COF在储能领域的应用范围.

关键词:

共价有机框架是共价有机框架.高离子转移数的高离子转移数.金属电池是金属电池的一种.准固态聚合物电解质电解质.业绩表现率是指业绩的表现率.

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