用于聚合物电解质的 g-C3N4@COF 异质结填料可实现快速锂+传输和高机械强度

IF 2.4 4区 化学 Q3 CHEMISTRY, PHYSICAL
Ionics Pub Date : 2024-09-06 DOI:10.1007/s11581-024-05796-8
Yongbiao Liu, Yang Song, Yongshang Zhang, Jiande Liu, Lin Li, Linsen Zhang, Lulu Du
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引用次数: 0

摘要

固体聚合物电解质(SPE)为高能量、高安全性锂金属电池带来了巨大的发展前景。然而,目前的固态聚合物电解质存在离子导电率低和机械强度差的问题。在此,我们为 SPEs 构建了 g-C3N4@COF 异质结填料,以实现快速的 Li+ 传输和高 Li+ 传递数。此外,还利用 g-C3N4@COF 异质结填料构建了坚固的三维网络,以进一步提高机械坚固性和电化学稳定性。因此,g-C3N4@COF-3D 网络/聚合物电解质在 30 ℃ 时的离子电导率为 1.25×10-4 S cm-1,电化学窗口为 5.0 V,拉伸强度为 8.613 MPa。此外,使用 g-C3N4@COF-3D 网络/聚合物电解质组装的 LiFePO4/Li 电池具有显著的循环稳定性,600 次循环后容量保持率为 99.71%。上述结果表明,g-C3N4@COF-3D 网络/聚合物电解质在先进储能设备中具有巨大潜力。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

g-C3N4@COF heterojunction filler for polymer electrolytes enables fast Li+ transport and high mechanical strength

g-C3N4@COF heterojunction filler for polymer electrolytes enables fast Li+ transport and high mechanical strength

Solid polymer electrolytes (SPEs) show great promise for high-energy and high-safety lithium metal batteries. However, current SPEs suffer from low ionic conductivity and poor mechanical strength. Herein, the g-C3N4@COF heterojunction filler is constructed for SPEs for fast Li+ transport and high Li+ transference number. In addition, a robust 3D network is fabricated by using g-C3N4@COF heterojunction filler in order to further improve the mechanical robustness and electrochemical stability. As a consequence, the g-C3N4@COF-3D network/polymer electrolyte displays an ionic conductivity of 1.25×10−4 S cm−1 at 30 ℃, an electrochemical window of 5.0 V and the tensile strength of 8.613 MPa. Furthermore, the assembled LiFePO4//Li battery with the g-C3N4@COF-3D network/polymer electrolyte presents remarkable cycling stability with a capacity retention of 99.71% after 600 cycles. The above results indicate the great potential of the g-C3N4@COF-3D network/polymer electrolyte for advanced energy storage devices.

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来源期刊
Ionics
Ionics 化学-电化学
CiteScore
5.30
自引率
7.10%
发文量
427
审稿时长
2.2 months
期刊介绍: Ionics is publishing original results in the fields of science and technology of ionic motion. This includes theoretical, experimental and practical work on electrolytes, electrode, ionic/electronic interfaces, ionic transport aspects of corrosion, galvanic cells, e.g. for thermodynamic and kinetic studies, batteries, fuel cells, sensors and electrochromics. Fast solid ionic conductors are presently providing new opportunities in view of several advantages, in addition to conventional liquid electrolytes.
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