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为高性能Li-S电池提供ZIF-67衍生灵活硫阴极,具有改进的还氧化动力学

Chen Cheng¹, Hanyan Wu¹, Xinyang Chen¹

¹Center for Lignocellulosic Chemistry and Biomaterials, College of Light Industry and Chemical Engineering, Dalian Polytechnic University, Dalian 116034, China.

Molecules (Basel, Switzerland)

|April 27, 2024

概括

本研究介绍ZIF-67@CL作为一种新型电催化剂,通过增强聚硫化物转化来加速硫电池性能. 催化剂显著提高了容量和周期寿命,解决了硫电池技术的关键局限性.

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
储能储能储能储能储能储能

背景情况:

-硫 (Li-S) 电池具有高能量密度,但由于多硫化物转换动力学缓慢而受到影响.
音量膨胀和穿效应是阻碍Li-S电池应用的关键挑战.

研究的目的:

在纤维素 (ZIF-67@CL) 上种植的ZIF-67作为Li-S电池的电催化剂的设计和评估.
提高多硫化物 (LiPSs) 到Li2S2/Li2S. 的转化动力学.

主要方法:

合成的 ZIF-67@CL 电催化剂.
通过UV-Vis光谱学进行LiPSs吸附实验.
通过静电和静电放电进行了Li2S核化试验.
制造并测试了带有S/ZIF-67@CL阴极的Li-S电池电池.

主要成果:

与裸体纤维素相比,ZIF-67@CL显示LiPS的吸附性更强.
2S核化试验证实了ZIF-67.7的催化作用.
该S/ZIF-67@CL阴极在0.2°C时实现了1346mAhg-1的初始容量.
观察到高容量保留 (462mAhg-1在2°C的150个循环后) 和>99.82%的库伦比效率.

结论:

ZIF-67@CL有效催化了LiPS的转化,提高了Li-S电池的性能.
开发的电催化剂显著提高了容量和循环稳定性.
这项工作为推进Li-S电池技术提出了一个有前途的战略.

关键词:

在 ZIF-67@CL 阴极上催化了多硫化物的转化.电化学运动学电化学运动学穿效应的穿效应

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