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从阴极和分离器的角度加速聚硫化物在硫电池中的催化转化

Xiangyu Ding¹, Chang Sun¹, Qingbo Zhou¹

¹School of Materials Science and Engineering, Beijing Institute of Technology, Beijing 100081, China.

ACS applied materials & interfaces

|April 28, 2025

概括

研究人员开发了一种用于硫 (Li-S) 电池的新型双金属化催化剂. 这种催化剂提高了导电性和聚硫化物捕获,显著提高了电池的寿命和性能.

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) 电池具有高的理论能量密度,但面临着导电性差,多硫化物穿和慢动力学等挑战.
现有的Li-S电池技术受到硫及其排放产品的绝缘性阻碍,限制了实际应用.

研究的目的:

开发一种高效的双金属化电催化剂,以克服Li-S电池的局限性.
为了增强阴极导电性,离子运输和聚硫化物限制,使用一种新的空洞多孔核心外球形结构.

主要方法:

一种双金属化电催化剂的制造,具有空洞多孔的核心外球形结构.
在Li-S电池电池中将催化剂作为阴极宿主和修改分离器的整合.
利用密度函数理论 (DFT) 计算来研究双金属化物和多硫化物之间的相互作用.

主要成果:

双金属化催化剂显示出增强的阴极导电性,并提供了快速的离子运输通道.
独特的结构有效地限制了多硫化物,减轻了穿效应.
与硫化物相比,DFT的计算证实了双金属化物的多硫化物相互作用更强,反应障碍更低.

结论:

开发的双金属化电催化剂显著提高了Li-S电池的速率性能和循环稳定性.
实现了令人印象深刻的1400个周期的寿命,每周期的最小衰变率为0.030%,温度为1.0°C,展示了其下一代储能潜力.
这项研究为利用过渡金属化合物用于先进的Li-S电池应用提供了宝贵的见解.

关键词:

双金属化物双金属化物电催化剂是一种电催化剂.- 硫电池的使用情况.经过修改的分离器硫作为宿主存在.

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