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Updated: Mar 10, 2026

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通过双阴极介层工程提高Li-S电池的性能:空心TiO2硫与电MXene-TMO介层

Busra Cetiner¹, Shungui Deng², Cesare Roncaglia³

¹Faculty of Engineering and Natural Sciences, Department of Materials Science and Nanoengineering, Sabanci University, 34956 Istanbul, Turkey.

|March 9, 2026

概括

这项研究引入了一种双工程硫 (Li-S) 电池阴极,使用处理的二氧化 (H-TiO2) 和MXene-tin氧化物中间层. 这一策略通过抑制聚硫化物穿和改善动力学来显著提高Li-S电池的性能.

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) 电池面临的挑战包括由于聚硫化物 (LiPS) 穿,缓慢的氧化还原动力学和绝缘性放电产品而导致的容量衰减.
现有的策略往往难以同时解决LiPS穿,动力学和Li-S系统中的产品绝缘.

研究的目的:

为Li-S电池制定双重工程战略,以克服性能限制.
为了研究处理的空心TiO2 (H-TiO2) 硫宿主和PVDF/MXene-SnO2 (PV-MS) 间层的协同效应.
用实验和计算方法阐明增强性能的潜在机制.

主要方法:

制造一个由H-TiO2硫主体和PV-MS中间层组成的双工程阴极系统.
电化学表征包括循环测试,速率能力测试和电化学阻抗光谱 (EIS).
使用X射线光电子光谱 (XPS) 的表面分析和使用密度函数理论 (DFT) 的理论计算.

主要成果:

具有Ti3+和氧空缺的H-TiO2宿主增强了导电性,并为硫固定和催化提供了活性场所.
该PV-MS间层有效地吸附LiPS并加速转换动力学,降低了93%的电荷传输电阻.
协同效应导致循环稳定性显著改善 (81%的容量保留),Li + 扩散率翻倍,以及强大的速率能力.

结论:

双工程天极系统有效地抑制了聚硫化物穿,并增强了Li-S电池中的电化学动力学.
H-TiO2和PV-MS中间层表现出协同效应,导致优越的Li-S电池性能和寿命.
这项工作为开发高性能,寿命长的Li-S电池提供了强大的设计准则.

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