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在硫电池中的高氧化物异构增强双向电催化

Siyu Ji¹, Yating Cui¹, Tongtong Lu¹

¹Institute of Materials Research, Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen 518055, China.

ACS applied materials & interfaces

|March 26, 2025

概括

一个新的高异连接介层 (HEO@CC) 通过增强聚硫化和氧化还原动力学来提高硫电池性能,显著改善容量保留和循环寿命.

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) 电池在理论上具有很高的容量,但其运动速度缓慢和多硫化物穿效应阻碍了商业化.
开发有效的介层对于缓解这些问题和提高Li-S电池性能至关重要.

研究的目的:

设计和合成一种新的高异连接介层 (HEO@CC),以应对Li-S电池的挑战.
调查HEO@CC中间层所提供的催化机制和性能增强.

主要方法:

通过在碳布上生长FeCoNiO-MnCrO (HEO) 颗粒来制造一个高异质连接中间层 (HEO@CC).
电化学表征包括速率能力测试和周期寿命分析.
微分辐射传输 (DRT) 技术用于分析聚硫化物定和转换动力学.

主要成果:

HEO@CC提供多金属活性位点,低内在电阻和增强的聚硫化物 anchoring.
观察到Li2S的加速氧化还原动力学和有效的物理阻断聚硫化物穿.
HEO@CC电池表现出良好的容量保留 (622.79 mA h g-1在500个循环后) 与低衰变率 (每周0.029%).

结论:

HEO@CC中间层显著改善了硫的利用,降低了阻抗,并增强了Li-S电池中的Li+扩散.
这项研究提出了一种新的方法,用于设计高异构的介层,用于先进的能量存储.
这些发现促进了高容量和稳定的Li-S电池技术的发展.

关键词:

这是一种双向催化剂.高异构的高异构结构多硫化的聚硫化物硫电池是硫电池的一种.硫氧化还原反应反应的硫.

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