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超稳固硫电池的Cu-Facet选择性硫化学

Xin Xu¹, Shiying Ren¹, Huan Li¹

¹School of Chemical Engineering, The University of Adelaide, Adelaide, South Australia 5005, Australia.

Journal of the American Chemical Society

|April 20, 2025

概括

研究人员利用铜面工程稳定硫电池. 这种方法抑制了聚硫化物穿,提高了先进的储能应用的循环稳定性和效率.

科学领域:

材料科学
电化学
能量储存

背景情况:

硫电池对储能具有前景,但由于聚硫化物穿效应,其循环稳定性和效率较低.
聚硫化在电解质中的高可溶性导致活性物质的不可逆转损失和容量降解.

研究的目的:

研究铜在硫电池中对硫氧化还原过程的面选择性反应.
开发一个稳定的中间阶段,减轻穿效应并提高电化学性能.

主要方法:

在选择性硫氧化还原反应中使用Cu(111) 面.
合成和表征稳定的NaCu5S3中间体.
进行电化学性能测试,包括循环稳定性和速率能力测量.
使用不同铜面 (Cu(100),Cu(110)) 和基板进行比较研究.
使用密度函数理论 (DFT) 计算来阐明反应机制.

主要成果:

111) 面促进了稳定的NaCu5S3中间体的形成,使固体-固体反应途径成为可能.
该工程系统表现出卓越的循环稳定性,在0.5 A g-1的800个循环中保持602 mAh g-1.
实现了高速率的能力,在5Ag-1时达到463mAhg-1,代表了具有≥60%硫的正极性能.
DFT的计算证实了面体依赖机制和电子相互作用.

结论:

铜的面积工程是一种可行的策略,用于控制-硫电池中的氧化还原通路.
面体诱导的中间体稳定性显著提高了循环稳定性和速率能力.
这种方法为开发高性能和耐用的金属硫电池提供了有前途的途径.

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