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热电场增强硫进化动力学,用于高性能硫电池

Danqi He¹, Xiaopeng Zhang², Lishai Chen²

¹Hubei Key Laboratory of Theory and Application of Advanced Materials Mechanics, Wuhan University of Technology, Wuhan, Hubei, 430070, China.

Advanced materials (Deerfield Beach, Fla.)

|May 13, 2025

概括

一种新的Bi$_{0.5}$Sb$_{1.5}$Te$_{3}$/碳纳米管介层通过吸附聚硫化物和使用热电场来加速它们的转化,提高耐用性和容量,从而提高硫 (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) 电池具有高的理论能量密度,但由于穿效应和缓慢的多硫化物 (LiPSs) 转换而受到阻碍.
制定有效的策略来缓解这些问题对于实际部署Li-S电池至关重要.

研究的目的:

设计和研究一种用于Li-S电池的新型中间层,以提高耐用性和电化学性能.
探索吸附点和中间层产生的热电场对LiPSs转换动力学的联合影响.

主要方法:

一个Bi$_{0.5}$Sb$_{1.5}$Te$_{3}$/碳纳米管 (BST/CNT) 复合材料中间层的制造.
实验性表征包括电化学性能测试 (循环电压测量,长期循环).
密度函数理论 (DFT) 和吉布斯自由能量计算,以了解吸附和反应机制.

主要成果:

在BST/CNT间层中,LiPSs的吸附性比较强.
由BST产生的热电场显著加速了LiPSs的转换动力学.
20%的BST中间层的细胞在1°C的500个周期中表现出极好的稳定性 (每个周期的容量衰减为0.05%).
高放电容量 (594 mAh g$^{-1}$) 在10°C下保持,在苛刻的条件下 (高硫负载,低电解质比率) 达到5.9 mAh cm$^{-2}$的面积容量.

结论:

热电场是提高Li-S电池中的LiPS转换动力学的有效机制.
BST/CNT中间层显示出提高Li-S电池的性能和耐用性的巨大潜力.
这种方法为推进下一代储能技术提供了一个有希望的途径.

关键词:

LiPSs 的转换动力学这种电池是Li-S电池.穿效应的穿效应热电场是一种热电场.

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