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聚硫化物对FeNi₃的温和吸附有利于金属间化合物加速转化动力学,用于高级硫电池

Shujun Liu¹, Tong Guo¹, Jun Jiang¹

¹Key Laboratory for Soft Chemistry and Functional Materials of Ministry of Education, Nanjing University of Science and Technology, Nanjing, 210094, P. R. China.

Small (Weinheim an der Bergstrasse, Germany)

|November 26, 2024

概括

这项研究通过使用FeNi_2.25@OC来优化聚硫化物转换来提高硫 (Li-S) 电池的性能. 这种方法显著提高了放电能力和循环稳定性,克服了Li-S电池技术的关键局限性.

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,但由于多硫化物转换动力学缓慢和穿效应而受到影响.
这些问题阻碍了Li-S电池的实际应用和长期稳定性.

研究的目的:

通过开发一种用于增强聚硫化物管理的新材料来解决Li-S电池的局限性.
通过格子工程来改善聚硫化物的催化转化和减轻穿效应.

主要方法:

通过Fe混合化在FeNi₃金属间化合物中使用格子工程来创建FeNi_2.25@OC.
研究了FeNi_2.25@OC的电子结构和吸附特性,用于聚硫化物.
进行了取决于温度的实验,以确定聚硫化物转换的激活能量.
组装并测试了使用FeNi_2.25@OC修饰分离器的Li-S电池.

主要成果:

FeNi_2.25@OC显示了多硫化物的中度和有利的吸附,削弱了S-S键.
该材料表现出最低的激活能量,加速了多硫化物催化转化.
-S电池在0.2°C时实现了1219.5mAhg-1的高初始放电特定容量.
在高硫负载 (6.06毫克/厘米-2) 和稀疏电解质条件下 (6毫升/毫克-1) 观察到60个周期的稳定循环.

结论:

在FeNi₃金属间化合物的晶格工程提供了一个有效的策略,以优化聚硫化吸附和转化在Li-S电池.
FeNi_2.25@OC修饰分离器显著提高了Li-S细胞的电化学性能和稳定性.
这种方法为克服实际Li-S电池应用中的关键挑战提供了有希望的解决方案.

关键词:

在FeNi3的基础上.格子工程格子工程硫电池是硫电池的一种.中度的吸附吸附.聚硫化物转换动力学

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