在Mo2C/MoC异构结构中的界面协同作用促进了高性能硫电池中的序列聚硫化物转化
Ximeng Liu1, Junhui Wang1, Wanwan Wang2
1Department of Materials Science and Engineering, National University of Singapore, Singapore, 117574, Singapore.
Small (Weinheim an der Bergstrasse, Germany)
|November 11, 2023
概括
一种新的Mo2C/MoC催化剂有效地抑制了硫电池中的多硫化物穿效应,通过利用不同的活性区域进行多硫化物转化. 这种设计显著提高了电池性能和循环寿命.
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
- 催化剂是一种催化剂.
背景情况:
- 聚硫化物穿效应阻碍硫 (Li-S) 电池的性能.
- 异构催化剂通过提供多个活性位点提供了潜在的解决方案.
- 了解异构结构中的表面和接口功能至关重要.
研究的目的:
- 设计和研究Mo2C/MoC异构催化剂,以提高Li-S电池的性能.
- 阐明材料表面和接口在聚硫化物转换中的作用.
- 为了证明不同活跃区域在异构结构中的协同效应.
主要方法:
- 在现场转换MoZn金属有机框架以创建Mo2C/MoC催化剂.
- 实验性表征和计算模拟以研究催化剂特性.
- 使用开发的Mo2C/MoC-硫阴极组装和测试Li-S电池.
主要成果:
- 这种Mo2C/MoC催化剂具有三活性区域结构 (Mo2C表面-接口-MoC表面).
- 接口有效地捕获和转化长链聚硫化物.
- Mo2C和MoC表面加速短链聚硫化物转化和Li2S解离.
- 带有Mo2C/MoC-S阴极的Li-S电池具有很高的初始容量 (1603.6 mAh g-1在1°C) 和出色的循环稳定性 (80.4%的容量保留在3°C的1000个循环后).
结论:
- 开发的Mo2C/MoC异构催化剂显著减轻了聚硫化物穿效应.
- 材料表面和接口之间的新协同作用增强了催化活性.
- 这项工作通过合理的异构结构设计为设计高性能Li-S电池提供了一条途径.
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