协同利用空间封闭和双金属催化,以提高硫电池中的硫动力学
Xiaoyan Ren1, Qin Wang1,2, Yulai Pu1,2
1State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, Jilin, 130022, P. R. China.
Advanced materials (Deerfield Beach, Fla.)
|July 19, 2023
概括
这项研究引入了一种新的核心外金属有机框架 (MOF) 来稳定硫 (Li-S) 电池. MOF通过防止穿反应和改善动力学来提高容量保留和循环性.
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
- 纳米技术纳米技术
背景情况:
- 硫 (Li-S) 电池面临的挑战包括缓慢的动力学和寄生式穿反应,限制容量保留和循环.
- 需要有效的策略来克服这些局限性,以实现实际的Li-S电池应用.
研究的目的:
- 开发一个核心结构的Co/Ni双金属合金属有机框架 (MOF),用硫纳米颗粒封装.
- 通过增强的空间限制和催化活性来解决Li-S电池中的缓慢动力学和穿效应.
主要方法:
- 合成核心外结构的Co/Ni双金属合MOF/硫纳米颗粒.
- 使用物理化学和理论分析进行表征.
- 组装和测试Li-S电池. 电池的组装和测试.
主要成果:
- MOF外提供长期稳定性,离子选,高聚硫化吸附和催化转化.
- 由于MOF的移位电子,增强了电子和离子转移.
- 协同相互作用显著改善了界面电荷转移动力学,硫转化动力学和穿抑制.
- 组装的Li-S电池显示出稳定的容量,在0.2°C的400个循环中具有边际衰变 (每循环0.075%) 超过0.2°C.
- 在高硫负载下,袋式电池在200个周期内实现了3.8 mAh cm-2的面积容量.
结论:
- 开发的MOF策略通过减轻关键的操作问题,有效地提高了Li-S电池的性能.
- 核心外MOF结构为先进的储能解决方案提供了一个有前途的途径.
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