通过形成 Li-Zipped MXenes 和一个富含 Li 化物的固体电解质间相,使 2D 层过渡金属碳化物具有稳定和低应变的涂/剥离
Liang Ma1,2, Yong-Kang Jiang1,2, Dong-Rui Xu1,2
1School of Materials Science and Engineering, Beijing Institute of Technology, Beijing, 100081, P. R. China.
Angewandte Chemie (International ed. in English)
|January 31, 2024
概括
这项研究引入了一种用于2D分层材料中控制涂层的新方法,提高了电池的稳定性和性能. 该技术使用电化学剪刀和拉链机制,以稳定沉积和提高循环效率.
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:
- 二维 (2D) 层级材料提供了通过将限制在它们的中间层中来调节涂/剥离的潜力.
- 挑战包括在这个过程中保持结构稳定性和固体电解质间相 (SEI) 完整性.
研究的目的:
- 开发一种协议,以最小的应变和体积变化进行间层限制的涂层.
- 在沉积和剥离过程中增强二维材料和SEI层的结构稳定性.
主要方法:
- 使用了电化学剪刀和拉链驱动的协议.
- 作为"拉链",将MXene重塑成一个更稳定的MAX类相.
- 富含化的SEI是通过电化学去除MXenes的素终端而形成的.
主要成果:
- Ti3C2I2宿主在320次涂/剥离循环后,显示了超过97.0%的平均Coulombic效率.
- 一个使用Ti3C2I2@Li的全电池在苛刻的条件下 (高阴极负载,低N/P比率) 在200个循环后实现了73.4%的容量保留.
结论:
- 开发的协议有效地实现了间层限制的涂层,增强了结构稳定性和SEI性能.
- 这项工作为先进电池的2D分层材料中对和其他金属涂层/脱落的调节提供了新的见解.
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