通过增强表面度效应,在二离子电池的石墨阴极中进行 PF6-和Na+的协同干扰
Fan Li1, Yong-Feng Shen1, Bin He1
1Department State Key Laboratory of Fine Chemicals, School of Chemical Engineering, Dalian University of Technology, Dalian, 116024, P. R. China.
ChemSusChem
|February 4, 2025
概括
小石墨微晶增强双离子电池阴极,使离子和离子的协同插入. 这提高了性能,为先进的储能系统提供了一条新的道路.
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:
- 双离子电池利用离子和离子来储存能量,这给阴极性能带来了独特的挑战.
- 双离子系统中的阴极通常由于复杂的离子相互作用而表现出有限的速率能力.
研究的目的:
- 研究不同尺寸的石墨微晶在双离子电池中作为阴极的使用.
- 阐明这些系统中增强速率性能背后的机制.
主要方法:
- 使用不同微晶尺寸的石墨作为阴极材料.
- 使用高度的电解质.
- 在现场进行X射线衍射 (XRD) 和拉曼光谱.
- 进行喷射X射线光电子光谱 (XPS) 分析.
主要成果:
- 较小的石墨微晶增强了表面效应,为离子相互作用创造了更多的电活化区域.
- 喷射XPS证实了六酸离子 (PF6-) 与酸 (Na+) 在阴极中的共同插入.
- 这种协同插曲加速了电池内部的动态过程.
结论:
- PF6和Na+的协同插曲是由石墨阴极中的增强表面度效应驱动的.
- 这种机制带来了卓越的速率性能,在2°C时容量为103.6mAhg-1,在50°C时保持94.8%.
- 这些发现提供了对双离子电池中的离子干机制的见解,并指导设计高性能储能解决方案.
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