揭示微观结构对二维半孔碳阳极储行为的影响
Xinli Huang1, Jing Gao1, Yuying Qin1
1Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials, Ministry of Education, School of Materials Science and Engineering, Shandong University, Ji'nan 250061, China.
ACS nano
|August 1, 2024
概括
研究人员开发了可调节的二维半孔碳微币 (2D-MCM) 用于离子电容器. 优化微观结构可以增强电荷存储,从而实现高能量和功率密度的先进能量存储.
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:
- 硬碳是离子储能装置的关键阳极材料.
- 挑战包括缓慢的动力学和体积变化,这是由于大K+离子半径造成的.
- 硬碳微结构与K+电荷储存之间的联系尚未完全理解.
研究的目的:
- 为了合成和研究具有可调微结构的二维半孔碳微币 (2D-MCMs).
- 探索异质原子含量,石墨化程度和离子储存行为之间的关系.
- 为高性能离子电容器优化2D-MCM.
主要方法:
- 简单的硬模板合成2D-MCMs.
- 温度可控制的回火工艺来调整微观结构.
- 使用三电极Swagelok细胞进行电化学表征.
主要成果:
- 高原子含量促进了表面驱动的K+储存,增加了高潜力区域的容量.
- 高度的石墨化程度有利于K+间隔,增加了潜在能力较低的地区的容量.
- 优化的2D-MCM阳极使电化学窗口更宽,电荷储存更高.
结论:
- 2D-MCM的微结构调整对于控制K+存储机制至关重要.
- 优化的2D-MCM阳极显著提高离子电容器的性能.
- 基于优化的2D-MCM的离子电容器实现了高能量 (113 Wh kg-1) 和功率 (51,000 W kg-1) 密度.
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