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解读纳米孔受限衍生硬碳阳极的闭孔形成和大小依赖的集群填充行为

Chuang Qiu¹, Yawen Wu¹, Xinzhuo Mai¹

¹State Key Laboratory of Chemical Resource Engineering, Beijing Key Laboratory of Electrochemical Process and Technology for Materials, Beijing University of Chemical Technology, Beijing, 100029, P. R. China.

|August 20, 2025

概括

用于离子电池的工程硬碳阳极通过精确控制闭孔形成,表现出增强的低压高原容量. 这项研究揭示了孔径大小如何影响集群填充,优化电池性能.

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:

硬碳 (HC) 阳极中的低压平原容量 (LVPC) 对离子电池 (SIB) 至关重要.
这种容量来自于阳极材料的闭孔内填充的集群.
优化HC阳极需要了解闭孔形成和集群相互作用.

研究的目的:

为了阐明活性炭 (AC) 热解过程中闭孔形成的机制.
为了研究这些关闭毛孔对集群填充行为的大小依赖的影响.
建立高性能HC阳极的电化学特征和孔状特征之间的预测关系.

主要方法:

活性炭 (AC) 的泥封闭式热解,以设计封闭的孔隙.
系统地改变位剂量以控制闭孔大小.
硬碳 (HC) 阳极的电化学表征.
密度函数理论 (DFT) 计算以建模集群填充.

主要成果:

在AC中,pitch-confined pyrolysis有效地将开放的毛孔转化为关闭的毛孔.
在电化学曲点和闭孔大小之间发现了直接的相关性.
集群由于更高的填充潜力而优先填充较小的闭孔,随后是较大的孔.
这项研究揭示了闭孔的形成和尺寸演变机制.

结论:

通过 Pitch-Confined Pyrolysis 封闭孔工程是高LVPC HC阳极的可行策略.
电化学曲点可以预测与储存相关的闭孔大小.
了解集群的大小依赖的填充顺序可以优化SIBs的阳极设计.

关键词:

闭孔尺寸闭孔尺寸闭孔尺寸闭孔形成机制的机制.硬碳阳极是一种硬碳阳极.集群填充行为在离子电池中使用.

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