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揭示了锡的局部原子配置在碳阳极材料的增强NA存储上的作用

Chong Wang¹, Gaoxu Han¹, Zhouyang Qin¹

¹State Key Laboratory of New Ceramic Materials, School of Materials Science and Engineering, Tsinghua University, Beijing, 100084, China.

Small (Weinheim an der Bergstrasse, Germany)

|October 22, 2025

概括

工程-联合化碳矩阵与锡单个原子和集群增强离子电池阳极. 这种设计优化了储存,提高了性能和容量保留,用于先进的电池技术.

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:

推进离子电池技术需要了解碳阳极中亚纳米金属物种的Na+行为.
-联合化碳矩阵 (NFC) 为嵌入金属物种提供了一个有前途的平台.
控制嵌入金属的原子配置是优化电化学性能的关键.

研究的目的:

设计-联合化碳矩阵 (NFC),嵌入单个锡原子 (SnSAs) 和集群 (Sn─Clu).
为了研究Sn原子配置和Na+电化学行为之间的相互作用.
为高功率离子电池阳极建立一个多尺度的设计框架.

主要方法:

控制SnCl2前体含量的Sn─NFC架构的一合成.
使用同步子光谱法进行表征,以分析原子结构和结合.
密度函数理论 (DFT) 计算以建模Na+吸附和电子导电性.
电化学测试,以评估储存性能和循环稳定性.

主要成果:

优化的Sn-NFC架构表现出高特异面积 (208.1 m2 g-1为17%的Sn-NFC) 和可调节的Sn-Clu尺寸.
同时存在的SnSAs和Sn─Clu协同增强了Na+吸附 (ΔE = -2.56至 -2.64 eV) 和电子导电性.
17%的Sn─NFC阳极提供了高特异性容量 (362.2 mAh g−1在0.05 A g−1) 和出色的速率能力 (140.1 mAh g−1在20 A g−1).
在电解质中实现了异常容量保留 (87.4%超过500个周期),通过电解质优化进一步改进.

结论:

在NFC矩阵中Sn单个原子和集群的协同效应显著提高了储存性能.
精确控制嵌入金属的原子配置对于优化阳极材料至关重要.
这种多尺度的设计方法,将原子结构与宏观性能联系起来,推动了高功率离子电池的开发.

关键词:

纳米的储存机制.这里是Sn集群.Sn 是单个原子.碳材料是碳的材料.界面优化界面优化界面优化

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