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高速SiO离子电池阳极通过合理接口混合封装工程实现

Guanjia Zhu¹, Xiao Fang², Xiuyan Liu¹

¹Institute of Nanochemistry and Nanobiology, Shanghai University, Shanghai 200444, P. R. China.

ACS applied materials & interfaces

|January 26, 2024

概括

这项研究开发了一种混合MXene-graphene氧化物涂层用于 (Si) 阳极的离子电池. 这种涂层提高了导电性和稳定性,为快速充电应用提供了高速率性能.

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
储能储能储能储能储能储能

背景情况:

(Si) 阳极为离子电池提供了高的理论容量,但受到低导电性,缓慢的接口电荷传输 (ICT) 和不稳定的接口的影响.
界面工程,特别是混合涂层,对于调节界面反应和形成稳定的固体电解质界面 (SEI) 来克服Si阳极限制至关重要.

研究的目的:

开发用于Si微粒的混合MXene-graphene氧化物 (GO) 涂层,以提高离子电池阳极性能.
为了提高高速率和长周期寿命应用的合电子/离子传输和接口稳定性.

主要方法:

在Si微粒上构建了Ti3C2Tx MXene和石墨烯氧化物 (GO) 的混合涂层.
在Si,MXene和GO之间利用共价键 (Ti-O-Si,Ti-O-C) 来降低ICT电阻.
研究了MXene和GO对伪容量主导的储存的协同效应,并分析了界面化学.

主要成果:

Si@MXene@GO阳极表现出优越的速率能力 (1175.9 mAh g-1 在5 A g-1) 和长周期稳定性 (1087.6 mAh g-1 在1000个周期后在2.0 A g-1).
混合涂层促进了增强的电子和离子运输,从而导致伪电容主导的电荷存储.
具有梯度LiF和Li2O分布的有机丰富的SEI层确保了循环过程中的机械稳定性.

结论:

混合MXene-GO涂层有效地解决了Si阳极的局限性,显著提高了离子存储性能.
这种接口封装策略为开发用于快充离子电池的先进Si阳极提供了可行的途径.

关键词:

这就是MXene MXene.这是一个SiO阳极.快充的离子电池是快充的离子电池石墨烯氧化物石墨烯氧化物混合封装的混合封装.

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