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双组件中间层使固态电池能够进行统一的沉积和树抑制

Xiang You¹, Ning Chen², Geng Xie¹

¹Department of Chemistry, University of Alberta, Edmonton T6G 2N4, Canada.

ACS applied materials & interfaces

|June 21, 2024

概括

研究人员开发了一种用于固态电池的双组件保护层LiSn-LiN. 这一层抑制了树状石的形成,使得临界电流密度翻倍,以实现更安全,更高能量密度的应用.

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
电池技术电池技术

背景情况:

乙硫酸 (LPS) 是一个有前途的陶电解质,用于高能量密度全固态电池,由于其高Li+导电性.
将LPS与金属阳极集成提供了最高的理论容量,但由于实际电流密度的树突形成,由于短路而受到限制.

研究的目的:

设计和实施在现场形成的接口保护层,以抑制基于LPS的固态电池中的树石生长.
为了提高固态电池的关键电流密度和整体性能.

主要方法:

在电极和LPS电解液之间制造双组件LiSn-LiN保护层.
使用X射线光电子光谱 (XPS) 和X射线吸收细结构 (XAFS) 分析来研究中间层的结构和形成.
电化学测试以评估临界电流密度和树抑制.

主要成果:

该LiSn-LiN中间层通过促进均沉积 (Li22Sn5) 和防止透 (Li3N),有效地抑制了 dendrite 的形成.
与未受保护的系统相比,保护层将可交付的临界电流密度增加了一倍以上.
阐明了Li22Sn5相的形成动力学和局部结构.

结论:

可以有效地在现场设计和形成双组件接口层 (LiSn-LiN),以减轻基于LPS的固态电池中的状物问题.
根据特定的电池配置和接口化学结构量身定制保护层结构对于优化性能至关重要.
这种方法为开发更安全,更实用的高能量密度全固态电池提供了可行的策略.

关键词:

富含的中间层是富含的所有固态电池都是固态电池.电极/电解质接口接口李安德表示它可以抑制状的抑制.均的液体沉积方式

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