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通过工作函数调整中间层,在粒度边界上统一电子分布,以防止固体电解质内形成丝

Jeewon Lee¹, Heebae Kim¹, Young Pyo Jeon²

¹Department of Chemical and Biological Engineering, and Institute of Chemical Processes, College of Engineering, Seoul National University, Gwanak-ro 1, Gwanak-gu, Seoul, 08826, Republic of Korea.

Small (Weinheim an der Bergstrasse, Germany)

|March 10, 2025

概括

防止在全固态金属电池中形成丝对于安全至关重要. 使用LiF介层在微结构接口上统一工作功能,可显著抑制光纤生长并增强电池稳定性.

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:

全固态金属电池 (ASSLMB) 需要安全运行,而丝形成是一个主要的安全问题.
了解无机固体电解质 (ISE) 的电子特性对于减轻丝形成至关重要.
在ISE中,在谷物边界的离子局部电流减少是光纤生长的主要驱动因素.

研究的目的:

阐明ISE中丝形成的机制.
为了研究在线丝核化中的微结构接口上的工作功能差异的作用.
制定一种策略,以抑制丝的形成,并提高ASSLMB的安全性.

主要方法:

在ISEs中,研究了谷物内部 (LLZO) 和谷物边界 (Li_xAlO_y) 之间的工作功能差异.
引入了一层薄的化 (LiF) 介层,以在微观结构中统一工作功能.
利用激光诱导分解光谱 (LIBS) 进行表面和横截面成像,以识别导线形成.

主要成果:

已确认的工作功能的差异 (≈4.2 eV与≈4.32 eV) 驱动了在谷物边界的局部离子减少.
证明LiF中间层 (≈4.08 eV) 能够有效地统一工作功能,抑制局部电流和Li-线程形成.
观察到Li-对称细胞与LiF中间层的临界电流密度增加了五倍,这表明电化学稳定性得到了增强.

结论:

这项研究揭示了ISE微结构接口中的工作功能异质性是丝形成的根本原因.
通过统一电子属性的微结构接口工程对于安全和稳定的ASSLMB至关重要.
LiF中间层为增强下一代固态电池的安全性和性能提供了一个可行的策略.

关键词:

防止Li-filament的使用所有固态电池都是固态电池.谷物界限谷物界限谷物界限二级阶段的第二阶段.工作功能调整工作功能调整

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