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在超高容量的剥离/合周期中,金属微结构的时间演变

Arghya Dutta¹, Yoshimi Kubo¹

¹Center for Green Research on Energy and Environmental Materials, National Institute for Materials Science, 1-1 Namiki, Tsukuba, 305-0044, Japan.

Advanced science (Weinheim, Baden-Wurttemberg, Germany)

|June 10, 2025

概括

了解 (Li) 晶体生长是稳定的金属电池 (LMB) 的关键. 这项研究揭示了如何介相性质和沉积速度控制Li微结构,从而实现更好的电池设计.

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:

沉积 (Li) 的形态对于金属电池 (LMB) 的稳定性和可逆性至关重要.
晶体学特征影响沉积形态,但在不同的条件下晶体的方向和演变尚未完全理解.

研究的目的:

研究在超高容量和重复循环时的电沉积过程中的微观结构演变.
阐明LMBs中相间特性,沉积动力学和Li微结构之间的关系.

主要方法:

利用扫描电子显微镜 (SEM) 进行Li微结构的高分辨率成像.
采用电子反射散射衍射 (EBSD) 来分析晶体学方向和粒度结构.
研究了在容量高达12 mAh cm−2的电解和在延长循环过程中.

主要成果:

一层一层的表轴性Li增长与连贯的晶格方向发生在同质的介相和缓慢的动力学下.
在高容量或延长循环时,相间同质性的恶化会导致具有随机粒度方向的岛状沉积物.
不均的介相和更快的动力学促进了类似胡须的沉积物.

结论:

保持相间同质性和稳定性对于连贯的晶格匹配和层次的 Li 表轴增长至关重要.
凝聚性相互作用可以导致孤立的单晶粒,但相间控制是均沉积的关键.
获得的洞察力可以指导稳定接口的设计,并优化耐用,高容量的LMB的条件.

关键词:

立方体储存是一种Li储存方式.金属电池电池的使用情况微观结构分析的分析形态分析分析形态分析超高容量的电池超高容量的电池

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