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三位一体设计的渐变人工间相使巨大的粒状矿可用于稳定的金属电池

Kun Wang¹, Xiangxiang Wang¹, Jianhong Gao¹

¹College of Chemical and Biological Engineering, Zhejiang University, Hangzhou, 310027, China.

Small (Weinheim an der Bergstrasse, Germany)

|June 14, 2024

概括

使用MgF2,CTAC和PVDF-HFP涂层的新型三位一体梯度间相稳定了金属阳极. 这种人工SEI可以防止树突的生长,增长电池的寿命,并使各种完整的细胞能够稳定循环.

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:

金属电池 (LMB) 由于不稳定的固体电解质介相 (SEI) 和树状岩石的形成,面临着有限的循环寿命.
开发人工SEI层对于克服这些挑战和实现实际LMB应用至关重要.

研究的目的:

为金属阳极 (LMAs) 设计和研究一种新的三位一体梯度间相.
通过抑制树突的生长和改善离子流量来增强LMB的稳定性和循环性能.

主要方法:

在LMA上制造由化 (MgF2),N-hexadecyltrimethylammonium化 (CTAC) 和聚乙烯化-化共聚合物 (PVDF-HFP) 组成的复合涂层.
描述SEI的组成,形态和电化学特性.
测试了改造的LMA在LFP,NCM811和全细胞中的性能.

主要成果:

MgF2/CTAC/PVDF-HFP涂层形成了一种富含LiF的SEI和一种性Li-Mg合金基板.
-Mg合金使电场分布均,并降低了内部电阻.
LiF/PVDF-HFP SEI提供了快速的离子导电和机械灵活性,而CTAC则通过静电屏蔽来缓解树突.
在各种全细胞配置中实现了具有稳定的循环性能的无树LMA.

结论:

三位一体梯度间相的协同效应有效地保护了LMA.
这种人工SEI设计促进了统一的沉积,并提高了电池的循环寿命.
该研究为金属电池中先进的人工SEI工程提供了一个有希望的策略.

关键词:

李树石是一种树石.金属阳极是一种金属阳极.人工SEII是一种人工SEI.静电屏蔽是一种静电屏蔽.化合金的化合金

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