基本理解和量化涉及离子电池中负电极的容量损失

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Le Anh Ma¹, Alexander Buckel¹, Andreas Hofmann²

¹Department of Chemistry-Ångström Laboratory, Uppsala University, Uppsala, SE-75121, Sweden.

Advanced science (Weinheim, Baden-Wurttemberg, Germany)

|December 7, 2023

概括

离子电池的容量损失与固体电解质间相 (SEI) 有关. 这项研究揭示了SEI形成,溶解和改造如何影响容量,电解质化学决定了损失的程度.

科学领域:

电化学电化学电化学
材料科学材料科学材料科学
储能储能储能储能储能储能

背景情况:

离子电池 (SIB) 面临容量损失的挑战,特别是由于固体电解质介相 (SEI).
与离子电池相比,SEI组件在SIB电解质中的溶解度更高加剧了这些问题.
了解与SEI相关的退化机制对于推进SIB技术至关重要.

研究的目的:

调查因SEI形成,解散,改革和捕获而导致的SIB产能损失.
分析电解质组成和SEI层特征对容量衰减的影响.
在不同电解质配方的不同开放电路暂停时间下量化容量损失.

主要方法:

使用电化学循环协议来模拟电池的性能.
基于同步子的X射线光电子光谱 (XPS) 分析了SEI的组成和结构.
气色谱-质谱 (GC-MS) 和质子核磁共振 (1H-NMR) 确定了电解质分解产物.

主要成果:

产能损失归因于最初的SEI形成,解体-改造周期和电荷泄漏.
电解质化学和SEI层稳定性之间的相互作用显著影响容量衰减的程度.
在EC/DEC中观察到NaPF6的最高容量损失 (5 μAh·h−1/2);在EC/DME中观察到NaTFSI的最低容量损失 (1.3 μAh·h−1/2).

结论:

电解质配方是缓解SIBS中SEI诱导的容量损失的关键因素.
定制电解质成分可以提高SEI层的稳定性,改善电池的寿命.
这项研究为设计电解质提供了见解,以尽量减少离子电池的降解.

关键词:

年龄化的衰老.电解质是一种电解质.离子电池离子电池固体电解质相间阶段

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