通过无隔膜电池研究电解质对锂金属沉积和溶解的内在影响

IF 3.2 Q2 CHEMISTRY, PHYSICAL
Energy advances Pub Date : 2024-05-29 DOI:10.1039/D4YA00245H
Tomoki Takahashi, Di Wang, Jinkwang Hwang and Kazuhiko Matsumoto
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引用次数: 0

摘要

锂金属电池因其高能量密度而成为下一代能源存储的重要保证。然而,由于锂沉积/溶解过程中的问题,如库仑效率低、枝晶形成和死锂形成等,其商业化仍面临挑战。要应对这些挑战,需要精心设计电解质,通过改变溶解结构和工程界面来提高锂金属负极的可逆性。锂沉积/溶解的库仑效率是评估电解液对锂金属性能的最关键因素之一,但这受到各种因素的影响。本研究采用无隔膜电池,以尽量减少外在影响,并重点评估电解质对锂沉积/溶解的内在影响。研究了基于锂[PF6]、锂[FSA]和锂[TFSA]三种盐的 48 种不同电解质,这些电解质在溶剂中各不相同,有的含有添加剂,有的没有添加剂。此外,拉曼光谱和 X 射线光子光谱揭示了不同电解质条件下固体电解质相间成分主要种类的变化,从而加强了讨论。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Intrinsic effects of electrolytes on lithium metal deposition and dissolution investigated through a separator-free cell†

Intrinsic effects of electrolytes on lithium metal deposition and dissolution investigated through a separator-free cell†

Lithium metal batteries are a significant promise for next-generation energy storage due to their high energy density. However, challenges persist in their commercialization stemming from issues during the lithium deposition/dissolution processes, such as low Coulombic efficiency, dendrite formation, and dead-lithium formation. Addressing these challenges requires careful electrolyte design to enhance the reversibility of the lithium metal negative electrode by modifying solvation structures and engineering interfaces. The Coulombic efficiency of lithium deposition/dissolution is one of the most crucial factors in evaluating the performance of electrolytes toward lithium metal, although this is influenced by various factors. In this study, a separator-free cell is adopted to minimize extraneous influences and focus on assessing the intrinsic effects of electrolytes on lithium deposition/dissolution. 48 different electrolytes based on three salts of Li[PF6], Li[FSA] and Li[TFSA] varying in solvents were investigated with or without additives. Moreover, Raman spectroscopy and X-ray photon spectroscopy enhance the discussion by revealing variations in the major species of solid electrolyte interphase components under different electrolyte conditions.

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CiteScore
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