准固态电池用聚合物离子液体功能设计调制锂金属界面结构

IF 5.5 3区 材料科学 Q2 CHEMISTRY, PHYSICAL
Wooyoung Jeong, Young-Jun Kim* and Jong-Won Lee*, 
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引用次数: 0

摘要

尽管锂金属阳极具有巨大的潜力,但锂金属的高反应性和枝晶生长阻碍了锂金属电池的稳定运行。为了稳定电解液和锂金属阳极之间的界面,引入了人工锂保护层。在这项研究中,我们提出了一种功能设计的聚合物离子液体(PIL)用于准固态电池中锂金属阳极的界面稳定。聚阳离子PIL被设计成在PIL/Li上形成导电和坚固的界面,同时作为有效的静电屏蔽来抑制枝晶的生长。除了优化了PIL中易于Li+传输动力学的成分外,PIL中的阴离子构型被设计为产生高离子导电性的Li3N,并增加固体电解质界面中LiF的浓度。在准固态电解质和高负载LiNi0.8Co0.1Mn0.1O2阴极(4 mAh cm-2)下,涂覆PIL的Li-metal电极(PIL厚度~ 5 μm)在Li对称电池和满电池中表现出界面电阻降低和循环性能增强的特点。这些发现为在电解质和锂金属阳极之间构建稳定界面的保护PIL层的设计提供了见解。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Modulating Lithium Metal Interphase Structures via Functional Design of Polymeric Ionic Liquids for Quasi-Solid-State Batteries

Modulating Lithium Metal Interphase Structures via Functional Design of Polymeric Ionic Liquids for Quasi-Solid-State Batteries

Despite the great potential of Li-metal anodes, the high reactivity of Li metal and dendritic Li growth hinder the stable operation of Li-metal batteries. Artificial Li protective layers have been introduced as a solution to stabilize the interface between the electrolyte and the Li-metal anode. In this study, we propose a functionally designed polymeric ionic liquid (PIL) for the interfacial stabilization of Li-metal anodes in quasi-solid-state batteries. Polycationic PILs are designed to form conductive and robust interphases at the PIL/Li while serving as an effective electrostatic shield to suppress dendrite growth. In addition to the optimized composition for facile Li+ transport kinetics in the PIL, the anion configurations in the PIL are engineered to produce highly ionic-conductive Li3N and to increase the concentration of LiF in the solid–electrolyte interphase. A PIL-coated Li-metal electrode (PIL thickness ∼5 μm) exhibits reduced interfacial resistance and enhanced cycling performances for the Li symmetric cell and full cell with a quasi-solid-state electrolyte and a high-loading LiNi0.8Co0.1Mn0.1O2 cathode (4 mAh cm–2). These findings provide insights into the design of protective PIL layers for constructing a stable interface between the electrolyte and the Li-metal anode.

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来源期刊
ACS Applied Energy Materials
ACS Applied Energy Materials Materials Science-Materials Chemistry
CiteScore
10.30
自引率
6.20%
发文量
1368
期刊介绍: ACS Applied Energy Materials is an interdisciplinary journal publishing original research covering all aspects of materials, engineering, chemistry, physics and biology relevant to energy conversion and storage. The journal is devoted to reports of new and original experimental and theoretical research of an applied nature that integrate knowledge in the areas of materials, engineering, physics, bioscience, and chemistry into important energy applications.
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