Effects of Fluorinated Diluents in Localized High-Concentration Electrolytes for Lithium-Oxygen Batteries

被引：55

作者：

Kwak, Won-Jin ^{[1
,2
]}

Lim, Hyung-Seok ^{[1
]}

Gao, Peiyuan ^{[3
]}

Feng, Ruozhu ^{[1
]}

Chae, Sujong ^{[1
]}

Zhong, Lirong ^{[1
]}

Read, Jeffrey ^{[4
]}

Engelhard, Mark H. ^{[5
]}

Xu, Wu ^{[1
]}

Zhang, Ji-Guang ^{[1
]}

机构：

[1] Pacific Northwest Natl Lab, Energy & Environm Directorate, Richland, WA 99354 USA

[2] Ajou Univ, Dept Chem, Suwon 16499, South Korea

[3] Pacific Northwest Natl Lab, Phys & Computat Sci Directorate, Richland, WA 99354 USA

[4] US Army Res Lab, Sensor & Electron Devices Directorate, Adelphi, MD 20783 USA

[5] Pacific Northwest Natl Lab, Environm Mol Sci Lab, Richland, WA 99354 USA

来源：

ADVANCED FUNCTIONAL MATERIALS | 2021年 / 31卷 / 02期

关键词：

batteries; diluents; electrolytes; lithium-oxygen batteries; localized high-concentration electrolytes; LI-O-2; METAL; SOLVENTS; ION;

D O I：

10.1002/adfm.202002927

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

A stable electrolyte is critical for practical application of lithium-oxygen batteries (LOBs). Although the ionic conductivity and electrochemical stability of the electrolytes have been extensively investigated before, their oxygen solubility, viscosity, volatility, and the stability against singlet oxygen (O-1(2)) still need to be comprehensively investigated to provide a full picture of the electrolytes, especially for an open system such as LOBs. Herein, a systematic investigation is reported on the localized high-concentration electrolytes (LHCEs) using different fluorinated diluents in comparison with those of conventional electrolytes. The physical properties and activation energies for reactions with singlet oxygen (O-1(2)) of these electrolytes are calculated by density functional theory. The electrochemical performances of LOBs using these electrolytes are compared. This study reveals that the correlation between the stability of the electrolytes and their physical and electrochemical properties depends strongly on the diluents in LHCEs. Therefore, it shines light on the rational design of new electrolytes for LOBs.

引用

页数：7

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