Premium
A Stable Lithium–Oxygen Battery Electrolyte Based on Fully Methylated Cyclic Ether
Author(s) -
Huang Zhimei,
Zeng Haipeng,
Xie Meilan,
Lin Xing,
Huang Zhaoming,
Shen Yue,
Huang Yunhui
Publication year - 2019
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.201812983
Subject(s) - dimethoxyethane , electrolyte , lithium (medication) , ether , chemistry , solvent , oxygen , singlet oxygen , hydrogen , photochemistry , inorganic chemistry , organic chemistry , electrode , medicine , endocrinology
Ether‐based electrolytes are commonly used in Li–O 2 batteries (LOBs) because of their relatively high stability. But they are still prone to be attacked by superoxides or singlet oxygen via hydrogen abstract reactions, which leads to performance decaying during long‐term operation. Herein we propose a methylated cyclic ether, 2,2,4,4,5,5‐hexamethyl‐1,3‐dioxolane (HMD), as a stable electrolyte solvent for LOBs. Such a compound does not contain any hydrogen atoms on the alpha‐carbon of the ether, and thus avoids hydrogen abstraction reactions. As the result, this solvent exhibits excellent stability with the presence of superoxide or singlet oxygen. In addition the CO 2 evolution during charge process is prohibited. The LOB with HMD‐based electrolyte was able to run up to 157 cycles, 4 times more than with 1,3‐dioxolane (DOL) or 1,2‐dimethoxyethane (DME) based electrolytes.