A Stable Lithium–Oxygen Battery Electrolyte Based on Fully Methylated Cyclic Ether
作者:Zhimei Huang、Haipeng Zeng、Meilan Xie、Xing Lin、Zhaoming Huang、Yue Shen、Yunhui Huang
DOI:10.1002/anie.201812983
日期:2019.2.18
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
基于醚的电解质由于其相对较高的稳定性而常用于Li-O 2电池(LOB)。但是它们仍然易于通过氢提取反应受到超氧化物或单线态氧的攻击,这导致长期运行期间性能下降。本文中,我们提出了甲基化的环状醚2,2,4,4,5,5-六甲基-1,3-二氧戊环(HMD),作为LOB的稳定电解质溶剂。这样的化合物在醚的α-碳上不包含任何氢原子,从而避免了氢的夺取反应。结果,该溶剂在超氧化物或单线态氧的存在下表现出优异的稳定性。另外CO 2禁止在充电过程中进化。使用基于HMD的电解质的LOB可以运行157个循环,是基于1,3-二氧戊环(DOL)或1,2-二甲氧基乙烷(DME)的电解质的LOB的4倍。