Premium
Influence of Enhanced O 2 Provision on the Discharge Performance of Li–air Batteries by Incorporating Fluoroether
Author(s) -
Wan Hao,
Mao Ya,
Liu Zixuan,
Bai Qingyou,
Peng Zhe,
Bao Jingjing,
Wu Gang,
Liu Yang,
Wang Deyu,
Xie Jingying
Publication year - 2017
Publication title -
chemsuschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.412
H-Index - 157
eISSN - 1864-564X
pISSN - 1864-5631
DOI - 10.1002/cssc.201601725
Subject(s) - electrolyte , oxygen , separator (oil production) , cathode , mass transfer , oxygen transport , chemistry , air separation , chemical engineering , diffusion , solubility , electrode , thermodynamics , chromatography , organic chemistry , physics , engineering
Abstract As the first step during discharge, the mass transfer of oxygen should play a crucial role in Li–air batteries to tailor the growth of discharge products, however, not enough attention has been paid to this issue. Herein, we introduce an oxygen‐enriching cosolvent, 1,2‐(1,1,2,2‐tetrafluoroethoxy) ethane (FE1), into the electrolyte, and investigate its influence on the discharge performance. The incorporation of this novel cosolvent consistently enhances the oxygen solubility of the electrolyte, and improves the oxygen diffusivity following a volcano‐shape trend peaking at 50 % FE1. It is interesting that the discharge capacities obtained with the investigated electrolytes share the similar volcano trends as the oxygen transport under 50 mA g carbon −1 and higher current densities. The improved oxygen diffusion could benefit the volumetric utilization of the air cathode, especially at the separator side, probably owing to the fast oxygen transport to moderate its concentration gradient. Our results demonstrate the importance of oxygen provision, which easily becomes the capacity‐determining factor.