title: Influence of Enhanced O2Provision on the Discharge Performance of Li-air Batteries by Incorporating Fluoroether.
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 gcarbon-1and 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.
authors.affiliation: Department of New Energy Technology, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo, 315201, P.R. China.|Nano Science and Technology Institute, University of Science and Technology of China, Suzhou, 215000, P.R. China.
authors.forename: Hao
authors.initials: H
authors.lastname: Wan
authors.affiliation: Shanghai Institute of Space Power Source, Shanghai, 200444, P.R. China.
authors.forename: Ya
authors.initials: Y
authors.lastname: Mao
authors.affiliation: Department of New Energy Technology, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo, 315201, P.R. China.
authors.forename: Zixuan
authors.initials: Z
authors.lastname: Liu
authors.affiliation: Shanghai Institute of Space Power Source, Shanghai, 200444, P.R. China.
authors.forename: Qingyou
authors.initials: Q
authors.lastname: Bai
authors.affiliation: Department of New Energy Technology, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo, 315201, P.R. China.
authors.forename: Zhe
authors.initials: Z
authors.lastname: Peng
authors.affiliation: Department of New Energy Technology, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo, 315201, P.R. China.|Nano Science and Technology Institute, University of Science and Technology of China, Suzhou, 215000, P.R. China.
authors.forename: Jingjing
authors.initials: J
authors.lastname: Bao
authors.affiliation: Department of Chemical and Biological Engineering, University at Buffalo, The State University of New York, Buffalo, 14260, United States.
authors.forename: Gang
authors.initials: G
authors.lastname: Wu
authors.affiliation: Materials Genome Institute, Shanghai University, Shanghai, 200444, P.R. China.
authors.forename: Yang
authors.initials: Y
authors.lastname: Liu
authors.affiliation: Department of New Energy Technology, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo, 315201, P.R. China.
authors.forename: Deyu
authors.initials: D
authors.lastname: Wang
authors.affiliation: Shanghai Institute of Space Power Source, Shanghai, 200444, P.R. China.
authors.forename: Jingying
authors.initials: J
authors.lastname: Xie
mesh_terms: D000388:Air; D004553:Electric Conductivity; D011211:Electric Power Supplies; D004980:Ethane / Q000737:chemistry*; D005019:Ethyl Ethers / Q000737:chemistry*; D008094:Lithium / Q000737:chemistry*; D010100:Oxygen / Q000737:chemistry*
chemical_list: D005019:Ethyl Ethers; D008094:Lithium; D004980:Ethane; D010100:Oxygen
keywords: fluorinated chemicals; lithium-air batteries; mass transfer; oxygen reduction; power sources