Title: Stabilizing Li–O2 Batteries with Multifunctional Fluorinated Graphene

Authors: Xiaohong Wu, Xiaotong Wang, Zhengang Li, Libin Chen, Shiyuan Zhou, Haitang Zhang, Yu Qiao*, Hongjun Yue*, Ling Huang, and Shi-Gang Sun*

Abstract: As a full cell system with attractive theoretical energy density, challenges faced by Li–O₂ batteries (LOBs) are not only the deficient actual capacity and superoxide-derived parasitic reactions on the cathode side but also the stability of Li-metal anode. To solve simultaneously intrinsic issues, multifunctional fluorinated graphene (CF_x, x = 1, F-Gr) was introduced into the ether-based electrolyte of LOBs. F-Gr can accelerate O₂^– transformation and O₂^–-participated oxygen reduction reaction (ORR) process, resulting in enhanced discharge capacity and restrained O₂^–-derived side reactions of LOBs, respectively. Moreover, F-Gr induced the F-rich and O-depleted solid electrolyte interphase (SEI) film formation, which have improved Li-metal stability. Therefore, energy storage capacity, efficiency, and cyclability of LOBs have been markedly enhanced. More importantly, the method developed in this work to disperse F-Gr into an ether-based electrolyte for improving LOBs’ performances is convenient and significant from both scientific and engineering aspects.

Full-Link: https://pubs.acs.org/doi/10.1021/acs.nanolett.2c01713