title: Compatible interface design of CoO-based Li-O2 battery cathodes with long-cycling stability.
abstract: Lithium-oxygen batteries with high theoretical energy densities have great potential. Recent studies have focused on different cathode architecture design to address poor cycling performance, while the impact of interface stability on cathode side has been barely reported. In this study, we introduce CoO mesoporous spheres into cathode, where the growth of crystalline discharge products (Li2O2) is directly observed on the CoO surface from aberration-corrected STEM. This CoO based cathode demonstrates more than 300 discharge/charge cycles with excessive lithium anode. Under deep discharge/charge, CoO cathode exhibited superior cycle performance than that of Co3O4 with similar nanostructure. This improved cycle performance can be ascribed to a more favorable adsorption configuration of Li2O2 intermediates (LiO2) on CoO surface, which is demonstrated through DFT calculation. The favorable adsorption of LiO2 plays an important role in the enhanced cycle performance, which reduced the contact of LiO2 to carbon materials and further alleviated the side reactions during charge process. This compatible interface design may provide an effective approach in protecting carbon-based cathodes in metal-oxygen batteries.
authors.affiliation: 1] Qingdao Industrial Energy Storage Research Institute, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao 266101, P. R. China [2] University of Chinese Academy of Sciences, Beijing 100049, P. R. China.
authors.forename: Chaoqun
authors.initials: C
authors.lastname: Shang
authors.affiliation: Qingdao Industrial Energy Storage Research Institute, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao 266101, P. R. China.
authors.forename: Shanmu
authors.initials: S
authors.lastname: Dong
authors.affiliation: 1] Qingdao Industrial Energy Storage Research Institute, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao 266101, P. R. China [2] University of Chinese Academy of Sciences, Beijing 100049, P. R. China.
authors.forename: Pu
authors.initials: P
authors.lastname: Hu
authors.affiliation: Qingdao Industrial Energy Storage Research Institute, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao 266101, P. R. China.
authors.forename: Jing
authors.initials: J
authors.lastname: Guan
authors.affiliation: Institute of Physics, Chinese Academy of Sciences, Beijing 100080, P. R. China.
authors.forename: Dongdong
authors.initials: D
authors.lastname: Xiao
authors.affiliation: Qingdao Industrial Energy Storage Research Institute, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao 266101, P. R. China.
authors.forename: Xiao
authors.initials: X
authors.lastname: Chen
authors.affiliation: Qingdao Industrial Energy Storage Research Institute, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao 266101, P. R. China.
authors.forename: Lixue
authors.initials: L
authors.lastname: Zhang
authors.affiliation: Institute of Physics, Chinese Academy of Sciences, Beijing 100080, P. R. China.
authors.forename: Lin
authors.initials: L
authors.lastname: Gu
authors.affiliation: Qingdao Industrial Energy Storage Research Institute, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao 266101, P. R. China.
authors.forename: Guanglei
authors.initials: G
authors.lastname: Cui
authors.affiliation: 1] Qingdao Industrial Energy Storage Research Institute, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao 266101, P. R. China [2] Institute of Physics, Chinese Academy of Sciences, Beijing 100080, P. R. China.
authors.forename: Liquan
authors.initials: L
authors.lastname: Chen