title: Understanding Moisture and Carbon Dioxide Involved Interfacial Reactions on Electrochemical Performance of Lithium-Air Batteries Catalyzed by Gold/Manganese-Dioxide.
abstract: Lithium-air (Li-air) battery works essentially based on the interfacial reaction of 2Li + O2 ↔ Li2O2 on the catalyst/oxygen-gas/electrolyte triphase interface. Operation of Li-air batteries in ambient air still remains a great challenge despite the recent development, because some side reactions related to moisture (H2O) and carbon dioxide (CO2) will occur on the interface with the formation of some inert byproducts on the surface of the catalyst. In this work, we investigated the effect of H2O and CO2 on the electrochemical performance of Li-air batteries to evaluate the practical operation of the batteries in ambient air. The use of a highly efficient gold/δ-manganese-dioxide (Au/δ-MnO2) catalyst helps to understand the intrinsic mechanism of the effect. We found that H2O has a more detrimental influence than CO2 on the battery performance when operated in ambient air. The battery operated in simulated dry air can sustain a stable cycling up to 200 cycles at 400 mA g(-1) with a relatively low polarization, which is comparable with that operated in pure O2. This work provides a possible method to operate Li-air batteries in ambient air by using optimized catalytic electrodes with a protective layer, for example a hydrophobic membrane.
authors.affiliation: State Key Laboratory of Silicon Materials, School of Materials Science and Engineering, Zhejiang University , Hangzhou 310027, China.
authors.forename: Guoqing
authors.initials: G
authors.lastname: Wang
authors.affiliation: State Key Laboratory of Silicon Materials, School of Materials Science and Engineering, Zhejiang University , Hangzhou 310027, China.
authors.forename: Liliang
authors.initials: L
authors.lastname: Huang
authors.affiliation: State Key Laboratory of Silicon Materials, School of Materials Science and Engineering, Zhejiang University , Hangzhou 310027, China.
authors.forename: Shuangyu
authors.initials: S
authors.lastname: Liu
authors.affiliation: State Key Laboratory of Silicon Materials, School of Materials Science and Engineering, Zhejiang University , Hangzhou 310027, China.|Key Laboratory of Advanced Materials and Applications for Batteries of Zhejiang Province , Hangzhou 310027, China.
authors.forename: Jian
authors.initials: J
authors.lastname: Xie
authors.affiliation: School of Materials Science and Engineering, Beijing University of Aeronautics and Astronautics , Beijing 100191, China.
authors.forename: Shichao
authors.initials: S
authors.lastname: Zhang
authors.affiliation: Industrial Technology Research Institute of Zhejiang University , Hangzhou 310058, China.
authors.forename: Peiyi
authors.initials: P
authors.lastname: Zhu
authors.affiliation: Key Laboratory of Advanced Materials and Applications for Batteries of Zhejiang Province , Hangzhou 310027, China.
authors.forename: Gaoshao
authors.initials: G
authors.lastname: Cao
authors.affiliation: State Key Laboratory of Silicon Materials, School of Materials Science and Engineering, Zhejiang University , Hangzhou 310027, China.|Key Laboratory of Advanced Materials and Applications for Batteries of Zhejiang Province , Hangzhou 310027, China.
authors.forename: Xinbing
authors.initials: X
authors.lastname: Zhao
keywords: ambient operation; carbon dioxide; gold/manganese-dioxide; interfacial reactions; lithium−air batteries; moisture