title: High-Performance Li-O2Batteries with Controlled Li2O2Growth in Graphene/Au-Nanoparticles/Au-Nanosheets Sandwich.
abstract: The working of nonaqueous Li-O2batteries relies on the reversible formation/decomposition of Li2O2which is electrically insulating and reactive with carbon and electrolyte. Realizing controlled growth of Li2O2is a prerequisite for high performance of Li-O2batteries. In this work, a sandwich-structured catalytic cathode is designed: graphene/Au-nanoparticles/Au-nanosheets (G/Au-NP/Au-NS) that enables controlled growth of Li2O2spatially and structurally. It is found that thin-layer Li2O2(below 10 nm) can grow conformally on the surface of Au NPs confined in between graphene and Au NSs. This unique crystalline behavior of Li2O2effectively relieves or defers the electrode deactivation with Li2O2accumulation and largely reduces the contact of Li2O2with graphene and electrolyte. As a result, Li-O2batteries with the G/Au-NP/Au-NS cathode exhibit superior electrochemical performance. A stable cycling of battery can last 300 times at 400 mA g-1when the capacity is limited at 500 mAh g-1. This work provides a practical design of catalytic cathodes capable of controlling Li2O2growth.
authors.affiliation: State Key Laboratory of Silicon Materials School of Materials Science and Engineering Zhejiang University Hangzhou 310027 P. R. 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 P. R. China.
authors.forename: Fangfang
authors.initials: F
authors.lastname: Tu
authors.affiliation: State Key Laboratory of Silicon Materials School of Materials Science and Engineering Zhejiang University Hangzhou 310027 P. R. China; Key Laboratory of Advanced Materials and Applicationsfor Batteries of Zhejiang Province Hangzhou 310027 P. R. China.
authors.forename: Jian
authors.initials: J
authors.lastname: Xie
authors.affiliation: Institute of Physical Chemistry Zhejiang Normal University Jinhua 321004 P. R. China.
authors.forename: Gaohui
authors.initials: G
authors.lastname: Du
authors.affiliation: School of Materials Science and Engineering Beijing University of Aeronautics and Astronautics Beijing 100191 P. R. China.
authors.forename: Shichao
authors.initials: S
authors.lastname: Zhang
authors.affiliation: Key Laboratory of Advanced Materials and Applicationsfor Batteries of Zhejiang Province Hangzhou 310027 P. R. 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 P. R. China; Key Laboratory of Advanced Materials and Applicationsfor Batteries of Zhejiang Province Hangzhou 310027 P. R. China.
authors.forename: Xinbing
authors.initials: X
authors.lastname: Zhao
keywords: Li2O2; Li–O2 batteries; catalysis; controlled growth; sandwich