title: From O2-to HO2-: Reducing By-Products and Overpotential in Li-O2Batteries by Water Addition.
abstract: The development of aprotic Li-O2batteries, which are promising candidates for high gravimetric energy storage devices, is severely limited by superoxide-related parasitic reactions and large voltage hysteresis. The fundamental reaction pathway of the aprotic Li-O2battery can be altered by the addition of water, which changes the discharge intermediate from superoxide (O2-) to hydroperoxide (HO2-). The new mechanism involving HO2-intermediate realizes the two-electron transfer through a single step, which significantly suppresses the superoxide-related side reactions. Moreover, addition of water also triggers a solution-based pathway that effectively reduces the voltage hysteresis. These discoveries offer a possible solution for desirable Li-O2batteries free of aggressive superoxide species, highlighting the design strategy of modifying the reaction pathway for Li-O2electrochemistry.
authors.affiliation: Energy Technology Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), 1-1-1, Umezono, Tsukuba, 305-8568, Japan.|Graduate School of System and Information Engineering, University of Tsukuba, 1-1-1, Tennoudai, Tsukuba, 305-8573, Japan.
authors.forename: Yu
authors.identifier: 0000-0002-2191-3875
authors.initials: Y
authors.lastname: Qiao
authors.affiliation: Energy Technology Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), 1-1-1, Umezono, Tsukuba, 305-8568, Japan.|Graduate School of System and Information Engineering, University of Tsukuba, 1-1-1, Tennoudai, Tsukuba, 305-8573, Japan.
authors.forename: Shichao
authors.initials: S
authors.lastname: Wu
authors.affiliation: Energy Technology Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), 1-1-1, Umezono, Tsukuba, 305-8568, Japan.
authors.forename: Jin
authors.identifier: 0000-0001-6203-1281
authors.initials: J
authors.lastname: Yi
authors.affiliation: Energy Technology Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), 1-1-1, Umezono, Tsukuba, 305-8568, Japan.
authors.forename: Yang
authors.initials: Y
authors.lastname: Sun
authors.affiliation: Energy Technology Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), 1-1-1, Umezono, Tsukuba, 305-8568, Japan.|National Laboratory of Solid State Microstructures & Department of Energy Science and Engineering, Nanjing University, Nanjing, 210093, P.R. China.
authors.forename: Shaohua
authors.identifier: 0000-0003-0818-8354
authors.initials: S
authors.lastname: Guo
authors.affiliation: National Laboratory of Solid State Microstructures & Department of Energy Science and Engineering, Nanjing University, Nanjing, 210093, P.R. China.
authors.forename: Sixie
authors.initials: S
authors.lastname: Yang
authors.affiliation: National Laboratory of Solid State Microstructures & Department of Energy Science and Engineering, Nanjing University, Nanjing, 210093, P.R. China.
authors.forename: Ping
authors.initials: P
authors.lastname: He
authors.affiliation: Energy Technology Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), 1-1-1, Umezono, Tsukuba, 305-8568, Japan.|Graduate School of System and Information Engineering, University of Tsukuba, 1-1-1, Tennoudai, Tsukuba, 305-8573, Japan.|National Laboratory of Solid State Microstructures & Department of Energy Science and Engineering, Nanjing University, Nanjing, 210093, P.R. China.
authors.forename: Haoshen
authors.identifier: 0000-0001-8112-3739
authors.initials: H
authors.lastname: Zhou
keywords: Li-O2 battery; hydroperoxide; superoxide; water additive