title: Potassium Ions Promote Solution-Route Li2O2Formation in the Positive Electrode Reaction of Li-O2Batteries.
abstract: Lithium-oxygen system has attracted much attention as a battery with high energy density that could satisfy the demands for electric vehicles. However, because lithium peroxide (Li2O2) is formed as an insoluble and insulative discharge product at the positive electrode, Li-O2batteries have poor energy capacities. Although Li2O2deposition on the positive electrode can be avoided by inducing solution-route pathway using electrolytes composed of high donor number (DN) solvents, such systems generally have poor stability. Herein we report that potassium ions promote the solution-route formation of Li2O2. The present findings suggest that potassium or other monovalent ions have the potential to increase the volumetric energy density and life cycles of Li-O2batteries.
authors.affiliation: Global Research Center for Environment and Energy based on Nanomaterials Science, National Institute of Material Science , 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan.
authors.forename: Shoichi
authors.initials: S
authors.lastname: Matsuda
authors.affiliation: Global Research Center for Environment and Energy based on Nanomaterials Science, National Institute of Material Science , 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan.
authors.forename: Yoshimi
authors.initials: Y
authors.lastname: Kubo
authors.affiliation: Global Research Center for Environment and Energy based on Nanomaterials Science, National Institute of Material Science , 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan.
authors.forename: Kohei
authors.initials: K
authors.lastname: Uosaki
authors.affiliation: Research Center for Solar Energy Chemistry, Osaka University , 1-3 Machikaneyama, Toyonaka, Osaka 560-8531, Japan.
authors.forename: Shuji
authors.identifier: http://orcid.org/0000-0002-3313-2689
authors.initials: S
authors.lastname: Nakanishi