title: Batteries. In situ visualization of Li/Ag₂VP₂O₈ batteries revealing rate-dependent discharge mechanism.
abstract: The functional capacity of a battery is observed to decrease, often quite dramatically, as discharge rate demands increase. These capacity losses have been attributed to limited ion access and low electrical conductivity, resulting in incomplete electrode use. A strategy to improve electronic conductivity is the design of bimetallic materials that generate a silver matrix in situ during cathode reduction. Ex situ x-ray absorption spectroscopy coupled with in situ energy-dispersive x-ray diffraction measurements on intact lithium/silver vanadium diphosphate (Li/Ag2VP2O8) electrochemical cells demonstrate that the metal center preferentially reduced and its location in the bimetallic cathode are rate-dependent, affecting cell impedance. This work illustrates that spatial imaging as a function of discharge rate can provide needed insights toward improving realizable capacity of bimetallic cathode systems.
authors.affiliation: Brookhaven National Laboratory, 2 Center Street, Upton, NY 11973-5000, USA.
authors.forename: Kevin
authors.initials: K
authors.lastname: Kirshenbaum
authors.affiliation: Department of Chemistry, Stony Brook University, Stony Brook, NY 11794-3400, USA.
authors.forename: David C
authors.initials: DC
authors.lastname: Bock
authors.affiliation: Department of Chemical and Biological Engineering, University at Buffalo, Buffalo, NY 14260-4200, USA.
authors.forename: Chia-Ying
authors.initials: CY
authors.lastname: Lee
authors.affiliation: Brookhaven National Laboratory, 2 Center Street, Upton, NY 11973-5000, USA.
authors.forename: Zhong
authors.initials: Z
authors.lastname: Zhong
authors.affiliation: Department of Chemistry, Stony Brook University, Stony Brook, NY 11794-3400, USA. Department of Materials Science and Engineering, Stony Brook University, Stony Brook, NY 11794-2275, USA. kenneth.takeuchi.1@stonybrook.edu amy.marschilok@stonybrook.edu esther.takeuchi@stonybrook.edu.
authors.forename: Kenneth J
authors.initials: KJ
authors.lastname: Takeuchi
authors.affiliation: Department of Chemistry, Stony Brook University, Stony Brook, NY 11794-3400, USA. Department of Materials Science and Engineering, Stony Brook University, Stony Brook, NY 11794-2275, USA. kenneth.takeuchi.1@stonybrook.edu amy.marschilok@stonybrook.edu esther.takeuchi@stonybrook.edu.
authors.forename: Amy C
authors.initials: AC
authors.lastname: Marschilok
authors.affiliation: Brookhaven National Laboratory, 2 Center Street, Upton, NY 11973-5000, USA. Department of Chemistry, Stony Brook University, Stony Brook, NY 11794-3400, USA. Department of Materials Science and Engineering, Stony Brook University, Stony Brook, NY 11794-2275, USA. kenneth.takeuchi.1@stonybrook.edu amy.marschilok@stonybrook.edu esther.takeuchi@stonybrook.edu.
authors.forename: Esther S
authors.initials: ES
authors.lastname: Takeuchi