title: New high capacity cathode materials for rechargeable Li-ion batteries: vanadate-borate glasses.
abstract: V2O5 based materials are attractive cathode alternatives due to the many oxidation state switches of vanadium bringing about a high theoretical specific capacity. However, significant capacity losses are eminent for crystalline V2O5 phases related to the irreversible phase transformations and/or vanadium dissolution starting from the first discharge cycle. These problems can be circumvented if amorphous or glassy vanadium oxide phases are employed. Here, we demonstrate vanadate-borate glasses as high capacity cathode materials for rechargeable Li-ion batteries for the first time. The composite electrodes of V2O5 - LiBO(2) glass with reduced graphite oxide (RGO) deliver specific energies around 1000 Wh/kg and retain high specific capacities in the range of ~ 300 mAh/g for the first 100 cycles. V2O5 - LiBO(2) glasses are considered as promising cathode materials for rechargeable Li-ion batteries fabricated through rather simple and cost-efficient methods.
authors.affiliation: 1] ETH Zurich, Department of Chemistry and Applied Biosciences, CH-8093 Zurich, Switzerland [2] ETH Zurich, Department of Materials, CH-8093 Zurich, Switzerland.
authors.forename: Semih
authors.initials: S
authors.lastname: Afyon
authors.affiliation: ETH Zurich, Department of Chemistry and Applied Biosciences, CH-8093 Zurich, Switzerland.
authors.forename: Frank
authors.initials: F
authors.lastname: Krumeich
authors.affiliation: ETH Zurich, Department of Chemistry and Applied Biosciences, CH-8093 Zurich, Switzerland.
authors.forename: Christian
authors.initials: C
authors.lastname: Mensing
authors.affiliation: Empa - Swiss Federal Laboratories for Materials Science &Technology, CH-8600 Dübendorf Switzerland.
authors.forename: Andreas
authors.initials: A
authors.lastname: Borgschulte
authors.affiliation: ETH Zurich, Department of Chemistry and Applied Biosciences, CH-8093 Zurich, Switzerland.
authors.forename: Reinhard
authors.initials: R
authors.lastname: Nesper