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Patent
Planar Energy Devices Inc and Battelle | Date: 2012-12-21

A method of making a cathode for a battery includes the steps of depositing a precursor cathode film having a first crystallinity profile. The precursor cathode film is annealed by irradiating the precursor cathode film with from 1 to 100 photonic pulses having a wavelength of from 200 nm to 1600 nm, a pulse duration of from 0.01 s and 5000 s and a pulse frequency of from 1 nHz to 100 Hz. The photonic pulses are continued until the precursor cathode film has recrystallized from the first crystallinity profile to a second crystallinity profile.


Tran B.,University of Central Florida | Tran B.,Planar Energy Devices Inc | Oladeji I.O.,Planar Energy Devices Inc | Wang Z.,Planar Energy Devices Inc | And 4 more authors.
Journal of the Electrochemical Society | Year: 2012

We report the first aqueous process fabrication of thick, flexible, and fully compressed lithium ion battery cathodes exceeding 200 μm in thickness using an adhesive, elastomeric, and ionically conductive PEG-based copolymer binder. The binder was synthesized through the statistical copolymerization of poly(ethylene glycol) methyl ether methacrylates (PEGMA), methyl methacrylate (MMA), and isobutyl vinyl ether (IBVE) in optimal proportions. Using standard LiCoO2 as active material, dense and flexible cathode films can withhold active mass loadings over 30 mg/cm2 which deliver 4.53 mAh/cm 2 with 94% capacity retention at C/2-rate. Electrodes were fabricated by casting aqueous cathode slurries onto nickel foam, followed by drying and hard calendar compression at 10 tons/cm2. Coordinating the binder with lithium salt plays a crucial role in activating the cathode. © 2012 The Electrochemical Society. Source


Tran B.,University of Central Florida | Tran B.,Planar Energy Devices Inc | Oladeji I.O.,Planar Energy Devices Inc | Wang Z.,Planar Energy Devices Inc | And 4 more authors.
Electrochimica Acta | Year: 2013

We report the first fully compressed Li4Ti5O 12 electrode designed by an aqueous process. An adhesive, elastomeric, and lithium ion conductive PEG-based copolymer is used as a binder for the aqueous fabrication thick, flexible, and densely packed Li 4Ti5O12 (LTO) electrodes. Self-adherent cathode films exceeding 200 μm in thickness and withholding high active mass loadings of 28 mg/cm2 deliver 4.2 mAh/cm2 at C/2 rate. Structurally defect-free electrodes are fabricated by casting aqueous cathode slurries onto nickel foam, dried, and hard-calendared at 10 tons/cm2. As a multifunctional material, the binder is synthesized by the copolymerization of poly(ethylene glycol) methyl ether methacrylate (PEGMA), methyl methacrylate (MMA), and isobutyl vinyl ether (IBVE) in optimal proportions. Furthermore, coordinating the binder with lithium salt is necessary for the electrode to function. © 2012 Elsevier Ltd. All rights reserved. Source

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