Li Diffusion and High-Voltage Cycling Behavior of Thin-Film LiCoO2 Cathodes

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Mass transport and thermodynamic properties of Li{sub x}CoO{sub 2} were studied by the potentiostatic intermittent titration technique (PITT) using solid-state thin-film batteries that provide a well-defined diffusion geometry. Both the chemical diffusion coefficient and the thermodynamic factor have minima at the phase boundaries of the Li/vacancy ordered phase ''Li{sub 0.5}CoO{sub 2}''. The self-diffusion coefficient of Li has a minimum at x = 0.5 associated with the Li/vacancy ordering. As the degree of ordering increases, the nonmonotonic variations become more pronounced when approaching x = 0.5 in Li{sub x}CoO{sub 2}. We also show that thin-film LiCoO{sub 2} cathodes having grains of ... continued below

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14 pages

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Jang, Y.-I. October 2, 2001.

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Mass transport and thermodynamic properties of Li{sub x}CoO{sub 2} were studied by the potentiostatic intermittent titration technique (PITT) using solid-state thin-film batteries that provide a well-defined diffusion geometry. Both the chemical diffusion coefficient and the thermodynamic factor have minima at the phase boundaries of the Li/vacancy ordered phase ''Li{sub 0.5}CoO{sub 2}''. The self-diffusion coefficient of Li has a minimum at x = 0.5 associated with the Li/vacancy ordering. As the degree of ordering increases, the nonmonotonic variations become more pronounced when approaching x = 0.5 in Li{sub x}CoO{sub 2}. We also show that thin-film LiCoO{sub 2} cathodes having grains of sub-micrometer size combined with the Li upon electrolyte exhibit excellent capacity retention when charged up to 4.5 V.

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14 pages

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  • 200th Mtg of the Electrochem. Society, 52nd Mtg of the Intl' Society of Electrochemistry, San Francisco, CA (US), 09/02/2001--09/07/2001

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  • Report No.: P01-110459
  • Grant Number: AC05-00OR22725
  • Office of Scientific & Technical Information Report Number: 788508
  • Archival Resource Key: ark:/67531/metadc722482

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  • October 2, 2001

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  • Sept. 29, 2015, 5:31 a.m.

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  • March 22, 2016, 3:01 p.m.

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Jang, Y.-I. Li Diffusion and High-Voltage Cycling Behavior of Thin-Film LiCoO2 Cathodes, article, October 2, 2001; Tennessee. (digital.library.unt.edu/ark:/67531/metadc722482/: accessed August 21, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.