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

Abstract

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.

Authors:
Publication Date:
Research Org.:
Oak Ridge National Lab., TN (US)
Sponsoring Org.:
US Department of Energy (US)
OSTI Identifier:
788508
Report Number(s):
P01-110459
TRN: US200201%%219
DOE Contract Number:  
AC05-00OR22725
Resource Type:
Conference
Resource Relation:
Conference: 200th Mtg of the Electrochem. Society, 52nd Mtg of the Intl' Society of Electrochemistry, San Francisco, CA (US), 09/02/2001--09/07/2001; Other Information: PBD: 2 Oct 2001
Country of Publication:
United States
Language:
English
Subject:
25 ENERGY STORAGE; 37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; CATHODES; ELECTROLYTES; SELF-DIFFUSION; THERMODYNAMIC PROPERTIES; LITHIUM; LITHIUM OXIDES; COBALT OXIDES; MASS TRANSFER; ELECTRIC BATTERIES

Citation Formats

Jang, Y -I. Li Diffusion and High-Voltage Cycling Behavior of Thin-Film LiCoO2 Cathodes. United States: N. p., 2001. Web.
Jang, Y -I. Li Diffusion and High-Voltage Cycling Behavior of Thin-Film LiCoO2 Cathodes. United States.
Jang, Y -I. Tue . "Li Diffusion and High-Voltage Cycling Behavior of Thin-Film LiCoO2 Cathodes". United States. https://www.osti.gov/servlets/purl/788508.
@article{osti_788508,
title = {Li Diffusion and High-Voltage Cycling Behavior of Thin-Film LiCoO2 Cathodes},
author = {Jang, Y -I},
abstractNote = {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.},
doi = {},
url = {https://www.osti.gov/biblio/788508}, journal = {},
number = ,
volume = ,
place = {United States},
year = {2001},
month = {10}
}

Conference:
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