Lithium Diffusion in LixCoO2 (0.45 < x < 0.7) Intercalation Cathodes
Mass transport and thermodynamic properties of Li{sub x}CoO{sub 2} were studied by the potentiostatic intermittent titration technique (PITT). We determined the chemical diffusion coefficient ({bar D}{sub Li}) and the thermodynamic factor ({Theta}) of Li in the region 0.45 < x < 0.7, where Li{sub x}CoO{sub 2} exists as a single phase having either a rhombohedral or a monoclinic structure. Solid-state thin-film batteries were used in order to ensure a well-defined diffusion geometry. Both {bar D}{sub Li} and {Theta} 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 (D{sub Li}) has a minimum at x = 0.5 associated with the Li vacancy ordering. As the degree of ordering increases, nonmonotonic variations of {bar D}{sub Li}, {Theta}, and D{sub Li} become more pronounced when approaching x = 0.5 in Li{sub x}CoO{sub 2}.
- Research Organization:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC05-00OR22725
- OSTI ID:
- 829399
- Report Number(s):
- P00-108853; TRN: US200610%%810
- Journal Information:
- Electrochemical and Solid-State Letters, Vol. 4, Issue 6
- Country of Publication:
- United States
- Language:
- English
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