The following document covers the determina- tion of the diffusion coefficient of two powder materials: LiFePO4 and LiMn2O4 by using potentiostatic intermittent titration technique (PITT) and impedance spectroscopy methodology and compares relevant results with the following relation: D 1⁄4 R2 I0 , which is obtained by solving 3aQ Fick’s spherical coordinate equation (where I0 is the initial step current in the PITT experiment, R is the particle radius, Q is the charge that intercalated during the step, and α is the percentage of the theoretical intercalated charge). This procedure allowed the verification of the validity of the spherical model for the powder materials, the accuracy of the expression proposed for the diffusion coefficient determination, and the correctness of the measures that had been taken.
Comparison between different ways to determine diffusion coefficient and by solving Fick’s equation for spherical coordinates / Dell'Era, Alessandro; Pasquali, Mauro. - In: JOURNAL OF SOLID STATE ELECTROCHEMISTRY. - ISSN 1432-8488. - 13:(2009), pp. 849-859. [10.1007/s10008-008-0598-z]
Comparison between different ways to determine diffusion coefficient and by solving Fick’s equation for spherical coordinates
DELL'ERA, Alessandro;PASQUALI, Mauro
2009
Abstract
The following document covers the determina- tion of the diffusion coefficient of two powder materials: LiFePO4 and LiMn2O4 by using potentiostatic intermittent titration technique (PITT) and impedance spectroscopy methodology and compares relevant results with the following relation: D 1⁄4 R2 I0 , which is obtained by solving 3aQ Fick’s spherical coordinate equation (where I0 is the initial step current in the PITT experiment, R is the particle radius, Q is the charge that intercalated during the step, and α is the percentage of the theoretical intercalated charge). This procedure allowed the verification of the validity of the spherical model for the powder materials, the accuracy of the expression proposed for the diffusion coefficient determination, and the correctness of the measures that had been taken.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.