Journal
ELECTROCHIMICA ACTA
Volume 54, Issue 8, Pages 2329-2334Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2008.10.065
Keywords
Diffusion coefficient; CITT; Lithium iron phosphate; Lithium-ion batteries
Categories
Funding
- NNSF of China [20676152]
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Capacity intermittent titration technique (CITT) was used to investigate the chemical diffusion coefficient ((D) over tilde) of lithium-ion in LiFePO4 cathode material. The values of (D) over tilde at the galvano-charge current of 0.2 and 0.4 mA were respectively found to range from 8.8 x 10(-16) to 8.9 x 10(-14) cm(2) s(-1) and from 1.2 x 10(-16) to 8.5 x 10(-14) cm(2) s(-1) in the voltage range from 3.2 to 4V (vs. Li+/Li). The transfer coefficients of cathode (0.32-0.42) and anodic (0.26-0.3), and the standard rate constant (1.58 x 10(-9) to 1.30 x 10(-8) cm s(-1)) were measured from the Tafel plots of LiFePO4 in the equilibrium potential range from 3.06 to 3.45 V. From these kinetic parameters, the finite kinetics at interface was taken into) account to revise the above values of A The revised values of 1) at the galvano-charge current of 0.2 and 0.4 mA were respectively found to range from 2.44 x 10(-15) to 2.21 x 10(-13) cm(2) s(-1) and from 5.81 x 10(-16) to 3.22 x 10(-13) cm(2) s(-1) in the voltage range from 3.2 to 4V. Results show that the approximation of infinite charge-transfer kinetics leads to a spurious value of (D) over tilde which is lower than the revised value, and the spurious extent depends on the galvano-charge current of CITT experiment. (C) 2008 Elsevier Ltd. All rights reserved.
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