Journal of the Chilean Chemical Society
On-line version ISSN 0717-9707
WANG, LIAN-LIANG et al. PREPARATION AND SILVER MODIFICATION OF LIFEPO4/C FOR LI-ION BATTERIES. J. Chil. Chem. Soc. [online]. 2009, vol.54, n.2, pp. 144-146. ISSN 0717-9707. doi: 10.4067/S0717-97072009000200010.
LiFeP04/C and LiFeP04/C+Ag samples were prepared by sol-gel method. Samples were characterized by XRD, SEM, EIS and electrochemical discharge and charge tests. Silver modification does not affect the olivine structure of LiFeP04 but enhances its electrochemical performance in terms of discharge capacity and rate capacity. Discharge capacities are improved from 130.8 mAhg-1 of LiFeP04/Cto 149.8mAhg-1 of LiFeP04/C+Ag cathodes. EIS measurements show that Silver modification slightly decreases the charge transfer resistance of LiFePOyC, and lithium ion diffusion coefficient is enhanced from 2.89 x 10-14 to 8.17 x 10-13m2s-1.
Keywords : Li-ion battery; LiFePO /C; Silver modification; EIS; Li-ion diffusion coefficient.