Abstract

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.