Preparation and silver modification of lifepo4/c for li-ion batteries

• LIAN-LIANG WANG ^[1] ; PEI HUA MA ^[1] ; XIAN-MING WEN ^[1] ; KUN ZHANG ^[1] ; XIAO-CHUAN DENG ^[1]
  1. [1] Chinese Academy of Sciences

     Chinese Academy of Sciences

     China

     
• Localización: Journal of the Chilean Chemical Society (Boletín de la Sociedad Chilena de Química), ISSN-e 0717-6309, ISSN 0366-1644, Vol. 54, Nº. 2, 2009, págs. 144-146
• Idioma: inglés
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• Resumen

  • LiFeP0(4)/C and LiFeP0(4)/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 LiFeP0(4) but enhances its electrochemical performance in terms of discharge capacity and rate capacity. Discharge capacities are improved from 130.8 mAhg-1 of LiFeP0(4)/Cto 149.8mAhg-1 of LiFeP0(4)/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.