This paper describes the synthesis and the properties of a kinetically improved LiFePO 4 cathode material. The novel aspect of the synthesis is based on a critical step involving the dispersion of metal ͑e.g., copper or silver͒ at a very low concentration ͑1 wt %͒. This metal addition does not affect the structure of the cathode but considerably improves its kinetics in terms of capacity delivery and cycle life. Such an enhancement of the electrochemical properties has been ascribed to a reduction of the particle size and to an increase of the bulk intra-and interparticle electronic conductivity of LiFePO 4 , both effects being promoted by the finely dispersed metal powders. This improved conductivity favors the response of LiFePO 4 , thus substantiating its interest as new cathode for advanced lithium ion batteries.

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A Novel Concept for the Synthesis of an Improved LiFePO 4 Lithium Battery Cathode.-A kinetically improved LiFePO 4 cathode material is prepared by a sol-gel route involving the dispersion of Cu or Ag at a very low concentration (1 wt%). The metal dispersion does not affect the structure of the electrode material but substantially enhances its overall capacity. -(CROCE, F.; D' EPIFANIO, A.; HASSOUN, J.; DEPTULA, A.; OLCZAC, T.; SCROSATI, B.; Electrochem. Solid-State Lett. 5 (2002) 3, A47-A50; Dip.