Effect Of Carbon Support On The Behaviour Of Lifepo4/C Composite Electrodes For Lithium-Ion Batteries

JORGE THOMAS; CECH, O.; M. S. MORENO; H. CORSO; M. SEDLARIKOVA; J. VONDRAK; E.G. CALVO; J.A. MENENDEZ; ANA ARENILLAS; VISINTIN A.

Vichy

Congreso; 4th International Conference on Carbons for Energy Storage Conversion and Environment Protection CESEP 11; 2011

Conference on Carbons for Energy Storage/Conversion and Environment Protection CESEP’11

LiFePO4 composites seem to be a breakthrough material for high-power Li-ion rechargeable batteries because of their very good kinetic behaviour, thermal stability, cost and environmental harmlessness. However, LiFePO4 presents much poorer electronic conductivity than the widely used layered LiCoO2 material. Therefore, the research is now focused to improve its electrochemical performance by combination with a highly conductive material (i.e. carbon material). LiFePO4 samples were synthesized in-lab by a procedure already described in the bibliography1. Two different carbon support (carbon black Super P and expanded graphite) were used. The samples were physically characterized and HRTEM results show that in both syntheses core-shell structured nanoparticles were obtained. XRD analysis shows that these particles present one phase synthetic tripthylite-like ortorhombic space group and both of them have some small amount of impurity phases. SEM and textural characterization shows quite different porous structure between samples. From thermogravimetric analysis it was possible to differentiate the organic and inorganic content in the samples studied, being less than 4 wt% of carbon content in both samples.