Several olivine phosphates were investigated in the last years as cathode materials for secondary lithium ion batteries. Among these compounds, LiFe <sub>x</sub> Co<sub>1∈-∈x</sub> PO<sub>4</sub> solid solutions might be interesting candidates because they should combine the high potential value of Co<sup>3+</sup>/Co<sup>2+</sup> (higher than 4.5 V vs Li<sup>+</sup>/Li) with the relatively high charge-discharge rate of LiFePO<sub>4</sub>. Solid solutions were prepared by solid-state route and characterised by X-ray powder diffraction, cyclic voltammetry, impedance spectroscopy and the Hebb-Wagner method. The results show that also low amount of iron induces high electronic conductivity in the solid solutions. © 2007 Springer-Verlag.
Mari, C., Ruffo, R., Morazzoni, F., Rosciano, F., Scotti, R. (2007). Electrical and electrochemical behaviour of several LiFe x Co1 − x PO4 solid solutions as cathode materials for lithium ion batteries. IONICS, 13(5), 287-291 [10.1007/s11581-007-0139-2].
Electrical and electrochemical behaviour of several LiFe x Co1 − x PO4 solid solutions as cathode materials for lithium ion batteries
MARI, CLAUDIO MARIA;RUFFO, RICCARDO;MORAZZONI, FRANCA;SCOTTI, ROBERTO
2007
Abstract
Several olivine phosphates were investigated in the last years as cathode materials for secondary lithium ion batteries. Among these compounds, LiFe x Co1∈-∈x PO4 solid solutions might be interesting candidates because they should combine the high potential value of Co3+/Co2+ (higher than 4.5 V vs Li+/Li) with the relatively high charge-discharge rate of LiFePO4. Solid solutions were prepared by solid-state route and characterised by X-ray powder diffraction, cyclic voltammetry, impedance spectroscopy and the Hebb-Wagner method. The results show that also low amount of iron induces high electronic conductivity in the solid solutions. © 2007 Springer-Verlag.
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