Synthesis and Characterization of Highly-Conducting Nanocrystallized Li(Fe_(1-x)Mn_x)_(0.88)V_(0.08)PO_4 Cathode Materials (x = 0.25, 0.5, 0.75)

摘要

This research has shown that thermal nanocrystallization of glassy analogs of LiFe_(1-x)Mn_xPO_4 (with addition of vanadium for improvement of glass forming properties) resulted in highly conducting materials that may be used as a cathode in Li-ion battery. Three electrochemically active phases (i.e. LiFePO_4, LiMnPO_4, Li_3V_2(PO_4)_3) were detected in the samples. The electrical conductivity of nanocrystalline sample with x = 0.5 was ca. 10~(-3) S/cm at room temperature with activation energy of 0.15 eV. These values have been explained on the base of Mott's theory of electron hopping.