Abstract
LiFePO4 has several advantages in comparison to transition metal oxide cathode material in commercial rechargeable lithium batteries. It has a high theoretical capacity (170 mAh/g). It occurs as the mineral triphylite in nature and is inexpensive, thermally stable, non-toxic and non-hygroscopic. However, its low intrinsic electronic conductivity (~ 10-9 S/cm) is problematic. We report here a study of the electronic properties of undoped LiFePO4 and Li doped material in which Li+ are substituted for Fe2+ ions in an attempt to increase the intrinsic electronic conductivity.