Abstract: In order to improve the electric conductivity and tap density of lithium iron phosphate, CaB₆ was used as a new additive for the first time. LiFePO₄ was synthesized by solid sate reaction and LiFePO₄/CaB₆ composite with different contents of CaB₆ was prepared by two different methods. The samples were characterized by granularity, morphology, electric conductivity, tap density, X-ray diffraction and charge-discharge performance. The results show that although the specific capacity of these materials doped with CaB₆ was not improved significantly, the tap density and electronic conductivity of these composites increased. The samples synthesized by the second method exhibit much better performance, and the electronic conductivity of the materials is enhanced by five orders of magnitude and the tap density by 65%.

Key words: LiFePO₄/CaB₆ composite, Electronic conductivity, Tap density, Unit cell parameter, Specific capacity