This research uses the Solid State method to produce LiNixFe1-xPO4 /C Composite Materials with variation Ni ion doping are x= 0.01, 0.02, and 0.03, Characterization was carried out using XRD, PSA, SEM and EIS. The results of XRD analysis showed that LiFePO4, Li3Fe2PO4 and Fe2O3 phases were formed. The conductivity test results show that the conductivity of the LFP/C precursor is 10.24x10-4 S/cm, the LiNi0.01Fe0.99PO4/C precursor is 7.75 x10-4 S/cm, the LiNi0.02Fe0.98PO4/C precursor is 10.334 x10-4 S/cm, and the precursor LiNi0.03Fe0.97PO4/C was 4.87 x10-4 S/cm . With the highest conductivity value at LiNi0.02Fe0.98PO4/C precursor.

The cathode material of LiNixFe1-x PO4 / C in this study was synthesized through a solid process, using Ni ion dopping variations concentration are x = 0.01, 0.02, and 0.03. Effect of dopping variations of Ni ions on cathode material characterized by microstructure and electrical properties using XRD, PSA, SEM and EIS. The results of the XRD analysis showed that LiFePO4, Li3Fe2PO4 and Fe2O3 phases were formed. Conductivity Test results showed that conductivity before dopping of LFP / C was 10.24x10-4 S / cm, and after dopping with Ni ion are x = 0.01; 0.02 and 0.03 have the respective electrical conductivities are LiNi0.01 Fe0.99 PO4 / C of 7.75 x10-4 S / cm, LiNi0.02 Fe0.98 PO4 / C of 10.334 x10-4 S / cm, and LiNi0.03 Fe0. 97 PO4 / C of 4.87 x10-4 S / cm. With the highest electrical conductivity value on the cathode LiNi0.02 Fe0.98 PO4 / C.