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LiFePO₄ cathode materials were prepared by a solid-state method followed by one-step heat treatment. To improve the electrochemical properties of the LiFePO₄, acetylene black (AB), citric acid (CA), and pyrene are added as carbon source, respectively. The cyclic voltammetry (CV), AC impedance and galvanostatic charge/discharge testing results showed that using the LiFePO₄-C composite such as the AB carbon source exhibits higher discharge capacity and stability than the other composite. Synthesized LiFePO₄-C/Li cells (with AB) showed that initial discharge capacity was 140.65 mA h g^-1 and at the 2nd cycle were 145.87 mA h g^-1, respectively. Morphology and electrochemical performance of the LiFePO₄ cathode materials were investigated. Furthermore, the cell was subjected to current density studies (0.1 mA cm^-2) that suggested excellent capacity retention of the cell at 25°C.