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LiFePO4 is a promising cathode material for lithium-ion batteries which has attracted much attention because of its high energy density, low cost and superior safety. LiFePO4 is synthesized using the citrate process in the oxygen and nitrogen atmospheres, and the crystal structure is analyzed by X-ray diffraction. The LiFePO4 synthesized in the nitrogen atmosphere shows the single phase of Olivine structure but the second phase of Fe2O3 in the oxygen atmosphere. The microstructure observation indicates that the porous flower-like particles appears in the nitrogen and oxygen atmospheres but more clear structure of LiFePO4 synthesized in nitrogen atmosphere. This study also compares the synthesis result of LiFePO4 depending on the existence of the Chelate process after nitrogen fixation of synthesis process. The LiFePO4 with the addition of Chelate process shows the single phase but spherical particles are observed. The electrochemical characteristics of LiFePO4 are evaluated using the coin cells. The LiFePO4 with no additional chelate process shows the maximum discharge capacity of 160mAh/g at 0.2C and 155mAh/g at 1C. The capacity shows no reduction after the cycle test of 45 times with the current rate of 1C. Meanwhile, after chelate process, the LiFePO4 shows 150mAh/g at 0.2C and 108mAh/g at 1C, which indicates substantial difference. After 5 cycles, its capacity has reduced more than 40mAh/g.

Synthesis of porous LiFePO<sub>4</sub> cathode material by citrate process for lithium ion battery