关键词: 磷酸铁, Ti⁴⁺, 电性能, 掺杂

Abstract: In order to improve the electrical performance of LiFePO₄， lead the LiFePO₄ doping process to the synthesis stage of iron phosphate， That’s adding Ti⁴⁺ to preparation the doped Ti⁴⁺ iron phosphate during the preparation process of iron phosphate. The results show that Ti⁴⁺ can replace Fe3+ into the iron phosphate lattice； The increase of Ti⁴⁺ will affects the crystal surface spacing of iron phosphate， and makes the （002） crystal plane spacing significantly increase， when the Ti⁴⁺ content reaches 0.5%， it has the greatest effect on the crystal surface spacing； The increase of crystal spacing is beneficial to the deem-bedding of Li+ and the electrical properties of lithium iron phosphate are enhanced. Compared with undoped iron phosphate， when iron phosphate doped with Ti⁴⁺， it produces a clear crystalline transition heat absorption peak at 600 ℃； The specific surface area of iron phosphate doped with Ti⁴⁺ is significantly higher than that of undoped iron phosphate， which indicates that the chemical activity of iron phosphate is improved when doped with Ti⁴⁺， which is beneficial to improving the electrical performance of lithium iron phosphate； Lithium iron phosphate prepared from iron phosphate doped with Ti4+ content 0.5%， the highest discharge capacity of LiFePO₄ is 160 mAh/g when capacitance is 0.2 C.

Key words: Iron phosphate, Ti4+, Electrical performance, Doping