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Metal Mine ›› 2018, Vol. 47 ›› Issue (10): 115-120.

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Study on Preparation of Doping Iron Phosphate with Ti4+ in Mild Conditions

Luo Yanhua1,Pei Xiaodong1,He Nan2   

  1. 1. Sinosteel Anhui Tianyuan Technology Co., Ltd., Maanshan 243000, China;2. Sinosteel Maanshan Institute of Mining Research Co., Ltd., Maanshan 243000, China
  • Online:2018-10-15 Published:2018-11-09

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