A simple, cheap soft synthesis routine for LiFeP04 using iron(III) raw material
Journal of Power Sources,Vol.167, No.1, 200-205, 2007 Wang LN, Zhang ZG,Zhang
An order olivine structure LiFePO4 wassynthesized with a simple theological phase reaction (RPR) of LiOHcenter dot H2O and FePO4 center dot 4H(2)O in the presence of PEGas a reductive agent and carbon source. A required amount of waterwas added to the starting materials to form the theologicalprecursor and decomposed at 700 degrees C to form the crystallinephase LiFePO4 directly, without ball-milling, preparation ofintermediates, pre-sintering and post-deposition treatment. Fineparticles with an average particle size about 216 nm are examinedby scanning electron microscopy (SEM) and optical particle sizeanalyzer. An initial discharge capacity of 157 mAh g(-1) wasachieved for the as-prepared LiFePO4 material with a rate of 0.1C(17 mA g(-1)), what's more, this material shows excellent specificcapacity, charge-discharge efficiency and cycle efficiency at highcurrent rates, almost no capacity loss can be observed up to 40cycles with the rate of 1, 2 and 3C at room temperature. Thesimple, cheap process as well as the excellent high-rateperformance makes this RPR method feasible commercially. (c) 2007Elsevier B.V. All rights reserved.
Synthesis for LiFePO4 material