Details

Autor(en) / Beteiligte

• Yang, Xulai
• Liu, Dajun
• Xu, Xiaoming
• He, Xuegang
• Xie, Jia

Titel

Mechanism and kinetic studies on the synthesis of LiFePO sub(4)viasolid-state reactions

Ist Teil von

• CrystEngComm, 2013-11, Vol.15 (48), p.10648-10656

Erscheinungsjahr

2013

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• Three classical iron sources including FePO sub(4).2H sub(2)O, FeC sub(2)O sub(4).2H sub(2)O and Fe sub(2)O sub(3) are explored to study the mechanism and kinetics of LiFePO sub(4) synthesis viasolid-state reactions. During the initial formation of LiFePO sub(4), the reactivity of FePO sub(4) appears to be higher than that of FeC sub(2)O sub(4) because the latter involves two stages including the decomposition of FeC sub(2)O sub(4) and then the formation of LiFePO sub(4). Fe sub(2)O sub(3) shows the lowest reactivity among the solid-state reactions. Meanwhile, the optimal sintering temperature for FePO sub(4) to form LiFePO sub(4) is lower than those for FeC sub(2)O sub(4).2H sub(2)O and Fe sub(2)O sub(3). A larger primary particle size should be responsible for the lower specific capacity of LiFePO sub(4) synthesized with micro-Fe sub(2)O sub(3). The kinetic mechanism for obtaining single-phase LiFePO sub(4) corresponds to the diffusion model, calculated by using Coats-Redfern and Doyle equations in which FeC sub(2)O sub(4).2H sub(2)O and FePO sub(4).2H sub(2)O obey 3-dimensional diffusion (cylinder, GB equation) and Fe sub(2)O sub(3) obeys 1-dimensional diffusion.