Synthesis of Mg-LiFePO4/C composite using intermediate FePO4·2H2O from Fe3(PO4)2·8H2O as precursor via an aqueous rheological phase assisted method

• Published in: Journal of materials science. Materials in electronics 2016-09, Vol.27 (9), p.9398-9404
• Main Authors: Li, Yuanchao, Hao, Jinghao, Wei, Fengli, Fu, Lei, Liu, Yu, Wang, Zhongju, Yang, Changchun, Li, Baojun
• Format: Article
• Language: English
• Subjects: Characterization and Evaluation of Materials; Chemistry and Materials Science; Materials Science; Optical and Electronic Materials
• ISSN: 0957-4522; 1573-482X
• DOI: 10.1007/s10854-016-4983-6

In this work, a Mg-LiFePO 4 /C composite was synthesized by an aqueous rheological phase assisted method using intermediate FePO 4 ·2H 2 O, which was prepared from lost cost Fe 3 (PO 4 ) 2 ·8H 2 O precursor. The oxidation process of Fe 3 (PO 4 ) 2 ·8H 2 O, rheological phase technology and Mg ion doping improved the purity, elements uniformity, as well as ionic and electronic conductivities of LiFePO 4 materials, resulting in the enhanced electrochemical performances of Mg-LiFePO 4 /C composites. The as-synthesized Mg-LiFePO 4 /C composite exhibited higher specific capacity and more superior rate capability with a discharge capacity of 153 mAh g −1 at 0.2 C and 130 mAh g −1 at 5 C, compared with the undoped LiFePO 4 /C and the Mg-LiFePO 4 /C composite synthesized directly using the Fe 3 (PO 4 ) 2 ·8H 2 O as precursor. This provides an economical and environmentally friendly way for production of LiFePO 4 materials as cathode material in lithium ion batteries.