Microstructure and electrochemical performance of LiFePO4 cathode materials modified with binuclear metal aminophthalocyanines

The monodispersed LiFe 1 − x M x PO 4 /C [ x ≈ 0.0040; M = Mn 2 + , Co 2 + , Ni 2 + , Cu 2 + , Zn 2 + ] nanocomposites obtained by LiFePO 4 modified with binuclear metal aminophthalocyanines (M 2 (PcTa) 2 O and M 2 (PcTa) 2 C(CF 3 ) 2 ) are utilized as positive electrode materials for lithium ion batteries. The preparation method for these nanocomposites is a controllable solvothermal method using a mixture of ethylene glycol and N , N -dimethylformamide as the solvent. The microstructure and electrochemical properties of the different nanocomposites are discussed and compared. The results show that the LiFePO 4 samples modified with M 2 (PcTa) 2 C(CF 3 ) 2 can improve the initial discharge specific capacity of the lithium ion battery up to 154.2 mAh.g − 1 at the rate of 0.1 C, and 93.5% of the initial discharge capacity could be retained after 50 cycles. This research shows that the proposed process can enhance the electrochemical performance of high power LiFePO 4 for lithium ion batteries.