Synthesis of LiFePO4/polyacenes using iron oxyhydroxide as an iron source

✍ Scribed by Guiling Yang; Xianfa Zhang; Jing Liu; Xingguang He; Jiawei Wang; Haiming Xie; Rongshun Wang

• Publisher: Elsevier Science
• Year: 2010
• Tongue: English
• Weight: 736 KB
• Volume: 195
• Category: Article
• ISSN: 0378-7753
• DOI: 10.1016/j.jpowsour.2009.08.060

✦ Synopsis

LiFePO 4 /polyacenes (PAS) composite is synthesized by iron oxyhydroxide as a new raw material and phenol-formaldehyde resin as both reducing agent and carbon source. The mechanism of the reaction is outlined by the analysis of XRD, FTIR as well as TG/DSC. The results show that the formation of LiFePO 4 is started at 300 • C, and above 550 • C, the product can be mainly ascribed to olivine LiFePO 4 . The electrochemical properties of the synthesized composites are investigated by charge-discharge tests. It is found that the prepared sample at 750 • C (S750) has a better electrochemical performance than samples prepared at other temperatures. A discharge capacity of 158 mAh g -1 is delivered at 0.2 C. Under high discharge rate of 10 C, a discharge capacity of 145 mAh g -1 and good capacity retention of 93% after 800 cycles are achieved. The morphology of S750 and PAS distribution in it are investigated by SEM and TEM.