LiFePO sub(4)/C Cathode Material Modified by Polyacrylamide

LiFePO sub(4)/C composite cathode materials containing different amounts of PAM as dispersing agent were synthesized by controlled crystallization-carbon thermal reduction process, to investigate the effect of polyacrylamide(PAM) on the performance of LiFePO sub(4)/C. Crystal structure, surface morphology and electrochemical properties of the obtained composites dispersed by PAM were studied by the techniques including thermal chemical analysis, X-ray diffraction, scanning electron microscopy, carbon content test, constant current charge and discharge testing. The results showed that LiFePO sub(4) material fabricated with 1.5wt%PAM dissolved in acid dispersed more evenly with good flow ability with average particle size of about 100 nm. The first discharge capacities of 1.5wt%PAM-LFP composites were 153.8, 142.5, 138.4, 128.7 and 124.3 m Ah/g at 0.1C, 1C, 2C, 5C and 10 C ratios, respectively, which capacity retention can keep above 99% at 1C rate after 100 charge/discharge cycles. According to AC impedance sp