Study On Preparation Of Carbon-based Polyaniline Composites As Electrode Material

The polymer lithium ion battery (PLIB)can be made into the ultrathin battery of wanton form and wanton size.Therefore it can be applied in spread area. The high-performance electrode material of lithium ion battery has become one of the key technologies in the study and development of high performance lithium ion battery. In this work, amorphous carbon material were prepared by means of low-temperature pyrolysis in the tube type furnace under N2 atmosphere using four kinds of precursor SF40, SF60, SF and PF. The effects of carbonization conditions, especially carburization temperature, on the electric conductivity and the structure of carbon material were investigated. The results show that the precursors have critical effect on the conductive performance of the carbon materials, and the conductivity of the carbon material increase gradually with the risingof carbonization temperature. The XRD and FTIR analysis of the carbon materials show that the carbon material prepared by different carbon matrix precursor have different crystallite structure and functional groups. With the rising of carbonization temperature, graphite crystallite in the carbon material become larger and larger in size , but the carbon material is still mainly characteristic of amorphism carbon. PANI/C composite was prepared by in-situ polymerization using the carbon materials. The results show that PANI/C composites have higher conductivity at the reaction condations in which are the polymerization temperature at 19℃, polymerization time at 14h, and An/C ratio at 1:1. The type of carbon material play important role in performance of PANI/C composite. The conductivity order of the PANI/C composites is in the sequence of PANI/1000SFC60>> PANI/1000SFC40～PANI/1000PFC> PANI/1000SFC. The structure of PANI/C composite is analyzed by FTIR, XRD, and SEM. The results show that the crystallinity of PANI in the PANI/C composites were decreased due to the limitation of nano-pore system in the carbon material. The morphology characteristic of PANI/SFC60 composite takes on porous powder clusters. The thermostability of PANI/C composites is analyzed by TG. The results show that the thermostability of PANI/C is higher than that of polyaniline and coal based PANI. A test battery was setup by using the PANI/C as cathode, and LiCoO2 as anode, and its properties of charge and discharge were measured. The results show that the performance of cathode material mainly depends on properties f the carbon used in the cathode material. The optimum carbon material that can be used in PANI/C composites cathode is 800SFC60, prepared by carbonization SF60 at 800 ℃.