Effect of diketone additives on the performance of LiFePO4 cathode materials

• Main Authors: Fu-Chan Yang, 楊福泉
• Other Authors: Li-Fang Wang
• Format: Others
• Language: zh-TW
• Published: 2008
• Online Access: http://ndltd.ncl.edu.tw/handle/22245569724761503933

碩士 === 高雄醫學大學 === 藥學研究所碩士在職專班 === 96 === The study of lithium iron phosphate (LiFePO4) as cathode material of secondary lithium battery. The major obstacles of LiFePO4 application are the low intrinsic conductivity. The conductivity problems have two ways to solve, one is particle optimizing, it is easily to achieved by solution methods. Another is coating with the electronically conductive material like carbon, metal and metal oxide. The purpose of this research was to study the effect of aromatic diketones on the performance of the LiFePO4/C composite. A co-precipitation method was applied to prepare a series of LiFePO4/C materials by calcinating amorphous LiFePO4 with 5wt.%、10wt.%C8 and 5wt.%C6 diketone at 750°C. In this research, we studied to improve the low intrinsic conductivity. We adopt the co-precipitation and additive 5wt.%、10wt.%C8 compare with 5wt.%C6 diketone into LiFePO4 and pure LiFePO4. The effect of the diketone on its structure, surface morphology, surface area and electrochemical performance was investigated by X-ray diffraction(XRD)、scanning electron microscope (SEM)、energy dispersive spectroscopy (EDS)、Raman spectroscopy analyses、particle size analysis (PSA) 、brunauer-emmett-teller (BET) 、elemental analyzer(EA) 、cyclic voltammogram (CV) and galvanostatically charge / discharge techniques.