Synthesis and characterization of LiFePO_4/PPy composite powders

【Author】

Xiang-zhong Ren Xi Li Pei-xin Zhang Jian-hong Liu Qian-ling Zhang Zhong-kuan Luo School of chemistry and chemical engineering,Shenzhen University,Shenzhen 518060,China

【Abstract】

<正>A series of lithium iron phosphate/polypyrrole (LiFePO_4/PPy) composite powders were synthesized by chemical oxidation method with different doping agent and oxidation agent.The composite powders were characterized by scanning electron microscopy (SEM),Fourier Transform Infrared Spectrum (FTIR),and X-ray diffraction (XRD).The results showed that the composite powders composed of PPy and LiFePO_4.And the doping of polypyrrole in LiFePO_4 could weaken the XRD intensity of LiFePO_4,but could not destroy its crystallization.With the increase of pyrrole in LiFePO_4/PPy composite powders,the polypyrrole on the surface of LiFePO_4 increased and dispersed more homogeneously.Thermogravimetric analysis (TGA) data indicated the heat-stability of LiFePO_4/PPy was very good that the composite powders would not oxidate till 300℃in the air flow.

【Keywords】

LiFePO_4;;Polypyrrole;;Lithium ion battery;;doping;;composite powders

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