共沉淀法制备锂离子电池正极材料lifepo4及其性能研究.pdf

36 / 2 5 6 LiFePO4 4 - - Synthesis of LiFePO by Liquid state Co precipitation M ethod and Its Performance , , ( , 1 81) , - , - YANG Wei CAO Chuan tang CAO Chuan bao ( M aterial Science Research Center , Beijing Institute of T echnology , Beijing 1 81, China) : LiFePO , X (XRD) ( SEM) 4 ( FTIR) , , LiFePO , 3.4V 4 , , . 2, . 4 / 2 , mA cm 142. 3, 127mAh/ g, 2 129. 7, 1 5. 5mAh/ g : ; ; LiFePO4; : T M912. 9: A : 1 1-4381 ( 2 5) 6- 36- 5 Abstract : The cathode materials of LiFePO4 were synthesized under liquid-state co-precipitation method. T he crystalline structures, morphology of particles, spectroscopic character w ere investigat- ed by X-ray diffraction, scanning electron microscopy and FT IR. Morphology of particles and elec- trochemical performance were also compared w ith that synthesized by solid-state reaction. T he re- 4 sults show ed that LiFePO w ere simple pure olive-type phase, and exhibit a 3. 4V discharge voltage 4 plateau. LiFePO as prepared possess