CAJ | 학술논문

　　以FePO4·2H2 O为铁源，LiOH· H2 O为锂源，蔗糖为碳源和还原剂，用碳热还原法制备得到LiFePO4/C复合正极材料。用X射线衍射法（XRD）、恒流充放电技术及循环伏安（CV）和交流阻抗（EIS）考察还原温度和还原时间对碳热还原合成材料结构和电化学性能的影响。结果表明，还原温度650℃、还原时间8.5 h条件下所得材料为单相橄榄石结构，10C放电比容量达121.8 mAh/g，循环100次后容量保持率为100％，具有良好的倍率性能和循环性能。研究结果可促进该材料在锂离子动力电池中的应用。
　　이FePO4·2H2 O위철원，LiOH· H2 O위리원，자당위탄원화환원제，용탄열환원법제비득도LiFePO4/C복합정겁재료。용X사선연사법（XRD）、항류충방전기술급순배복안（CV）화교류조항（EIS）고찰환원온도화환원시간대탄열환원합성재료결구화전화학성능적영향。결과표명，환원온도650℃、환원시간8.5 h조건하소득재료위단상감람석결구，10C방전비용량체121.8 mAh/g，순배100차후용량보지솔위100％，구유량호적배솔성능화순배성능。연구결과가촉진해재료재리리자동력전지중적응용。
The LiFePO4/C composites were synthesized by the carbothermal reduction using FePO 4 · 2H2O and LiOH· H2 O as raw materials and sucrose as reductive agent and carbon source.The effects of synthetic temperature and time on the structure and electrochemical performances of LiFe -PO4/C composites were studied.The LiFePO4/C was analyzed by X-ray diffraction ( XRD) , charge-discharge test, electrochemical impedance spectroscopy ( EIS) and cyclic voltammetry ( CV).The results showed that the LiFePO 4/C sample prepared with a sintering temperature of 650 ℃ and a sintering time of 8.5 h, formed the olivine structure with the space group Pnmb.Electrochemical tests indicated that this LiFePO 4/C sample delivered a discharge special capacity of 121.8 mAh/g with a capacity retention rate of 100%after 100 cycles at 10C, exhibiting good rate performance and cycle performance.These advantages were useful for the application of power batteries .