锂离子电池正极材料LiFePO₄的合成及其改性

采用共沉淀法合成了锂离子正极材料LiFePO₄,考察了不同合成条件对材料结构及性能的影响.研究结果表明:通过碳包覆改性后,LiFePO₄的容量可明显提高,SiO₂的掺杂对LiFePO₄的结构没有影响.同时讨论了上述两种改性方法对材料性能的影响机制.;Aseries of LiFePO₄ materials are synthesized by co-precipitation method.The structuraland electrochemical performances of materials under different synthesis conditions are examined.Modified LiFePO₄/C composites are synthesized by coating and doping,and examined by the suchmethods as XRD,SEM and constant current charge/discharge.The effects of modification areanatomized both qualitatively and quantitatively