【摘要】 采用溶胶-碳热法制备Li MxFe1-xPO4/C〔M=Mg,Ni;x=0,0.06〕复合正极材料,通过XRD、SEM、恒流充放电和循环伏安等测试方法研究了Mg和Ni掺杂对材料结构,形貌和电化学性能的影响。结果表明:Mg和Ni的适量掺杂并未改变材料的结构和形貌,但材料的充放电性能、循环稳定性和可逆性明显提升。Li Ni0.06Fe0.94PO4/C的比容量、容量保持率均优于Li Mg0.06Fe0.94PO4/C。更多还原

【Abstract】 The Li Fe PO4/C and doped Li MxFe1-xPO4/C 〔M=Mg, Ni; x=0.06〕compounds have been prepared via a sol-carbon thermal method. The influence of Mg or Ni doping on the structure, morphology and electrochemical performances of Li Fe PO4/C were studied by X-ray diffraction(XRD),scanning electron microscope(SEM), constant current charging-discharging and cyclic voltammetry(CV) tests. The results showed that the structure and morphology of Mg or Ni doped Li Fe PO4/C did not change obviously, but the charging-discharging performances, cycling stability and reversibility were improved remarkably. The electrochemical performances of Li Ni0.06Fe0.94PO4/C including specific capacity and capacity retention ratio exhibited better than those of Li Mg0.06Fe0.94PO4/C.更多还原