通过高温固相合成法以MnCO_3为锰源、(MgCO_3)_4·Mg(OH)·5H_2O为镁源,葡萄糖为碳源,在氩气气氛下合成二元掺杂Mn、Mg的LiFe_(0.8)Mn_(0.1)Mg_(0.1)PO_4/C和LiFePO_4/C正极材料,采用X射线衍射(XRD)、扫描电子显微镜(SEM)、红外光谱仪(FT-IR)进行结构表征,通过恒电流充放电实验研究了LiFe_(0.8)Mn_(0.1)Mg_(0.1)PO_4/C和LiFePO_4/C电化学性能.结果表明,二元掺杂Mn、Mg的LiFe_(0.8)Mn_(0.1)Mg_(0.1)PO_4/C呈现橄榄石结构,无杂质产生.与未掺杂的LiFePO_4/C相比,掺杂后LiFe_(0.8)Mn_(0.1)Mg_(0.1)PO_4/C提高了电导率,0.1C倍率下放电可逆容量为131mAh/g,表现出良好的电化学性能.
LiFe_(0.8)Mn_(0.1)Mg_(0.1)PO_4/C and LiFePO_4/C were respectively prepared using MnCO_3 and (MgCO_3)_4·Mg(OH)_2·5H_2O,glucose as doping starting materials by high-temperature solid state reaction under Ar atmosphere.The prepared composites were characterized by X-ray diffraction,scanning electron microscope and FT-IR spectroscopic,and electrochemical performance was investigated with constant current charge-discharge experiment.The results showed that LiFe_(0.8)Mn_(0.1)Mg_(0.1)PO_4/C preserved olivine structure with no impurity.Compared with LiFePO_4/C,the electronic conductivity of LiFe_(0.8)Mn_(0.1)Mg_(0.1)PO_4/C has been improved.LiFe_(0.8)Mn_(0.1)Mg_(0.1)PO_4/C had a reversible capacity of 131mAh/g at 0.1C discharge rate,and showed good electrochemical properties.
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