采用高温固相法合成了锂离子电池正极材料LiFePO4及改性的LiFe0.9Ni0.1PO4和LiFe0.9Ni0.1PO4/C材料.采用X射线衍射仪和扫描电镜分析样品的晶体结构和表面形貌.结果表明:改性后的LiFe0.9Ni0.1PO4和LiFe0.9Ni0.1PO4/C材料与LiFePO4一样均为单一的橄榄石结构.以20 mA/g电流密度充放电,LiFe0.9Ni0.1PO4的首次放电容量为140 mA·h/g,较LiFePO4增加了12%;而复合掺杂得到的含碳量为2.8%的LiFe0.9Ni0.1PO4/C材料,首次放电容量达162 mA·h/g,充放电循环30次后放电电容量仍为147 mA·h/g,容量衰减仅为9%.当充放电电流密度提高到80 mA/g时,LiFePO4、LiFe0.9Ni0.1PO4和LiFe0.9Ni0.1PO4/C的放电容量分别为86、114和140 mA·h/g.改性后的LiFe0.9Ni0.1PO4/C的电化学性能得到了较大的改善.
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