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碳包覆镍掺杂LiFePO4正极材料的合成与电化学性能
Synthesis and Electrochemical Performances of Carbon-Coated and Ni-Doped LiFePO4 Anode Materials
【摘要】 采用水热法在160℃下合成了单相橄榄石结构的LiFePO4和LiFe0.95Ni0.05PO4。经550℃聚丙稀裂解碳包覆后得到LiFePO4/C的颗粒尺寸在200nm左右,碳包覆镍掺杂LiFe0.95Ni0.05PO4/C的颗粒尺寸在100nm以下。电化学测试结果表明:LiFePO4/C和LiFe0.95Ni0.05PO4/C的0.1C首次充放电可逆容量分别达到154mAh?g?1和149mAh?g?1,但掺镍的LiFe0.95Ni0.05PO4/C具有更优异的大电流充放电循环特性,0.5C和1C充放电100次后的放电容量分别达到147mAh?g?1和134mAh?g?1。
【Abstract】 Composite anode materials LiFePO4/C and LiFe0.95Ni0.05PO4/C were prepared by hydrothermal synthesis at 160℃, followed by carbon-coating at 550℃ using polypropylene as the carbon source LiFePO4/C with fine. particle sizes of about 200 nm and LiFe0.95Ni0.05PO4/C with less than 100 nm were observed. The first discharge capacities of 154 mAh?g?1and 149 mAh?g?1 were obtained for LiFePO4/C and LiFe0.95Ni0.05PO4/C at 0.1 C, respectively. It is found that the nickel doped material, LiFe0.95Ni0.05PO4/C, possesses good high-rate cycling properties. The reversible capacity of LiFe0.95Ni0.05PO4/C maintains 147 mAh?g?1 or 134 mAh?g?1 after 100 cycles at 0.5 C or 1 C.
【Key words】 hydrothermal synthesis； LiFePO4； Ni-doping； lithium-ion batteries； anode materials；
- 【文献出处】 稀有金属材料与工程 ,Rare Metal Materials and Engineering , 编辑部邮箱 ,2007年01期
- 【分类号】TM912
- 【被引频次】35
- 【下载频次】574