| Nd3+掺杂对LiFePO4结构及电化学性能的改善 | |
| Effect of Nd3+ doping on Structure and Electrochemical Performance of LiFePO4 | |
| 摘要: 采用两步加热高温固相法合成了掺杂Nd3+的LiFe1-xNdxPO4/C复合材料(x=0，0.01，0.02，0.04，0.06，0.08)。用TG-DSC对前驱体进行分析和SQUID(超导量子干涉仪)对样品中Fe3+的磁性测定，优化了合成工艺条件；采用XRD、FE-SEM、EDS等方法分析了样品的结构并对其电化学性能进行了测试。结果表明：LiFe1-xNdxPO4/C复合材料具有橄榄石型结构；当Nd3+的掺杂量6%(物质的量分数)、煅烧温度700 ℃、煅烧时间16 h时，样品在0.2C(1C=170.0 mA·g-1)电流密度下的最大放电比容量可达165.2 mAh·g-1，循环100次后的容量保持率仍为92.8%，在1C、2C、5C下的最大放电比容量分别为146.8、125.7和114.8 mAh·g-1。通过测定样品在不同较低倍率下的放电比容量，采用外推法得出制备样品的实测理论比容量为168.7 mAh·g-1。 | |
| 关键词: 锂离子电池 LiFePO4 Nd3+掺杂 电化学性能 实测理论比容量 | |
| 基金项目: | |
| Abstract: LiFe1-xNdxPO4(x=0, 0.01, 0.02, 0.04, 0.06, 0.08) cathode material for Li-ion battery was synthesized by two-step heating solid-state reaction. The synthesis conditions were optimized through the thermal analysis of the precursor by TG-DSC and the magnetic measurement of Fe3+ in LiFe1-xNdxPO4/C sample by SQUID(Superconducting QUantum Interference Device). The structure and electrochemical performance of the material were studied by XRD, FE-SEM, EDS and galvanostatic charge-discharge method. The results show that LiFe1-xNdxPO4/C sample has the same olivine structure as LiFePO4. When the dopant of Nd3+ is 6%(molar fraction) and precursor is calcined for 16 h at 700 ℃, the sample delivers the highest discharge capacity of 165.2 mAh·g-1 at 0.2C(1C=170.0 mA·g-1) rate, and the capacity retention rate is 92.8% after 100 cycles, and 146.8 mAh·g-1, 125.7 mAh·g-1, 114.8 mAh·g-1 at 1, 2, 5 C-rates, respectively. The measured theoretical capacity is about 168.7 mAh·g-1 by measuring the capacity at various discharge current density and extrapolating to the current density of zero. | |
| Keywords: lithium-ion battery LiFePO4 Nd3+-doped electrochemical performance measured theoretical capacity | |
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| 张 丽,赵敏寿,王丹丹,沙 鸥,邓瑞平,孟 健.Nd3+掺杂对LiFePO4结构及电化学性能的改善[J].无机化学学报,2009,25(10):1724-1728. | |
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