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| Nd3+掺杂对LiFePO4结构及电化学性能的改善 | |
| 引用本文： | 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. |
| 作者姓名： | 张 丽 赵敏寿 王丹丹 沙 鸥 邓瑞平 孟 健 |
| 作者单位： | 1. 燕山大学环境与化学工程学院,秦皇岛,066004 2. 燕山大学环境与化学工程学院,秦皇岛,066004;中国科学院长春应用化学研究所稀土资源利用国家重点实验室,长春,130022 3. 中国科学院长春应用化学研究所稀土资源利用国家重点实验室,长春,130022 |
| 基金项目： | 国家自然科学基金资助项目 |
| 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16h时,样品在0.2C(1C=170.0mA·g-1)电流密度下的最大放电比容量可达165.2mAh·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 Nd3+掺杂 电化学性能 实测理论比容量 |
Effect of Nd3+ doping on Structure and Electrochemical Performance of LiFePO4 |
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| ZHANG Li,ZHAO Min-Shou,WANG Dan-Dan,SHA Ou,DENG Rui-Ping and MENG Jian.Effect of Nd3+ doping on Structure and Electrochemical Performance of LiFePO4[J].Chinese Journal of Inorganic Chemistry,2009,25(10):1724-1728. | |
| Authors: | ZHANG Li ZHAO Min-Shou WANG Dan-Dan SHA Ou DENG Rui-Ping and MENG Jian |
| Institution: | College of Environmental and Chemical Engineering, Yanshan University, Qinhuangdao, Hebei 066004,College of Environmental and Chemical Engineering, Yanshan University, Qinhuangdao, Hebei 066004; State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022,College of Environmental and Chemical Engineering, Yanshan University, Qinhuangdao, Hebei 066004,College of Environmental and Chemical Engineering, Yanshan University, Qinhuangdao, Hebei 066004,State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022 and State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022 |
| Abstract: | LiFe_(1-x)Nd_xPO_4(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 Fe~(3+) in LiFe_(1-x)Nd_xPO_4/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 LiFe_(1-x)Nd_xPO_4/C sample has the same olivine structure as LiFePO_4. When the dopant of Nd~(3+) 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: | LiFePO4 |
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