| 钽离子掺杂对LiFePO4 / C物理和电化学性能的影响 | |
| Effects of Ta Ion Doping on the Physical and Electrochemical Performance of LiFePO4/C | |
| 摘要: 采用PAM(聚丙烯酰胺)模板-溶胶凝胶法在惰性气氛下合成钽掺杂的LiFePO4/C复合正极材料，考察了钽对目标化合物的物理和电化学性能的影响。研究结果表明，0.33C的电流下充放电时，掺杂前后第2个循环的放电容量分别为138.6 mAh·g-1和155.5 mAh·g-1，循环20次后容量为141 mAh·g-1和156 mAh·g-1。电化学交流阻抗表明，掺杂后的材料阻抗Rct从180 Ω减小到120 Ω。振实密度比掺杂前提高0.312 g·cm-3。 | |
| 关键词: 掺杂 LiFePO4/C 正极材料 模板-溶胶凝胶法 | |
| 基金项目: | |
| Abstract: Ta-doped LiFePO4/C cathode material was synthesized through a Polyacrylamide (PAM) template-sol-gel reaction in an inert atmosphere. Effects of Ta5+ doping on the physical and electrochemical performances of the cathode materials were investigated. At 0.33C discharge rate, the secondly reversible specific capacity of the Ta-doped LiFePO4/C is nearly 17 mAh·g-1 higher than that of the undoped one. After 20 cycles, the capacity of the former is 156 mAh·g-1, 15 mAh·g-1 higher than that of the latter. Impedance Rct of the Ta-doped material is 120 Ω, while that of the undoped material is 180 Ω. The tap density of Ta-doped material was improved by 0.312 g·cm-3 compared with undoped one. | |
| Keywords: doping LiFePO4/C cathode material template-sol-gel reaction | |
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| 杨书廷,刘玉霞,尹艳红,王辉,王涛.钽离子掺杂对LiFePO4 / C物理和电化学性能的影响[J].无机化学学报,2007,23(7):1165-1168. | |
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