| 金属氧化物掺杂改善LiFePO4电化学性能 |
| Improvement of LiFePO4 Electrochemical Performance by Doping Metal Oxides |
|
| 摘要: 采用氧化物前驱体对磷酸铁锂(LiFePO4)进行少量金属离子掺杂，并用XRD，SEM和恒电流充放电对掺杂的LiFePO4进行了研究。结果表明，少量的掺杂离子在很大程度上提高了LiFePO4的电化学性能，特别是大电流放电性能。1.0 mol%的Nb5+掺杂LiFePO4的0.1 C放电容量约150 mAh·g-1；即使在3 C倍率下放电，也有117 mAh·g-1的容量。掺杂的效果与掺杂离子的半径、价态密切相关，半径小、价态高的离子对提高LiFePO4的电化学性能有利。在掺杂量较小时(<2.0 mol%)，掺杂效果与掺杂离子的浓度关系不大。 |
| 关键词: 磷酸铁锂 金属氧化物 离子掺杂 电化学性能 |
| 基金项目: |
| Abstract: Lithium iron phosphate (LiFePO4) containing low concentration ion dopants was prepared by mixing precursors with metal oxides. The LiFePO4 samples were characterized by X-ray diffraction, scanning electron microscope, and electrochemical charge and discharge tests. The results indicate that the ion dopants do not affect the structure of the material but considerably improve its electrochemical performance, especially large current discharge behaviors. LiFePO4 samples doped with Nb5+ have an initiate capacity of 150 mAh·g-1 at 0.1 C, and they are capable of delivering reversible specific capacities of 117 mAh·g-1 even at a 3 C discharge rate. The results also verify that LiFePO4 doped with ions of smaller radius and higher valence shows better electrochemical characters. However, the amount of dopant has little impact on the electrochemical performance of LiFePO4 within low concentration (<2.0 mol%). |
| Keywords: lithium iron phosphate metal oxide ion doping electrochemical performance |
| 投稿时间：2004-08-10 修订日期：2004-10-30 |
| 摘要点击次数: 1373 |
| 全文下载次数: 1860 |
| 倪江锋,周恒辉,陈继涛,张新祥.金属氧化物掺杂改善LiFePO4电化学性能[J].无机化学学报,2005,21(4):472-476. |
| 查看全文 查看/发表评论 下载PDF阅读器 |
| Support information: |
|
|
|
|
|
|
