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Citation: Ni Jiang-Feng, Zhou Heng-Hui, Chen Ji-Tao, Su Guang-Yao. Effect on the Electrochemical Performance of Lithium Iron Phosphate by Cr^3＋ Ion Doping[J]. Acta Physico-Chimica Sinica, ;2004, 20(06): 582-586. doi: 10.3866/PKU.WHXB20040606 shu

Effect on the Electrochemical Performance of Lithium Iron Phosphate by Cr^3＋ Ion Doping

1.
College of Chemistry and Molecular Engineering, Peking University, Beijing　100871;College of Chemistry, Xiangtan University, Xiangtan　411105

Received Date: 10 December 2003
Available Online: 15 June 2004

Two different methods(mechanical ball-milling and co-precipitation)were applied to prepare lithium iron phosphate(LiFePO4) containing low concentration(1％, mole fraction) Cr3＋ ion dopant. The samples were characterized by X-ray diffraction and scanning electron microscope, and their electrochemical performances were investigated including cycling behavior and large current discharging. The results indicate that the Cr3＋ ion dopant does not affect the structure of the material but considerably improves its kinetics in terms of capacity delivery and cycle performance. At a low discharging rate (0.1 C), LiFePO4 samples doping via mechanical ball-milling and co-precipitation are capable of delivering reversible specific capacities of 144 mAh•g－1 and 158 mAh•g－1 respectively, with fairly stable cycleability. Even at a 2 C discharging rate, they can show capacities of 110 mAh•g－1 and 130 mAh•g－1 respectively, too. The results also confirm that doping via co-precipitation with Fe sources is an effective method to improve the ion doping effect.
- Lithium iron phosphate;Co-precipitation;Ion doping;Electronic conductivity;Lithium intercalation capacity;Positive electrode material
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沈阳化工大学材料科学与工程学院沈阳 110142

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Effect on the Electrochemical Performance of Lithium Iron Phosphate by Cr3＋ Ion Doping

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通讯作者: 陈斌, bchen63@163.com

Effect on the Electrochemical Performance of Lithium Iron Phosphate by Cr^3＋ Ion Doping