| 铬掺杂的锂离子电池正极材料LiVPO4F的制备以及电化学行为的研究 |
| Preparation of Cr-doped LiVPO4F and Electrochemical Studies on Li Extraction/Insertion Performances for Lithium-ion Batteries |
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| 摘要: 采用高温固相法2步合成了掺Cr的锂离子电池正极材料LiV1-xCrxPO4F(x=0，0.01，0.03，0.05，0.07)，XRD测试表明LiV1-xCrxPO4F属三斜晶系。通过恒电流充放电，循环伏安和交流阻抗实验表明：掺Cr后LiVPO4F正极材料更有利于锂离子的嵌入和嵌出，材料的放电容量和循环性能进一步提高，例如，铬掺杂的LiVPO4F样品在室温、0.2 C倍率下充放电，循环50周后容量在110 mAh·g-1以上。文中还讨论了充放电容量随掺Cr量的关系，nCr含量为0.03的LiV1-xCrxPO4F有着较高的放电平台和良好的循环稳定性。 |
| 关键词: 锂离子电池 LiVPO4F 铬掺杂 循环伏安(CV) |
| 基金项目: |
| Abstract: A series of Cr-doped LiVPO4F cathode materials were synthesized by conventional solid-state reactions of the stoichiometric mixture of
VPO4, CrPO4 and LiF, and the samples showed the same triclinic structure as the undoped
LiVPO4F. The Cr-doped LiVPO4F samples were investigated on the Li extraction/insertion performances through galvanostatic charge/discharge, cyclic voltammetry (CV), and electrochemical impedance spectrum (EIS). The Cr-doped
LiVPO4F systems showed improved capacity and cyclability in the voltage range of 3.0~4.6 V at different rates, for example, the measured discharge capacity of the Cr-doped
LiVPO4F sample was still held over 110 mAh·g-1 after 50 cycles at 0.2 C rate at room temperature. The optimal doping content of Cr was that x=0.03 in the
LiV1-xCrxPO4F samples to achieve high discharge capacity and good cyclic stability. The electrode reaction reversibility was enhanced, and the charge transfer resistance was decreased through the Cr-doping. The improved electrochemical performances of the Cr-doped
LiVPO4F cathode materials are attributed to the structural stability derived from the incorporation of
Cr3+ ions. |
| Keywords: lithium-ion batteries LiVPO4F Cr-doping cyclic voltammetry (CV) |
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| 李宇展,周震,任俊霞,高学平,阎杰.铬掺杂的锂离子电池正极材料LiVPO4F的制备以及电化学行为的研究[J].无机化学学报,2006,22(3):477-482. |
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