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中文摘要：
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、0．2C倍率下充放电，循环50周后容量在110mAh·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。
英文摘要：
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 vohammetry （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 Cr^3＋ ions.
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