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Effects of Cr doping on the electrochemical performance of Li3V2(PO4)3 cathode material for lithium ion batteries |
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| Authors: | Yang S. Y. Zhang S. Fu B. L. Wu Q. Liu F. L. Deng C. |
| Affiliation: | 1.College of Material Science and Chemical Engineering, Harbin Engineering University, Harbin, 150001, Heilongjiang, China ;2.College of Chemistry and Chemical Engineering, Provincial Key Lab for Nano-functionalized Materials and Excitated States, Harbin Normal University, Harbin, 150025, Heilongjiang, China ; |
| Abstract: | A series of Cr-doped Li3V2 − x Cr x (PO4)3 (x = 0, 0.1, 0.25, and 0.5) samples are prepared by a sol–gel method. The effects of Cr doping on the physical and chemical characteristics of Li3V2(PO4)3 are investigated. Compared with the XRD pattern of the undoped sample, the XRD patterns of the Cr-doped samples have no extra reflections, which indicates that Cr enters the structure of Li3V2(PO4)3. As indicated by the charge–discharge measurements, the Cr-doped Li3V2 − x Cr x (PO4)3 (x = 0.1, 0.25, and 0.5) samples exhibit lower initial capacities than the undoped sample at the 0.2 C rate. However, both the discharge capacity and cycling performance at high rates (e.g., 1 and 2 C) are enhanced with proper amount of Cr doping (x = 0.1). The highest discharge capacity and capacity retention at the rates of 1 and 2 C are obtained for Li3V1.9Cr0.1(PO4)3. The improvement of the electrochemical performance can be attributed to the higher crystal stability and smaller particle size induced by Cr doping. |
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