Abstract
LiFePO4 cathode material is considered as prospective materials for lithium-ion batteries and attracted great interest because of excellent cyclic performance and environmentally friendliness. However, LiFePO4 material suffers from inferior electronic and Li+ conductivity, which restricts its performance at high rate. Improving the interfacial stability and the interfacial charge transfer of the electrode is a necessary method to enhance the cycle and rate capability. Herein, vanadium oxide decoration on LiFePO4/C composites was obtained via a simple wet chemical method. The results show that a moderate amount of vanadium oxide hybrid stabilizes the structure of the matrix LiFePO4 material. Vanadium oxide and the residual carbon coating construct a mixed conductive network, which optimizes the interface structure and reaction dynamics of the electrode. In addition, the charge transfer resistance of the decorated hybrid is smaller and the Li+ diffusion ability is better than pristine LiFePO4/C material. Moreover, the electrochemical performance exhibits a promising high rate capability and perfect cycle ability, showing the discharge specific capacities of 157.2, 150.6, and 131.1 mAh g−1 at 0.1 C, 1 C, and 3 C respectively. Furthermore, the capacity retention reached 90.9% after the 1000th cycle at 3 C.
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This study was supported by the Nature Science Foundation of China (Grant No. 51602352, 51774343).
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Tao, Y., Cao, Y., Hu, G. et al. Effects of vanadium oxide coating on the performance of LiFePO4/C cathode for lithium-ion batteries. J Solid State Electrochem 23, 2243–2250 (2019). https://doi.org/10.1007/s10008-019-04319-0
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DOI: https://doi.org/10.1007/s10008-019-04319-0