Effect of Zinc Doping on Electrochemical Performance of Carbon Coated Lithium Vanadium Phosphate
Journal Title: 河南科技大学学报（自然科学版） - Year 2018, Vol 39, Issue 5
Abstract
Li2CO3, V2O5, NH4H2PO4 and ZnO were used as raw material, and glucose was used as carbon source and reductant.Li3V2-xZnx (PO4) 3/C (x = 0, 0.05, 0.10) were fabricated by high-temperature solid state method.By X-ray diffraction, scanning electron microscopy and high resolution transmission electron microscopy, the crystalline phases, structures and micro morphology of as-prepared samples were characterized and analyzed.By galvanostatic charge and discharge, cyclic voltammetry and electrochemical impedance spectroscopy, the electrochemical performance of samples were investigated.The results show that Zn2+ doping can not change the intrinsic structure of Li3 V2 (PO4) 3.Properly doping Zn2+ makes Li3V2 (PO4) 3 particles more uniform and structure more stable, resulting in greatly enhanced eletrochemical performances.When x is0.05, the initial discharge specific capacity is 123.1 m A·h·g-1.After charge and discharge for 20 cycles at0.5 C, the corresponding capacity retention rate still remains 99.76%.
Authors and Affiliations
Yong LIU, Fei WANG, Zhizhong WEI, Peng WANG, Fengzhang REN
Keywords
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