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首页> 外文期刊>International Journal of Electrochemical Science >Mn and V co-doped Li2FeSiO4 Cathode Materials with Enhanced Electrochemical Properties
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Mn and V co-doped Li2FeSiO4 Cathode Materials with Enhanced Electrochemical Properties

机译：Mn和V共掺杂增强电化学性能的Li 2 FeSiO 4 阴极材料

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Co-substitution at Fe site has been shown to enhance electrochemical properties of Li 2 FeSiO 4 -basedcathode materials. Hence, Mn and V co-doped Li 2 Fe 0.8(1-x) Mn 0.2(1-x) V x SiO 4 (x=0, 1%, 2%, and 5%) wereprepared in this study through citrate-assisted sol-gel method. Effects of Mn and V co-substitution onstructures, morphologies, and electrochemical behaviors of obtained materials were investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM), charge-discharge testing, and ACimpedance measurements. The results indicated that specimens with doping content of x=1% displayedthe best initial discharge specific capacity of 134.5 mAh/g at 0.1 C rate with retention capacity over 80%after 100 cycles. These improvements were linked to several factors, including lamellar-like particlemorphology, electrochemical activity of V-ion, high Li-ion diffusion coefficient, and large exchangecurrent.
机译：已显示在Fe位点的共取代增强了Li 2 FeSiO 4基阴极材料的电化学性能。因此，在这项研究中，通过柠檬酸盐制备了Mn和V共掺杂的Li 2 Fe 0.8（1-x）Mn 0.2（1-x）V x SiO 4（x = 0、1％，2％和5％）。辅助溶胶凝胶法。通过X射线衍射（XRD），扫描电子显微镜（SEM），充放电测试和交流阻抗测量研究了Mn和V共取代对所得材料的结构，形态和电化学行为的影响。结果表明，掺杂含量为x = 1％的样品在0.1 C速率下表现出最佳的初始放电比容量134.5 mAh / g，经过100次循环后保留容量超过80％。这些改进与多种因素有关，包括层状颗粒形态，V离子的电化学活性，高Li离子扩散系数和大交换电流。

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