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首页> 外文期刊>International Journal of Electrochemical Science >Synthesis and Electrochemical Properties of Na and Mg co- Doped LiFe0.65Mn0.35PO4 /C Cathode Materials for Lithium-Ion Batteries
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Synthesis and Electrochemical Properties of Na and Mg co- Doped LiFe0.65Mn0.35PO4 /C Cathode Materials for Lithium-Ion Batteries

机译：Na，Mg共掺杂锂离子电池LiFe 0.65 Mn 0.35 PO 4 / C正极材料的合成及电化学性能

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摘要

In this paper, Li(Fe 0.65 Mn 0.35 ) 0.98 Mg 0.02 PO 4 /C, Li 0.98 Na 0.02 Fe 0.65 Mn 0.35 PO 4 /C andLi 0.98 Na 0.02 (Fe 0.65 Mn 0.35 ) 1-x Mg x PO 4 /C (x = 0.01, 0.02, 0.03, 0.05) were successfuly synthesized by sol-gel method and modified by Na + doped and Mg 2+ doped. The effects of Na + and Mg 2+ doping on thestructure, morphology and electrochemical performance of LiFe 0.65 Mn 0.35 PO 4 /C were investigated byX-ray diffraction (XRD), scanning electron microscopy (SEM), Energy Dispersive Spectroscopy (EDS),and electrochemical tests. The results show that when x=0.03, the material has the best electrochemicalperformance. The first discharge capacity at 0.1 C is as high as 147.7 mAhg -1 (1 C=170.2 mAhg -1 ) at thepotential range of 2.5–4.5 V, When returning to 0.1 C after 40 cycles, the discharge specific capacity isstill up to 142.1 mAhg -1 . In addition, the Rct values and the Li + diffusion coefficient of Na0.02Mg0.03were 215.2 Ω, 4.501×10 -14 cm 2 s -1 , respectively.
机译：本文中，Li（Fe 0.65 Mn 0.35）0.98 Mg 0.02 PO 4 / C，Li 0.98 Na 0.02 Fe 0.65 Mn 0.35 PO 4 / C和Li 0.98 Na 0.02（Fe 0.65 Mn 0.35）1-x Mg x PO 4 / C （x = 0.01，0.02，0.03，0.05）通过溶胶-凝胶法成功合成，并经Na +掺杂和Mg 2+掺杂改性。通过X射线衍射（XRD），扫描电镜（SEM），能谱分析（EDS）研究了Na +和Mg 2+掺杂对LiFe 0.65 Mn 0.35 PO 4 / C的结构，形貌和电化学性能的影响，和电化学测试。结果表明，当x = 0.03时，该材料具有最佳的电化学性能。在0.1 C时的首次放电容量在2.5–4.5 V的电位范围内高达147.7 mAhg -1（1 C = 170.2 mAhg -1）。40个循环后恢复至0.1 C时，放电比容量仍高达142.1 mAhg -1。另外，Na0.02Mg0.03的Rct值和Li +扩散系数分别为215.2Ω，4.501×10 -14 cm 2 s -1。

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