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首页> 外文期刊>International Journal of Electrochemical Science >Synthesis of Li3V2(PO4)3/C Composites as Cathode Materials for Lithium Ion Batteries via a Sol-Gel Method
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Synthesis of Li3V2(PO4)3/C Composites as Cathode Materials for Lithium Ion Batteries via a Sol-Gel Method

机译：Li 3 V 2 （PO 4 ） 3 / C复合材料作为锂离子电池正极材料的合成溶胶凝胶法

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Li3V2(PO4)3/C composite cathode materials were successfully synthesized via a sol-gel route based onLiOHH2O, V2O5, NH4H2PO4 and C6H8O7H2O (citric acid) as raw materials. Citric acid acts as achelating reagent and a carbon source during the synthesis process, which can improve theconductivity of the composite materials and hinder the growth of Li3V2(PO4)3 particles. The thermalstability, crystal structure and morphology of the as-prepared powders were characterized bythermogravimetric analysis (TG-DTG), X-ray diffraction (XRD), scanning electron microscope(SEM), and transmission electron microscope (TEM). The results indicate that the sinteringtemperatures have a remarkable effect on the crystal structure, morphology and particle size ofLi3V2(PO4)3/C composites. Demonstrated by XRD patterns, Li3V2(PO4)3/C composites have amonoclinic structure indexed to the P21 space group and well crystallized single phase calcined at800 . TEM images show Li3V2(PO4)3/C particles are roughly nanospheres in the diameter of about50 nm embedded in carbon networks. Electrochemical tests show that Li3V2(PO4)3/C compositesynthesized at 800 for 8 h displays the best electrochemical performances among theseLi3V2(PO4)3/C composites. Li3V2(PO4)3/C composite synthesized at 800 for 8 h shows that the discharge capacities in the first and 100th cycle are 169.65 and 131.72 mAh g , respectively, in the voltage of 3.0.8 V at the current rate of 30 mA g . When the current rate is raised to 120 mA g.
机译：以LiOHH2O，V2O5，NH4H2PO4和C6H8O7H2O（柠檬酸）为原料，通过溶胶-凝胶法成功合成了Li3V2（PO4）3 / C复合正极材料。柠檬酸在合成过程中作为螯合剂和碳源，可以提高复合材料的导电性，并阻碍Li3V2（PO4）3粒子的生长。通过热重分析（TG-DTG），X射线衍射（XRD），扫描电子显微镜（SEM）和透射电子显微镜（TEM）表征所制备粉末的热稳定性，晶体结构和形态。结果表明，烧结温度对Li3V2（PO4）3 / C复合材料的晶体结构，形貌和粒径有显着影响。通过X射线衍射（XRD）谱证实，Li3V2（PO4）3 / C复合材料具有单斜晶结构，索引到P21 / n空间群，并在800℃煅烧结晶良好。 TEM图像显示Li3V2（PO4）3 / C颗粒大致是直径约50 nm的纳米球，嵌入碳网络中。电化学测试表明，在800Li下合成8h的Li3V2（PO4）3 / C复合材料在这些Li3V2（PO4）3 / C复合材料中表现出最好的电化学性能。在800 h下合成8h的Li3V2（PO4）3 / C复合材料表明，在3.0.8 V的电压下，电流率为30 mA g时，第一个循环和第100个循环的放电容量分别为169.65和131.72 mAh g。 。当电流速率提高到120 mA g时。

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