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首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >Synthesis and rate performance of lithium vanadium phosphate as cathode material for Li-ion batteries
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Synthesis and rate performance of lithium vanadium phosphate as cathode material for Li-ion batteries

机译：锂离子电池正极材料磷酸钒锂的合成及倍率性能

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摘要

A sphere-like carbon-coated Li_3V_2(PO_4)_3 composite was synthesized by carbothermal reduction method with two sessions of ball milling followed by spray-drying with the dispersant of polyethylene glycol added. The structure, particle size, and surface morphology of the cathode material were investigated via X-ray diffraction, scanning electron microscopy, and high-resolution transmission electron microscopy. Results indicate that the Li_3V_2(PO_4)_3/C composite has a sphere-like morphology composed of a large number of carbon-coated ultrafine particles linked together with a monoclinic structure. In the voltage range of 3.0-4.3 V, it exhibits the discharge capacities of 130 mAhg~(-1) and 100mAhg~(-1) at 0.2 C and 20 C rates, respectively. This behavior indicates that the obtained Li_3V_2(PO_4)_3/C material has excellent rate capability.
机译：通过碳热还原法，经两次球磨，然后喷雾干燥并加入聚乙二醇分散剂，合成了球形碳包覆的Li_3V_2（PO_4）_3复合材料。通过X射线衍射，扫描电子显微镜和高分辨率透射电子显微镜研究了正极材料的结构，粒径和表面形态。结果表明，Li_3V_2（PO_4）_3 / C复合材料具有球状形态，由大量碳包覆的超细颗粒与单斜晶结构连接在一起。在3.0-4.3 V的电压范围内，它在0.2 C和20 C速率下的放电容量分别为130 mAhg〜（-1）和100mAhg〜（-1）。该行为表明，所获得的Li_3V_2（PO_4）_3 / C材料具有优异的倍率能力。

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