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首页> 外文期刊>Chemistry: A European journal >A Feasibility Study on the Use of Li4V3O8 as a High Capacity Cathode Material for Lithium-Ion Batteries
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A Feasibility Study on the Use of Li4V3O8 as a High Capacity Cathode Material for Lithium-Ion Batteries

机译：Li4V3O8用作锂离子电池大容量正极材料的可行性研究

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摘要

Li4V3O8 materials have been prepared by chemical lithiation by Li2S of spherical Li1.1V3O8 precursor materials obtained by a spray-drying technique. The over-lithiated vanadates were characterised physically by using scanning electron microscopy (SEM) and X-ray diffraction (XRD), and electrochemically using galvanostatic charge-discharge and cyclic voltammetry measurements in both the half-cell (vs. Li metal) and full-cell (vs. graphite) systems. The Li4V3O8 materials are stable in air for up to 5 h, with almost no capacity drop for the samples stored under air. However, prolonged exposure to air will severely change the composition of the Li4V3O8 materials, resulting in both Li1.1V3O8 and Li2CO3. The electrochemical performance of these over-lithiated vanadates was found to be very sensitive to the conductive additive (carbon black) content in the cathode. When sufficient carbon black is added, the Li4V3O8 cathode exhibits good cycling behaviour and excellent rate capabilities, matching those of the Li1.1V3O8 precursor material, that is, retaining an average charge capacity of 205 mAhg(-1) at 2800 mAg(-1) (8C rate; 1C rate means full charge or discharge of a battery in one hour), when cycled in the potential range of 2.0-4.0 V versus Li metal. When applied in a non-optimised full cell system (vs. graphite), the Li4V3O8 cathode showed promising cycling behaviour, retaining a charge capacity (Li+ extraction) above 130 mAhg(-1) beyond 50 cycles, when cycled in the voltage range of 1.6-4.0 V, at a specific current of 117 mAg(-1) (C/3 rate).
机译：通过用喷雾干燥技术获得的球形Li1.1V3O8前体材料的Li2S化学锂化来制备Li4V3O8材料。通过使用扫描电子显微镜（SEM）和X射线衍射（XRD）在物理上表征过锂化的钒酸盐，并在半电池（相对于Li金属）和全电池中，使用恒电流充放电和循环伏安法对电化学进行了表征。电池（相对于石墨）系统。 Li4V3O8材料在空气中最多可稳定5 h，而在空气中存储的样品几乎没有容量下降。但是，长时间暴露在空气中会严重改变Li4V3O8材料的成分，从而导致Li1.1V3O8和Li2CO3两者。发现这些过锂化的钒酸盐的电化学性能对阴极中的导电添加剂（炭黑）含量非常敏感。当添加足够的炭黑时，Li4V3O8阴极表现出良好的循环行为和出色的倍率性能，与Li1.1V3O8前体材料相匹配，也就是说，在2800 mAg（-1）时保持205 mAhg（-1）的平均充电容量。 ）（8C速率; 1C速率表示电池在1个小时内充满电或放电），在相对于Li金属的2.0-4.0 V电位范围内循环。当用于非优化的全电池系统（相对于石墨）中时，Li4V3O8阴极显示出有希望的循环性能，在50V的电压范围内循环时，在超过50个循环后仍保持130 mAhg（-1）以上的充电容量（Li +提取）。在117 mAg（-1）（C / 3速率）的特定电流下为1.6-4.0 V.

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