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锂离子电池用高性能五氧化二钒

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Abstract:

在180℃水热条件下制备了钒氧化物,再通过煅烧前驱物VO2制备了微纳结构的五氧化二钒正极材料。通过X射线衍射、扫描电子显微镜、红外光谱等对样品的形貌、组成等进行表征。以合成的长方柱状V2O5作为锂离子电池的正极材料,测试了其充放电性能。结果表明合成的V2O5为均匀的长方柱状结构,尺寸介于微米、纳米尺寸之间,对材料的结构和充放电循环稳定性起到重要作用;电极的初始放电比容量为222.7mA·h/g,效率维持在98%;在电压为2.0~4.0V的范围内,经过40次循环,其放电比容量仍然维持在215.2mA·h/g。

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