锂离子电池用高性能五氧化二钒

High Performance Vanadium Pentoxide for Lithium Battery

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222.7 mA.h/g,效率维持在98%;在电压为2.0～4.0 V的范围内,经过40次循环,其放电比容量仍然维持在215.2 mA.h/g。

Vanadium oxides were fabricated by a surfactant-assisted hydrothermal route at 180 ℃.Vanadium pentoxides were pre-pared by calcining the precursor VO2.The samples were characterized by X-ray diffraction,scanning electron microscope and infra-red spectroscope.The V2O5 with rectangle nanorods as the cathode material,was tested its charge/discharge performance.The results show V2O5 has uniform rectangle nanorods structure with micro-nano size beneficial to keep stable structure and good charge/discharge performance.The V2O5 nanorods exhibited a high initial discharge capacity of 222.7 mA·h/g,high energy efficiency（98%） and 215.2 mA·h/g capacity was kept after 40 cycles in the potential region 2.0-4.0 V.