在没有涂敷粘结剂的条件下,采用电解和热处理相结合的两步法直接制得KV5O13-x-C正极.通过恒电流放电、X射线粉末衍射、红外光谱分析、差热-热重分析以及环境扫描电镜等方法,研究合成条件与放电性能的关系.结果表明,最佳的工艺参数是:在电解制备步骤中,电解液由浓度24 g/L的K2SO4和在40 ℃下饱和的NH4VO3溶液组成,石墨片阴极的电流密度为0.3 mA/cm2;在热处理步骤中,在流速30 mL/min的空气气氛中于300 ℃烧结.在此工艺条件下直接制备的KV5O13-x-C电极上的钒氧键较稳定,在0.1 C倍率电流下放电容量为238 Ma·h/g.
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