Li_(1+x)V_(3-y)MyO_8(M=Mo,P)高温阴极放电性能的研究

Study on Cathodical Discharge Behaviors of Li_(1+x)V_(3-y)MyO_8 (M=Mo, P) at Elevated Temperature

采用固相反应法制备了Li1+xV3-yMyO8(M=Mo,P;0≤y≤0.4),研究了不同Mo和P含量对Li1+xV3O8相的影响,并首次对其进行了高温阴极放电性能的研究。结果表明:Mo和P掺杂量分别为y≤0.2和y<0.2时可获得纯Li1+xV3O8相;Mo掺杂使Li1+xV3O8峰值电压提高0.3V,比容量提高25%,嵌入的Li+量最高可达x=3.8;P掺杂(y≤0.20)对Li1+xV3O8的峰值电压和比容量影响较小。化学嵌锂实验也证实掺杂后的材料具有更快的Li+嵌入速度。

The powder of Li1＋xV3-yMyO8（M=Mo, P; 0≤y≤0.4） was synthesized by solid state reaction and the discharge performances at 500℃and 550℃ were measured. Powder X-ray diffraction （XRD） using Cu Kα radiation was used to identify the influence of doping contents on Li1＋xV3-yMyO8 phase. The results show the pure Li1＋xV3-yMyO8 phase is obtained when the utmost limits of doping contents of Mo and P are y≤0.2 and y〈0.2, respectively. The results of discharge performances show the discharge voltage increases about 0.3V and specific capacity also Li1＋xV3-yMyO8 do of chemical I increases about 25% because of the doping of Mo, and the maximum lithium content was x=3.8 at 550℃. The influences of ping ithiat with P （y≤0.20） on the maximum discharge voltage and ion also proves the lithiated speed of doping materials is specific capacity at high temperature are little. The experiment quicker.