【摘要】 锂钒氧化物Li1+δV3O8具有比容量高、循环寿命长、价格低等优点,因此它是一种非常有应用前景的锂离子蓄电池正极材料。作者采用传统的高温固相反应法合成了Ti、Fe、Ni、Co4种过渡金属元素部分取代Li1+δV3O8中钒的掺杂产物Li1+δMxV3-xO8,研究了不同掺杂元素及其掺杂量对材料电化学性能的影响。结果表明,掺杂Ti元素且掺杂量x≤0.1时,掺杂对材料的性能有一定的改善。掺杂没有提高其放电电压平台,降低了其比容量。但掺杂对其循环性能没有明显影响。综合考虑电化学性能,掺杂少量Ti比较适宜。更多还原

【Abstract】 Li_1+δV₃O₈ has the advantages of high specific capacity, long cycling life and low price, so it will become a very promising cathode material for lithium-ion batteries in the future. In this paper, Ti、Fe、Ni、Co doped lithium vanadium oxide materials Li_1+δM_xV_3-xO₈ were synthesized by traditional high-temperature solid state reaction. The effects of doping elements and doping amount into Li_1+δV₃O₈ on its electrochemical properties were studied. The results show that the Ti doped Li_1+δV₃O₈ cathode material has better performance than Li_1+δV₃O₈ itself. Doping Ti、Fe、Ni and Co does not increase the voltage plateau of discharge and influences the cyclic property, but decreases the specific capacity. According to the comprehensive consideration of electrochemical properties, doping a little of Ti element （x≤0.1） is feasible and profitable.更多还原