摘要
采用低温液相碳酸盐法合成了掺杂钒的Li Mn O正极材料。X射线衍射分析表明当掺钒量小于 2 0 % ,合成的电极材料Li V Mn O仍能保持LiMn2 O4 的尖晶石结构 ,当掺钒量超过 2 0 %则合成产物中不含尖晶石结构的LiMn2 O4 。循环伏安和恒电流充放电实验证实掺杂钒可改善Li Mn O正极材料电化学反应的可逆性 ,并提高其比容量 ;掺钒量大于10 %时 。
The cathode material Li Mn O with vanadium doping for lithium ion battery was prepared by low temperature liquid phase carbonate method.X ray diffraction analysis indicates that the prepared cathode material Li V Mn O still maintains the structure of spinel LiMn 2O 4 when the content of vanadium doping is less than 20%. However, when the addition amount of vanadium in the reactant is more than 20%, there is no spinel LiMn 2O 4 in the product. The results of cyclic voltammetry and constant current charge/discharge experiments show that vanadium doping improves the reversibility of the Li Mn O cathode material and increases its specific capacity. The production of impure phase in the product cause the electrochemical performance of the prepared material fade when the content of vanadium doping is more than 10%.
出处
《电源技术》
CAS
CSCD
北大核心
2001年第4期262-263,274,共3页
Chinese Journal of Power Sources
基金
重庆大学学科建设基金资助项目 (无编号 )
