摘要
以Li_2CO_3和NH_4VO_3为原料,采用非熔融态的固相反应法合成了锂离子电池正极材料锂钒氧化物.通过TG-DTA,XRD分析确定了合成反应的主要历程.XRD测试表明,580℃焙烧10h获得的产物为单一相层状结构,晶型发育良好.循环伏安测试表明,Li^+在材料中嵌入脱出的机理不同,嵌入是分步进行的.恒电流充放电测试表明,锂钒氧化物的初始容量为252.9mAh.g-1,55次循环后容量保持率高达97.07%,循环性能优良.交流阻抗测试表明,材料具有较高的离子电导率,有利于提高其电化学性能.
Lithium vanadium oxide, as cathode material for Li-ion battery, was synthesized by non-molten solid-state reaction with LizCO3 and NH4VO3 as raw materials. The main reaction mechanism was determined by TG-DTA and XRD tests. XRD results indicate that material calcined at 580 ℃ for 10 h has well-developed layered structure. Cyclic voltarnmogram tests indicate that insertion and extraction mechanisms of Li^＋ in Li1＋x V3O8 are different, insertion proceeds step by step. Galvanostatic charge-discharge tests show that the initial discharge capacity and capacity retention after 55 cycles are 252.9 mAh·g^-1 and 97.07 %, respectively. AC analysis shows that the material has higher ion conductivity which is good for better electrochemical performance.
出处
《东北大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2006年第10期1130-1133,共4页
Journal of Northeastern University(Natural Science)
基金
辽宁省科技厅资助项目(2003224005).
