不同合成方法对LiNi_(1/3)Co_(1/3)Mn_(1/3)O_2材料电化学性能的影响  

Influence of synthesis methods on the electrochemical performance of LiNi_(1/3)Co_(1/3)Mn_(1/3)O_2

作　　者：成雪莲[1] 王瑾[1] 王子港[1] 杨朗[1] 杨晖[1] 

机构地区：[1]南京工业大学材料科学与工程学院,江苏南京210009

出　　处：《功能材料》2010年第10期1792-1795,共4页Journal of Functional Materials

基　　金：国家自然科学基金资助项目(20803035);江苏省自然科学基金资助项目(BK200718)

摘　　要：通过固相自引发基团置换反应,流变相法和固相自引发基团置换-流变相法3种方法成功制备出LiNi1/3Co1/3Mn1/3O2材料。XRD、SEM和电化学测试表明,固-流法制备的样品具有最稳定的二维层状结构和最小的阳离子混排度及最佳的微观形貌和电化学性能。在2.8～4.3V区间内0.2、0.5、1和2C下的放电比容量分别为185.9、169.9、157.5和134.7mAh/g。0.5C下的循环测试表明,20次循环后电极的放电比容量为143.9mAh/g,容量保持率为84.7%。提高充电截止电压到4.6V,能极大地提高材料的充放电比容量,首次放电比容量为197mAh/g,同时,不可逆容量增大。Layer-structured LiNi1/3Co1/3Mn1/3O2 cathode materials were prepared successfully by self-propagating solid-state metathesis,rheological phase method and self-propagating solid-state metathesis-rheological phase method.LiNi1/3Co1/3Mn1/3O2 materials were studied by SEM,XRD and electrochemical test.The results indicate that the sample synthesized by self-propagating solid-state metathesis-rheological phase method has the best two-dimensional layered structure,cationic degree of order and uniform particle distribution.The initial specific discharge capacity is 185.9,169.9,157.5 and 134.7m Ah/g at 0.2,0.5,1,2 Crespectively,showing favorable rate electrochemical performance.The cycle test at 0.5Cshows discharge capacity retention rate is 84.7% after 20 cycles.Increasing charge cut-off voltage could improve the previous discharge capacity,and the initial discharge capacity is 197mAh/g in the voltage range of 2.8-4.6V,while the irreversible capacity presents increasing.

关 键 词：固相反应-流变相法 LINI1/3CO1/3MN1/3O2 倍率性能 容量保持率 

分 类 号：TM912.9[电气工程—电力电子与电力传动]