LiNi_(1/3)Co_(1/3)Mn_(1/3)O_2正极材料的合成及电化学性能研究  

Synthesis and electrochemical performance study of LiNi_(1/3)Co_(1/3)Mn_(1/3)O_2 cathode material

作　　者：成雪莲[1] 王瑾[1] 王子港[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5期851-854,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——流变相法制备出层状LiNi1/3Co1/3Mn1/3O2正极材料,研究了不同烧结温度对材料的结构特性、微观形貌以及电化学性能的影响。结果表明,850℃煅烧20h的样品具有最佳的二维层状结构和阳离子有序度,产物颗粒呈球形,分布均匀,平均粒径约250nm。在2.8～4.3V区间,以80mA/g充放电,首次放电比容量为169mAh/g,30次循环后容量保持率为82.6%。将充电截止电压提高至4.4V,材料的前几次放电容量明显提高,以32mA/g充放电,10次循环后的放电比容量为174mAh/g,其后容量衰减加快,循环稳定性变差。Layer-structured LiNi1/3Co1/3Mn1/3O2 cathode material was prepared by self-propagating solid-state metathesis-rheological phase method. LiNi1/3Co1/3Mn1/3O2 materials prepared at different sintering temperatures were studied by SEM,XRD and electrochemical test. The result indicates the sample sintered at 850℃,20h has the best two-dimensional layered structure and cationic degree of order. The particle size is 250nm and its distribution is uniform. The initial specific discharge capacity of 169mAh/g is obtained between 2.8-4.3V,at 80mAh/g,and discharge capacity retention rate is 82.6% after 30 cycles. Increasing charge cut-off voltage could improve the previous discharge capacities.The discharge capacity cycled at 32mAh/g is 174mAh/g after 10 cycles in the voltage range of 2.8-4.4V,but after that ,the capacities decay quickly and capacity retention becomes poor.

关 键 词：LINI1/3CO1/3MN1/3O2 固相自引发基团反应———流变相法 容量保持率 截止电压 

分 类 号：TM912.9[电气工程—电力电子与电力传动]