LiNi_(0.4)Co_(0.2)Mn_(0.4)O_2与LiMn_2O_4共混正极材料电化学性能  

Electrochemical performances of the co-mixed LiNi_(0.4)Co_(0.2)Mn_(0.4)O_2 and LiMn_2O_4 as the positive-electrode material of lithium ion battery

作　　者：吕艳卓[1,2,3] 王霄鹤 刘建武 王振波[1] 柯克[1,3] 

机构地区：[1]哈尔滨工业大学化工与化学学院,哈尔滨150001 [2]哈尔滨工程大学材料科学与化学工程学院,哈尔滨150001 [3]超威电源有限公司,浙江长兴313100

出　　处：《哈尔滨工业大学学报》2016年第8期161-165,170,共6页Journal of Harbin Institute of Technology

基　　金：国家自然科学基金青年基金(21203040);中国博士后基金面上项目(2014M561357);浙江省博士后科研项目择优资助资金(zj140288);黑龙江省自然科学基金(B201201)

摘　　要：为开发具有优良循环性能和安全性能的大型锂离子电池的正极材料,将不同比例的LiNi_(0.4)Co_(0.2)Mn_(0.4)O_2和Li Mn2O4材料进行共混,研究了LiNi_(0.4)Co_(0.2)Mn_(0.4)O_2和Li Mn2O4共混以及共混比例(10∶0、8∶2、7∶3、6∶4、5∶5、0∶10)对锂离子电池的首次放电性能、循环性能和倍率性能以及交流阻抗和循环伏安曲线的影响,并采用扫描电镜对电极材料进行了表征.研究结果表明,共混比例会影响材料的电化学性能,8∶2,7∶3和6∶4配比的混合材料的体积比容量、循环性能和倍率性能要好于纯LiNi_(0.4)Co_(0.2)Mn_(0.4)O_2和Li Mn2O4材料.其中,8∶2配比的材料性能最好.In order to explore the positive material with excellent cycling ability and good safety, the effects of co-mixed ratios（10∶ 0、8∶ 2、7∶ 3、6∶ 4、5∶ 5、0∶ 10） of LiNi0.4Co0.2Mn0.4O2with LiMn2O4as the positive material of lithium ion battery on the first discharging properties, cycling abilities, rate capabilities, impedance spectroscopy and cyclic voltammetry were investigated. The co-mixed electrode materials were also characterized by SEM. The results indicated that the co-mixed ratio affected the electrochemical performances of the co-mixed materials. The materials with the ratios of 8∶ 2,7∶ 3 and 6∶ 4 showed higher specific volumetric capacity, better cyclic and rate performances than that of LiNi0.4Co0.2Mn0.4O2and LiMn2O4 materials. The co-mixed material with the ratio of 8∶ 2 is the best.

关 键 词：LiNi0.4Co0.2Mn0.4O2 LIMN2O4 共混正极材料 锂离子电池 电化学性能 

分 类 号：O646[理学—物理化学]