Mo^(6+)掺杂对LiNi_(0.5)Mn_(1.5)O_4正极材料脱锂动力学的影响  

Effect of Mo^(6+) doping on the extraction kinetics of LiNi_(0.5)Mn_(1.5)O_4 positive-electrode material

作　　者：朱彦荣[1] 张瑞[1] 李紫宇 郝国栋[2] 周安娜[1] 诸荣孙[1] 伊廷锋[1,3,4] 

机构地区：[1]安徽工业大学化学与化工学院,马鞍山243002 [2]牡丹江师范学院化学与化工学院,牡丹江157012 [3]超威电源有限公司,湖州313100 [4]哈尔滨工业大学化工学院,哈尔滨150001

出　　处：《化工新型材料》2015年第1期104-106,共3页New Chemical Materials

基　　金：牡丹江市科技攻关项目(G2012g0008);黑龙江省教育厅科技项目(11521575);国家自然科学基金(51274002);中国博士后科学基金(2012M520749);浙江省博士后科研择优资助项目(Bsh1201013);安徽工业大学优秀创新团队项目(TD201202);安徽工业大学大学生科研训练项目(2013024Z);地方高校国家级大学生创新创业训练计划项目(201310360029)

摘　　要：采用溶胶-凝胶法制备了尖晶石型LiNi0.5Mn1.5O4及其掺杂材料LiMn1.4Ni0.55Mo0.05O4,并采用电化学阻抗(EIS)研究了材料充电态的锂离子嵌脱动力学。结果表明,Mo的掺杂降低了LiNi0.5Mn1.5O4材料的电荷转移电阻,提高了其电导率,进而提高了其动力学性能。Mo掺杂减小LiNi0.5Mn1.5O4材料的SEI膜厚度,有利于锂离子的可逆脱嵌,进而提高了其电化学性能。LiNi0.5Mn1.5O4及其掺杂材料LiMn1.4Ni0.55Mo0.05O4的界面电容(Cdl)值差别不大,说明Mo掺杂后,并没有影响电极材料的表面积或形貌。Spinel LiNi0.5Mn1.5O4 and LiMn1.4Ni0.55Mo0.05O4 materials were synthesized by sol-gel method, and the electrochemical intercalation and deintercalation kinetics of the charged materials were evaluated by electrochemical impedance spectroscopy （EIS）. The result showed that the SEI film thickness of LiNi0.5Mn1.5O4 material decreased due to the Mo doping, and it was ben eficial to the reversible intercalation/deinterealation of lithium ions, and then the electrochemical performance was improved. There was a little distinction of interracial capacitance （Cdl） values between LiNi0.5Mn1.5O4 and LiMn1.4Ni0.55Mo0.05O4 materials. This indicated that Mo doping did not significantly affect the morphology and size of the LiNi0.5Mn1.5O4.

关 键 词：锂离子电池 正极材料 LINI0.5MN1.5O4 动力学性能 Mo掺杂 

分 类 号：TM912[电气工程—电力电子与电力传动]