FePO_4包覆的LiMn_(1.5)Ni_(0.5)O_4/Li_(3.9)Na_(0.1)Ti_5O_(12)全电池性能  

Performance of FePO_4 coated LiMn_(1.5)Ni_(0.5)O_4/Li_(3.9)Na_(0.1)Ti_5O_(12) full battery system

作　　者：朱彦荣[1] 陈宾[1] 郝国栋[2] 伊廷锋[1,3] 诸荣孙[1] 

机构地区：[1]安徽工业大学化学与化工学院,安徽马鞍山243002 [2]牡丹江师范学院化学与化工学院,黑龙江牡丹江157012 [3]超威电源有限公司,浙江湖州313100

出　　处：《电源技术》2015年第5期896-899,共4页Chinese Journal of Power Sources

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);国家自然科学基金资助项目(51404002;51274002);浙江省博士后科研择优资助项目(Bsh1201013);安徽工业大学创新团队资助项目(TD201202)

摘　　要：分别采用溶胶凝胶法和高温固相法合成了Fe PO4包覆的Li Mn1.5Ni0.5O4正极材料和Li3.9Na0.1Ti5O12负极材料,并组装了Li Mn1.5Ni0.5O4/Li3.9Na0.1Ti5O12(LMNO/LNTO)全电池,采用充放电测试、循环伏安(CV)和电化学阻抗(EIS)研究了Fe PO4包覆对Li Mn1.5Ni0.5O4/Li4Ti5O12全电池电化学性能的影响。结果表明,Fe PO4的包覆抑制了Li Mn1.5Ni0.5O4高温合成时Mn3+的产生,有利于锂离子的可逆脱嵌。Fe PO4包覆的Li Mn1.5Ni0.5O4/Li3.9Na0.1Ti5O12(FP-LMNO/LNTO)比LMNO/LTO全电池具有更高的放电容量、循环性能、库仑效率和能量密度。FP-LMNO/LNTO全电池更适合作为动力锂离子电池。FePO4 coated LiMn1.5Ni0.5O4 cathode materials and Li3.9Na0.1Ti5O12 anode materials were prepared by sol-gel and solid-state reaction method at high temperature, respectively. LiMn1.5Ni0.5O4/Li3.9Na0.1Ti5O12 （LMNO/LNTO） full battery system was assembled. The effect of FePO, coating on the electrochemical performance of LiMn1.5Ni0.5O4/Li3.9Na0.1Ti5O12 full battery system was investigated by charge-discharge tests, cyclic voltammetry （CV） and electrochemical impedance spectroscopy （EIS）. The result shows that the formation of Mn^3＋ is suppressed by FePO4 coating during the high temperature synthesis of LiMn1.5Ni0.5O4. The FePO4 coating is beneficial to the reversible intercalation and deintercalation of lithium ions. FePO4 coatedLiMn1.5Ni0.5O4/Li3.9Na0.1Ti5O12 （FP-LMNO/LNTO） has higher discharge capacity, cycling performance, coulombic efficiency and energy density than those of LMNO/LTO full battery. FP-LMNO/LNTO full battery is more suitable for power lithium ion battery.

关 键 词：锂离子电池 Li3.9Na0.1Ti5O12 LiMn1.5Ni0.5O4 电化学性能 全电池 

分 类 号：TM912[电气工程—电力电子与电力传动]