中文摘要：

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。

英文摘要：

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.