共沉淀法制备LaF3表面修饰LiNi1／3C01／3Mn1／302及性能研究

以LiNi1／3CO1／3Mn1／302为正极材料，采用共沉淀合成方法制备LaF3表面修饰LiNimCo1/3Mnm02正极材料，利用X射线衍射（XRD）、扫描电镜（SEM）和电化学测试等方法对合成材料的结构、形貌以及电化学性能进行表征。结果表明：经过LaF3表面修饰的LiNi1／3C01／3Mn1／302材料保持了LiNi1／3Co1／3Mn1/302层状结构，其中LaFs表面修饰量为0．59％时，在电压为2．75-4．50V范围内，以0．3mA／cm。电流密度下经恒电流充放电测试，其首次放电比容量为172．7mAh／g，经过50周充放电循环后放电比容量为163．5mAh／g，表现出较高的初始放电比容量和良好的抗过充电性能。

The Synthesis and Properties of LaFa Coated LiNi1/3CO1/3Mn1/3O2 Prepared by Coprecipitation Method

LaF3 coated LiNil/a Co1/3 Mn1/3O2 cathode material was prepared by coprecipitation method. The synthesized material was characterized by means of X--ray diffraction （XRD）, scanning electron microscope （SEM） and galvanostatic charge/discharge cycling. The XRD data of the product show that they are single phases and retain the layered LiNil/3 Co1/3 Mn1/3O2 structure. The synthesized the photocatalytic activity of 0. 59% LaF3 coated LiNi1/3 Co1/3 Mn1/3 02 exhibits a good overcharge tolerance property with initial discharge specific capacity of 172.7 mAh/g and the discharge specific capacity of 163. 5 mAh/g after 50 cycles in the voltage range 2.75-4.50 V at a constant current density of 0.3 mA/cm2.