[[abstract]]The LiMn2O4 cathode powders derived from co-precipitation method was calcined with the surface modified material to form fine powder of single spinel phase with different particle size, size distribution and morphology. The structure and phase was identified with X-ray diffractometer (XRD) along with the lattice constant calculated by a least-squares program. The electron probe microanalyzer (EPMA) was employed to evaluate the composition of LiCux Mn2-xO4-coated LiMn2O4. The morphology was observed with field emission scanning electron microscope (FE-SEM), and the particle size in the range of several microns was measured by Laser Scattering. The electrochemical behavior of the cathode powder was examined by using two-electrode test cells consisting of a cathode, metallic lithium as anode, and an electrolyte of 1 M LiPF6. Cyclic charge/discharge testing of the coin cells, fabricated by both LiCuxMn2-xO4-coated and base LiMn2O4 material were conducted. The LiCuxMn2-xO4-coated cathode powder with the fading rate of 11.98% at 0.5 C and 11.93% at 0.2 C showed better cyclability than the base one. It is demonstrated that the employment of LiCuxMn2-xO4-coated LiMn2 O4 cathode material reduced the fading rate after cyclic test, especially at high C rate.
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机译：[[摘要]]将共沉淀法制备的LiMn2O4正极粉与表面改性材料一起煅烧，形成具有不同粒径，尺寸分布和形貌的单尖晶石相细粉。用X射线衍射仪（XRD）识别结构和相，并通过最小二乘程序计算出晶格常数。使用电子探针显微分析仪（EPMA）评估LiCux Mn2-xO4包覆的LiMn2O4的组成。用场发射扫描电子显微镜（FE-SEM）观察形态，并通过激光散射法测量数微米范围内的粒径。通过使用由阴极，金属锂作为阳极和1 M LiPF6电解质组成的两电极测试电池检查阴极粉末的电化学行为。对由LiCuxMn2-xO4涂层和基础LiMn2O4材料制成的纽扣电池进行循环充放电测试。涂有LiCuxMn2-xO4的正极粉在0.5 C时褪色率为11.98％，在0.2 C时褪色率为11.93％，其可循环性比基体更好。结果表明，采用LiCuxMn2-xO4包覆的LiMn2 O4正极材料可降低循环测试后的褪色率，尤其是在高C速率下。
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