亚微米LiCu0.1Mn1.9O3.9F0.1电极活性材料的合成与性能

采用溶胶-凝胶法制备了F-和Cu2＋复合掺杂的LiCu0.1Mn1.9O3.9F0.1锂离子电池正极材料. XRD和SEM表征表明合成产物具有良好的尖晶石结构，样品粒度为亚微米级，且分布均匀；电化学性能测试结果表明，掺杂后样品的电化学阻抗较小，首次放电容量达112 mA×h/g，充放电循环50次后，容量保持率为89.1%，电极材料具有较好结构稳定性和电化学性能. 同时还探讨了LiCu0.1Mn1.9O3.9F0.1的合成及掺杂机理.

Synthesis and Property Characterization of Submicron LiCu0.1Mn1.9O3.9F0.1 Electrode Material for Lithium-ion Batteries

F- and Cu2+ co-doped LiCu0.1Mn1.9O3.9F0.1 was prepared with sol-gel method. XRD and SEM analysis demonstrated that the sample had perfect spinel type structure, and the sizes of particles were up to submicron level with homogenous distribution. Electrochemical tests showed that the doping of F- and Cu2+ decreased the charge transfer resistance. The discharge capacity for the LiCu0.1Mn1.9O3.9F0.1 was 112 mA×h/g. In particular, the discharge capacity retention was 89.1% after 50 charge-discharge cycles, suggesting the good structural stability and electrochemical properties of the prepared samples. In addition, the mechanism of improvement for co-doped LiCu0.1Mn1.9O3.9F0.1 was also discussed.