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采用固相法合成了尖晶石型LiMn2O4,并通过溶胶-凝胶法制备了不同物质的量的百分比含量Li4Ti5O12包覆的正极材料。X-射线衍射和扫描电镜结果表明,Li4Ti5O12微粒包覆在LiMn2O4的表面没有产生晶体结构的变化。实验电池在室温下,以1C,2C和5C倍率作充放电循环测试;结果表明,与未包覆的LiMn2O4相比,表面包覆Li4Ti5O12微粒的正极材料在高倍率下具有更好的循环稳定性。
The spinel LiMn2O4 was synthesized by the solid state method and the Li4Ti5O12 cathode material was prepared by sol-gel method. X-ray diffraction and scanning electron microscopy showed that the Li4Ti5O12 particles coated on the surface of LiMn2O4 did not produce changes in crystal structure. The experimental batteries were tested at 1C, 2C and 5C rates for charge-discharge cycles at room temperature. The results showed that the positive electrode materials with Li4Ti5O12 particles coated on the surface had better cycling stability at high rates than the uncoated LiMn2O4 .