以高纯金属锰粉和碳酸锂为原料,通过机械活化氧化法合成了尖晶石 LiMn2 O4材料。采用 X 射线衍射(XRD)和扫描电镜(SEM)对 LiMn2 O4样品结构及形貌进行表征,用充放电测试和交流阻抗技术对LiMn2 O4样品进行电化学性能研究。结果表明,所制备的LiMn2 O4具有完整的尖晶石型结构,且颗粒形貌规整,颗粒大小均匀。所制备的 LiMn2 O4材料室温(25℃)在3.0~4.3 V 电压范围,在0.1 C 倍率下首次放电比容量为125.8 mAh/g；2 C 首次放电容量为120.1 mAh/g,300次循环后放电容量保持103.9 mAh/g,容量保持率为86.51%。且样品具有较好的高温性能和较小的阻抗。
LiMn2 O4 has been successful synthesized by the mechanical-activation-oxidation method from high purity manganese powder and Li2 CO3 .The crystal structure,morphology and electrochemical performance of LiMn2 O4 have been characterized by X-ray diffraction (XRD),scanning electron microscopy (SEM),charge-discharge test and AC impedance.The results show that the LiMn2 O4 has spinel structure and exhibits uniform particle size distribution.The initial discharge capacities of the LiMn2 O4 are as high as 125.8 mAh/g at 0.1 C and 120.1 mAh/g at 1 C in the voltage range of 3.0-4.4 V at 25 ℃,especially,the discharge capacity retains 103.9 mAh/g at 1 C after 500 cycles.Besides,the as-prepared LiMn2 O4 presents good high temperature per-formance and smaller electrochemical impedance.
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