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采用固相反应的方法,以Li2CO3、MnO2、Bi(NO3)3.5H2O和柠檬酸为原料,合成了具有尖晶石结构的锂离子电池正极材料LiMn2-xBixO4(x=0、0.03、0.06)。对材料进行了X射线衍射、扫描电镜、红外光谱、充放电等测试。实验结果表明,所合成的LiMn1.97Bi0.03O4材料具有标准的尖晶石结构,较平滑的表面外观,较高的比容量及优异的循环性能。在0.2C放电速率下,首次放电容量为117.8 mAh/g,循环30次后,容量保持率接近100%。
LiMn2-xBixO4 (x = 0,0.03,0.06) was synthesized by the solid-state reaction method using Li2CO3, MnO2, Bi (NO3) 3.5H2O and citric acid as raw materials to prepare lithium ion battery cathode material with spinel structure. The materials were X-ray diffraction, scanning electron microscopy, infrared spectroscopy, charge and discharge tests. The experimental results show that the synthesized LiMn1.97Bi0.03O4 material has a standard spinel structure, a smoother surface appearance, a higher specific capacity and an excellent cycling performance. At 0.2C discharge rate, the first discharge capacity was 117.8 mAh / g, and after 30 cycles, the capacity retention rate was close to 100%.