Jiang Jianbing, Du Ke, Cao Yanbing, Peng Zhongdong, Hu Guorong
J Nanosci Nanotechnol. 2015 Jan;15(1):421-5. doi: 10.1166/jnn.2015.8661.
Spherical Mn3O4 has been successfully synthesized by a controlled crystallization method. Then, micro-spherical particle of and LiMn(2-x)Co(x)O4 (X = 0, 0.01, 0.02, 0.03) were synthesized by using the as-prepared spherical Mn3O4Co3O4 and Li2CO3 as raw materials. The influences of Co doping on the structure, morphology and electrochemical performance were studied by X-ray diffraction (XRD), scanning electron microscopy (SEM) and charge-discharge test. As a result, there is little difference between LiMn2O4 and Co-doped samples in structure and morphology. But Co doping has improved the cycle performance. LiMn1.97Co0.02O4 has an initial discharge specific capacity of 116.8 mA h/g at discharge current of 296 mA/g between 3 and 4.3 V, and retains 106.3 mA h/g after 350 cycles. The capacity retention at 55 degrees C is 91.52% after 100 cycles.
通过控制结晶法成功合成了球形Mn3O4。然后，以制备的球形Mn3O4Co3O4和Li2CO3为原料，合成了LiMn(2-x)Co(x)O4（X = 0, 0.01, 0.02, 0.03）的微球形颗粒。通过X射线衍射（XRD）、扫描电子显微镜（SEM）和充放电测试研究了Co掺杂对结构、形貌和电化学性能的影响。结果表明，LiMn2O4与Co掺杂样品在结构和形貌上几乎没有差异。但Co掺杂改善了循环性能。LiMn1.97Co0.02O4在3至4.3 V之间296 mA/g的放电电流下初始放电比容量为116.8 mA h/g，350次循环后保留106.3 mA h/g。在55℃下100次循环后的容量保持率为91.52%。
