【摘要】 采用分步加热高温固相合成法,合成了尖晶石型LiNixMn2-xO4正极材料。用X射线衍射对材料的晶体结构进行了表征和晶胞参数的分析,并进行了电化学性能的研究。实验结果表明,Ni的掺杂对样品的晶胞参数和电化学性能有很大的影响,随着掺镍量的增加,电荷迁移电阻增加。当掺杂量x=0.1时,样品的首次放电容量达到98.2 mAh.g-1,经过100次循环,容量保持在92%以上,样品的循环性能得到了很大的提高。更多还原

【Abstract】 The spinel LiNi_xMn₂-xO₄ samples were prepared by high temperature solid-phase reaction.The structures of prepared cathode materials were characterized by XRD,the electrochemical performance and lattice constants were measured.The experiment shows that the doping nickel has very important effects on the structure and electrochemical performance.The charge transfer impedance increases with an increasing dopant content.When the doping level is x=0.1,the samples display an initial discharging capacity of 98.2 mAh·g^-1.After 100 cycles,more than 92% of the capacity is maintained,the life of chargedischarge is greatly improved.更多还原