【摘要】 采用固相反应法合成了不同组成的锂离子蓄电池正极材料LixMn2 O4,并考察了材料组成对其结构和性能的影响。结果表明 ,随着nLi/nMn比值的提高 ,材料的晶格常数逐渐减小 ,电化学比容量随之降低 ,循环性能明显趋好 ;配比为x =1.0 5的材料倍率特性最好 ,其比容量和平均放电电位随放电倍率提高而降低幅度最小 ;x >1.0 5时的材料即使在 1C下也具有良好的循环性能更多还原

【Abstract】 Spinel Li xMn 2O 4 with various compositions were synthesized, and the effects of composition on the structure and the performance of spinel Li xMn 2O 4 were investigated. The results show that with the increase of n Li /n Mn molar ratio, the lattice constant and the specific capacity of the material decreases while its cycling stability increases. The material with optimum n Li /n Mn molar ratio x=1.05 has the best rate capability, of which the specific capacity and the discharge potential varies least with the increasing of discharge rate. The Li xMn 2O 4 material with x>1.05 shows ideal cycling stability even at 1 C rate.更多还原