【摘要】 采用溶胶-凝胶结合固相烧结法制备具有复杂尖晶石结构（空间群为P4332）的Li₂Mn₁-xZnxTi₃O₈（x=0,0.1,0.5）负极材料,研究锌部分取代锰对Li2Mn Ti₃O₈材料微观结构及电化学性能的影响。结果显示,锌取代之后,Li₂MnTi₃O₈材料的晶胞体积以及晶粒尺寸有明显的降低,然而颗粒大小却没有显著的变化。锌取代对改善Li₂Mn Ti₃O₈材料电化学性能非常有利,在0.1C倍率条件下充放电,50次充放电循环,Li₂Mn Ti₃O₈,Li₂Mn_0.9Zn_0.1Ti₃O₈和Li₂Mn0.5Zn0.5Ti₃O₈放电容量分别为168,269和298 m A·h/g,且都在第一次循环之后表现出优异的循环稳定性。在1C倍率条件下充放电36次,锌取代材料的放电容量和循环稳定性均好于未取代的材料。更多还原

【Abstract】 Spinel Li₂Mn₁-xZnxTi₃O₈（ x = 0,0. 1,0. 5） as anode materials for lithium batteries are prepared by a sol-gel process and solid state sintering. The effects of Zn substitution on the microstructure and electrochemical properties of Li2 Mn Ti3O8material are investigated. The results show that with the substitution of Zn,there is an apparent reduction on the unit cell volume and the grain size,but the active particles size is not remarkably grown. The Zn substitution is quite beneficial to the improvement of the electrochemical properties. After 50 cycles at 0. 1C,the discharge capacities of Li₂Mn Ti₃O₈,Li₂Mn_0.9Zn_0.1Ti₃O₈ and Li₂Mn_0.5Zn_0.5Ti₃O₈ are 168,269 and 298 m A·h / g,respectively,and the cycling stabilities of three materials are all excellent. After 36 cycles at 1C,the discharge capacities and cycling stability of the Zn-substituted materials are better than that without substitution.更多还原