锂离子电池正极材料锰酸锂派生物LiMn_(1.75)Me_(0.25)O_4(Me=Ti,Fe,Ni)的制备与表征

Preparation and characterization of LiMn_(1.75)Me_(0.25)O_4 (Me=Ti, Fe, Ni) for lithium-ion battery cathode material

在合成纯相尖晶石型锰酸锂的基础上 ,采用固相分段法制备了锰酸锂派生物LiMn1.75Ti0 .2 5O4 ,LiMn1.75Fe0 .2 5O4 和LiMn1.75Ni0 .2 5O4 。用XRD ,SEM和粒度测试仪分别对试样进行了表征。电化学检测表明 ,Fe和Ni元素能够提高锰酸锂的放电平台电压 ,Ti元素不能改善锰酸锂的电化学性能。从结构化学角度初步探讨了Fe ,Ni和Ti元素对纯相尖晶石型锰酸锂结构的影响。

On the basis of synthesizing pure spinel type lithium manganese oxides, the derivations such as LiMn 1.75Ti 0.25O 4, LiMn 1.75Fe 0.25O 4 and LiMn 1.75Ni 0.25O 4 were prepared by using solid-step-sintering method. The structures were characterized by means of XRD, SEM and particle analyzer. The electrochemical measurement results show that the element of iron or nickel can raise the discharging plateau voltage of LiMn 2O 4, while element titanium destroys the electrochemical property of LiMn 2O 4. The influence of elements of iron, nickel and titanium on the structure of LiMn 2O 4 pure phase was discussed in the viewpoint of structural chemistry.