(Me=Ti,Fe,Ni)的制备与表征
(东北大学 材料与冶金学院,沈阳 110004)
摘 要: 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LiMn1.75Ti0.25O4,LiMn1.75Fe0.25O4和LiMn1.75Ni 0.25O4。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。
关键字: 锂离子电池;正极材料;锰酸锂;派生物
LiMn1.75Me0.25O4 (Me=Ti, Fe, Ni) for
lithium-ion battery cathode material
(School of Materials and Metallurgy, Northeastern University,
Shenyang 110004, China)
Abstract:On the basis of synthesizing pure spinel type lithium manganese oxides, the derivations such as LiMn1.75Ti0.25O4, LiMn1.75Fe0.25O4 and LiMn1.75Ni0.25O4 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 LiMn2O4, while element titanium destroys the electrochemical property of LiMn2O4. The influence of elements of iron, nickel and titanium on the structure of LiMn2O4 pure phase was discussed in the viewpoint of structural chemistry.
Key words: lithium-ion battery; cathode material; lithium manganate; derivations