Synthesis and electrochemical characteristics of xLi_2MnO_3·(1-x)Li(Ni_(1/3)Co_(1/3)Mn_(1/3))O_2 compounds  

作　　者：Ling-yan Yu Wei-hua Qiu Jia-yuan Huang Fang Lian 

机构地区：[1]School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China [2]Sinosteel Luoyang Institute of Refractories Research Co., Ltd., Luoyang 471039, China

出　　处：《International Journal of Minerals,Metallurgy and Materials》2009年第4期458-462,共5页矿物冶金与材料学报（英文版）

基　　金：supported by the National Natural Science Foundation of China(No.50472093,50702007)

摘　　要：xLi2MnO3·（1-x）Li（Ni1/3Co1/3Mn1/3）O2 （x=0.25, 0.40, 0.55） compounds were prepared by low-heating solid state reaction. In the voltage range of 2.70-4.35 V, the discharge capacity of the electrode decreased with the increase of x, with a better cyclability. However, when cycled between 2.7 and 4.6 V, the cathodes delivered much larger capacities and their capacities increased with the introduction of Li2MnO3. Moreover, it was found that the discharge capacity gradually increased with the cycle number. The reason for this phenomenon was discussed. It was found that the relatively low cut-off potential made the activation of the Li2MnO3 component in the compound a gradual process, which caused the increasing capacity.xLi2MnO3·（1-x）Li（Ni1/3Co1/3Mn1/3）O2 （x=0.25, 0.40, 0.55） compounds were prepared by low-heating solid state reaction. In the voltage range of 2.70-4.35 V, the discharge capacity of the electrode decreased with the increase of x, with a better cyclability. However, when cycled between 2.7 and 4.6 V, the cathodes delivered much larger capacities and their capacities increased with the introduction of Li2MnO3. Moreover, it was found that the discharge capacity gradually increased with the cycle number. The reason for this phenomenon was discussed. It was found that the relatively low cut-off potential made the activation of the Li2MnO3 component in the compound a gradual process, which caused the increasing capacity.

关 键 词：lithium-ion batteries cathode materials synthesis method layered oxides 

分 类 号：TF1[冶金工程—冶金物理化学]