Co含量的影响.pdf

Available online at Materials Letters 62 (2008) 3010 – 3013 /locate/matlet Comparative study of layered 0.65Li[Li Mn ]O ·0.35LiMO (M=Co, 1/3 2/3 2 2 Ni 1/2Mn1/2 and Ni1/3Co1/3Mn1/3) cathode materials Lingyan Yu a,b , Weihua Qiu a,⁎, Fang Lian a , Wei Liu a , Xiaoli Kang a , Jiayuan Huang a a Beijing Key Laboratory of New Energy Materials and Technologies, School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China b Sinosteel Luoyang Institute of Refractories Research, Luoyang 471039, China Received 19 September 2007; accepted 30 January 2008 Available online 16 February 2008 Abstract The layered cathode materials 0.65Li[Li Mn ]O ·0.35LiMO (M=Co, Ni Mn and Ni Co Mn ) were synthesized by a low-heating solid 1/3 2/3 2 2 1/2 1/2 1/3 1/3 1/3 state reaction. The XRD results showed that the superlattice peaks became weaker as the Co content increased and the involvement of Co helped to reduce the cation mixing. When cycled between 2.5 and 4.4 V at 0.5 C, the Ni1/2Mn1/2 and Ni1/3Co1/3Mn1/3 containing electrodes showed excellent cycle performances and their ca