title: Structure and electrochemical performance of Li[Ni(1 -x-y)Co(x)Mn(y)]O2 [0.025 < or = x < or = 0.4, 0.015 < or = y < or = 0.25] as cathodes compound for lithium ion batteries.
abstract: Li[Ni(1-x-y)Co(x)Mn(y)]O2 (0.025 < or = x < or = 0.4, 0.015 < or = y < or = 0.25) electrode powders were prepared by a solid-state reaction. The phase purity and R-3m layered structure of the synthesized Li[Ni(1-x-y)Co(x)Mn(y)]O2 materials were confirmed by X-ray diffraction analysis. The particle size of the powder/compounds was decreased with increasing Co and Mn contents to a minimum average particle size of 0.2 approximately 0.3 microm for the LiNi0.35Co0.4Mn0.25O2 powder. A specific capacity of 187 mAh/g was obtained for the LiNi0.35Co0.4Mn0.25O2 electrode with good capacity retention when cycled in the potential region of 3.0-4.6 V with a current density of 20 mA/g at room temperature. Although the structural parameters of the LiNi0.35Co0.4Mn0.25O2 cathode material were similar to those of the LiNil/3CO1/3Mn1/3O2 powder, its specific capacity was higher due to the higher Co contents.
authors.affiliation: Department of Materials Science and Engineering, Chonnam National University, 300 Yongbongdong, Bukgu, Gwangju 500-757, South Korea.
authors.forename: Y G
authors.initials: YG
authors.lastname: Choi
authors.forename: D H
authors.initials: DH
authors.lastname: Kim
authors.forename: J S
authors.initials: JS
authors.lastname: Im
authors.forename: J W
authors.initials: JW
authors.lastname: Kang
authors.forename: E J
authors.initials: EJ
authors.lastname: Kim
authors.forename: J
authors.initials: J
authors.lastname: Kim