Structure and Electrochemical Performance of Li[Ni1−x−yCoxMny]O2 [0.025 ≤ x ≤ 0.4, 0.015 ≤ y ≤ 0.25] as Cathodes Compound for Lithium Ion Batteries
Abstract:Li[Ni1−x−yCoxMny]O2 (0.025 ≤ x ≤ 0.4, 0.015 ≤ y ≤ 0.25) electrode powders were prepared by a solid-state reaction. The phase purity and R-3m layered structure of the synthesized Li[Ni1−x−yCoxMny]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∼0.3 m 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 LiNi1/3Co1/3Mn1/3O2 powder, its specific capacity was higher due to the higher Co contents.
Document Type: Research Article
Publication date: October 1, 2008
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