Progresses and challenges in studies on cathodic materials of Li-Ion battery

The annual and linguistic distributions of papers published in academic journals and patents both applied and issued in the world about cathodic materials, such as LiCoO ₂, LiNiO ₂, LiMn ₂O ₄ , LiFePO ₄ , LiNi ₀ ,Co _0.2O ₂ and Li ( CoMnNi) _l/3 O ² , for Li-ion battery were investigated. The progresses and challenges in studies on the former four materials for Li-ion battery were reviewed. The improvements of cycling capacities and capacity retentions, and safety of those cathodic materials especially used at high rate charge-discharge, through doping, coating and particle size fining as well as new designing cathodic components were extensively discussed.