Layer-structured cathode materials for lithium-ion batteries are considered. These materials, such as LCO, NCM, NCA, lithium rich cathode oxides and blended cathodes are well-known for the intercalation mechanism. Future of lithium-ion batteries is also strongly based on these cathode chemistries, but to overcome some drawbacks and challenges, the improved materials are needed. In this chapter, modification of layer-structured cathode materials by doping and coating are discussed. Especially, coating materials and doping methods are considered.