MODIFICATION OF STRUCTURAL AND TRANSPORT PROPERTIES OF LAYERED Li_xNi_1-y-zCo_yMn_zO₂ CATHODE MATERIALS

Abstract

Structural and transport properties of pristine Li x Ni 1-y-z Co y Mn z O 2 (y = 0.25, 0.35, 0.5, 0.6; z = 0.1, 0.2) and LiNi 0.63 Cu 0.02 Co 0.25 Mn 0.1 O 2 materials are presented. Among LiNi 1-y-z Co y Mn z O 2 pristine oxides, LiNi 0.65 Co 0.25 Mn 0.1 O 2 presents the best transport properties. Strong decrease of electrical conductivity of Li x Ni 0.65 Co 0.25 Mn 0.1 O 2 and Li x Ni 0.55 Co 0.35 Mn 0.1 O 2 compositions upon lithium deintercalation was observed. Cu doping in LiNi 0.63 Cu 0.02 Co 0.25 Mn 0.1 O 2 improves the transport properties during deintercalation process. Li x Ni 0.65 Co 0.25 Mn 0.1 O 2 and Li x Ni 0.63 Cu 0.02 Co 0.25 Mn 0.1 O 2 retain structural stability up to x Li = 0.35 mol.