Modulating the Li ⁺ /Ni ²⁺ replacement and electrochemical performance optimizing of layered lithium-rich Li 1.2 Ni 0.2 Mn 0.6 O ₂ by minor Co dopant

The influences of the Li ⁺ /Ni ²⁺ replacement modulated by minor Co dopant on cyclic capacity and rate performance of lithium-rich cathode material Li 1.2 Ni 0.2−z/2 Mn 0.6−z/2 Co z O ₂ ( z = 0, 0.02, 0.04, 0.10) were investigated from the microstructural point of view by comprehensive techniques of HRTEM, EELS, SAED, and XRD.