Electrochemical and structural comparison of doped lithium manganese spinels

Lithium cobalt mixed doped lithium manganese spinels Li1(Mn1.9−xCo0.1Lix)O4 (0≤x≤0.1) were prepared by heat treatment (750°C for 12 h) of solution precipitated precursors. Samples were characterised structurally and electrochemically by XRD and galvanostatic cycling. Permanent cycling, storage in the charged state, and storage in the discharged state were tested. Under the cycling conditions of this study, mixed doped lithium manganese spinels present better cycling and storage stabilities than a respective Co-doped spinel. There are hints for a considerable occupation of site 16c by lithium ions. The electrochemical behaviour is similar to that of an undoped spinel for low values of x and is similar to that of lithium doped spinels for high values of x.