Key factors controlling the electrochemical performance of the cation-deficient mixed spinel oxide Mn2.2Co0.27O4 as cathode in 3 V rechargeable lithium batteries

The synthesis and the structural features of a mixed manganese-cobalt oxide , Mn2.2Co0.27O4 obtained at low temperature (400 degreesC) are reported. El ectrochemical lithium insertion occurs in one reduction process located aro und 2.8 V, involving only the reduction of manganese ions in the oxide. Dur ing cycling experiments, performed with various experimental conditions, th e best results show a high capacity retention, i.e. 85% of the initial spec ific capacity (95 A h/kg) after the 20th cycle. (C) 2001 Elsevier Science B .V. All rights reserved.