Lithiated spinel manganese dioxide was synthesised from electrochemical MnO 2 and Li 2 CO 3 with deficiency or excess lithium (Li x Mn 2 O 4 , 0.8 < x < 1.3) for use in Li/Li x Mn 2 O 4 and Li-ion cells. Micron-sized Li 1 . 0 5 Mn 2 O 4 prepared at 730 o C showed high Li utilization, excellent cyclability and good rate capability with an initial discharge capacity of 123 mA h/g and 10% discharge capacity reduction after 20 cycles. Different types of commercial carbonaceous materials were also investigated with respect to their electrochemical performance vs. Li. Unoptimised Li-ion cells, using Li 1 . 0 5 Mn 2 O 4 prepared at 730 o C as the cathode material, EC-DMC-LiPF 6 electrolyte and carbon fibres, showed promising performance characteristics.