The electrochemical performance of a Li-ion battery made from nanometric, highly crystalline LiNi 0.5Mn 1.5O 4 as positive electrode and mesoporous carbon microbeads (MCMBs) as negative electrode was assessed. The best performance was obtained by using a slight excess of spinel (a cathode/anode mole ratio of 1.3) and lithium bis-oxalate borate (LiBOB) instead of LiPF 6 as an electrolyte salt. Higher spinel contents caused the formation of metallic Li in the carbon and the rapid degradation of battery performance as a result. The calculated output energy was 322 Wh kg −1 which is higher than the value reported for the LiMn 2O 4/C cell (250 Wh kg −1).