Storage performance of the doped Li-Mn-O spinels

A series of Ti-doped,Ti-Ni-doped and Ti-Co-doped spinels were synthesized by using Ti-doped electrolytic manganese dioxides(Ti-EMD).The charge-discharge cycles showed that Ti-doped sample prepared at 600℃,spinels without doping sintered at 600 and 750℃,exhibited a initial capacity of 205,189 and 207mAh/g in the 1st 40-cycles,respectively.And which exhibited an initial capacity of 175,135 and 126mAh/g and the capacity attenuation ratio was 16%,47% and 52% after cycled and stored for 3 months,respectively.X-ray photoelectron spectra,IR experiments showed that the titanium doped strengthens the combining energies of oxygen atom in the Ti doped spinels.Herein,titanium dopant can improve the discharge and storage performance for spinels.