Formation of Septuple-Shelled (Co2/3 Mn1/3 )(Co5/6 Mn1/6 )2 O4 Hollow Spheres as Electrode Material for Alkaline Rechargeable Battery.

The multishelled (Co2/3 Mn1/3 )(Co5/6 Mn1/6 )2O4 hollow microspheres with controllable shell numbers up to septuple shells are synthesized using developed sequential templating method. Exhilaratingly, the septuple-shelled complex metal oxide hollow microsphere is synthesized for the first time by doping Mn into Co3 O4 , leading to the change of crystalline rate of precursor. Used as electrode materials for alkaline rechargeable battery, it shows a remarkable reversible capacity (236.39 mAh g-1 at a current density of 1 A g-1 by three-electrode system and 106.85 mAh g-1 at 0.5 A g-1 in alkaline battery) and excellent cycling performance due to its unique structure.