Highly Electrochemical Reaction of Lithium in the Ordered Mesoporosus β-MnO₂

Abstract

The highly crystallized β-MnO 2 with the narrowest [1 × 1] channels prepared by direct thermal decomposition of Mn(NO 3 ) 2 does not provide much capacity due to the poor kinetics of the lithium intercalation/deintercalation process. In the present work, we report the preparation and electrochemical performance of an ordered mesoporous β-MnO 2 as a positive electrode for rechargeable lithium batteries. The well-ordered mesoporous β-MnO 2 prepared using mesoporous silica KIT-6 as a template by thermal decomposition of Mn(NO 3 ) 2 exhibits high initial capacity, reaching a chemical composition of Li 0.75 MnO 2, and it also shows a good rate capability and cycling ability. The correlation between the specific mesoporous structure and the superior electrochemical performance was discussed in detail.