Preparation and electrochemical profile of Li0.33MnO2 nanorods as cathode material for secondary lithium batteries

We report the preparation of Li0.33MnO2 nanorods from γ-MnO2 nanorods reacted with LiNO3 by a low temperature solid-state reaction method. The Li0.33MnO2 nanorods tend to be oriented along the b-axis, and show an improved rate capability and cycling performance as positive electrode for lithium battery. It delivers a discharge capacity of 199 and 129 mAh/g at the current rate of 0.1 C (20 mA/g) and 2 C, respectively, and keeps 92% of initial capacity over 100 cycles. Li0.33MnO2 nanorods reduce both the electrode bulk resistance and charge-transfer resistance for lithium-ion intercalation. The advantage of nanorods results from good electrical conduction, appropriate length of nanorod and small volume expansion from appropriate orientations of tunnels structure.