Facile Synthesis of Nanorod-like Single Crystalline Na_0.44MnO₂for High Performance Sodium-Ion Batteries

Single crystalline Na 0.44 MnO 2 nanorods of the orthorhombic tunnel structure have been prepared via reverse microemulsion method. As a cathode material, the Na 0.44 MnO 2 electrode exhibits a reversible capacity of 85.14 mAh g −1 at the current density of 100 mA g −1 , with 94.4% capacity retention for 50 cycles. It also demonstrates good high-rate performance, delivering approximately 63.1% of the initial capacity at a current density of 1000 mA g −1 . The outstanding results prove that Na 0.44 MnO 2 is a promising cathode material for sodium-ion batteries.