FLUX SYNTHESIS OF Na0.44MnO2 NANORIBBONS AND THEIR ELECTROCHEMICAL PROPERTIES FOR Na-ION BATTERIES

Well-crystallized Na0.44MnO2 is readily synthesized via a facile NaCl-flux reaction at 850 degrees C for 5 h. The Na0.44MnO2 material exhibits a well-defined nanoribbon structure with dimension of 50-100 nm in thickness and 200-500 nm in width. Electrochemical properties of as-prepared Na0.44MnO2 are thoroughly investigated on assembled nonaqueous Na0.44MnO2//Na cells using cyclic voltammetry, galvanostatic test, and electrochemical impedance spectroscopy. The results show that the Na0.44MnO2 nanoribbon material can deliver a high capacity of 106 mAh g(-1) with stable cycling performance over 40 cycles. In addition, it exhibits a favorable rate capability, delivering a capacity of 90 mAh g(-1) at a rate of 1 C. The high capacity retention combined with acceptable rate capability makes the Na-0.44MnO2 a promising electrode material for advanced Na-ion batteries.