Facile synthesis of P2-type Na0.4Mn0.54Co0.46O2 as a high capacity cathode material for sodium-ion batteries

作者：Xu, Xijun; Ji, Shaomin^*; Gao, Ruibo; Liu, Jun

来源：RSC Advances, 2015, 5(63): 51454-51460.

DOI：10.1039/c5ra06275f

• HOLLOW MICROSPHERES
• POSITIVE ELECTRODE
• STABLE ANODES
• METAL-OXIDE
• LITHIUM
• INTERCALATION
• PERFORMANCE
• P2-NA2/3CO2/3MN1/3O2
• NANOMEMBRANES
• NAXCOO2

Sodium-ion batteries have received great attention because of the abundant sodium resources and low cost. As a typical kind of cathode material for Na-ion batteries, sodium manganese oxides have shown great potential in cathode application due to their high specific capacity and good rate capability. Herein, we successfully synthesized P2-type Na0.4Mn0.54Co0.46O2 nanosheets via a two-step annealing route. The morphology and structural information of the Na0.4Mn0.54Co0.46O2 products were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM) and high resolution transmission electron microscopy (HRTEM) technologies. The electrochemical performances of Na0.4Mn0.54Co0.46O2 were measured by charge-discharge tests, cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). As the cathode for Na-ion batteries, the layered Na0.4Mn0.54Co0.46O2 nanosheets showed a high second charge capacity of 194 mA h g(-1) and delivered a specific capacity of 125 mA h g(-1) at a current of 20 mA g(-1) after 60 cycles.

• 出版日期2015
• 单位湘潭大学