Preparation of PPy-Coated MnO Hybrid Micromaterials and Their Improved Cyclic Performance as Anode for Lithium-Ion Batteries.

MnO@PPy core-shell micromaterials are prepared by chemical polymerization of pyrrole on the MnO surface. The polypyrrole (PPy) is formed as a homogeneous organic shell on the MnO surface. The thickness of PPy shell can be adjusted by the usage of pyrrole.

MnO2 prepared by hydrothermal method and electrochemical performance as anode for lithium-ion battery.

Two α-MnO2 crystals with caddice-clew-like and urchin-like morphologies are prepared by the hydrothermal method, and their structure and electrochemical performance are characterized by scanning electron microscope (SEM), X-ray diffraction (XRD), galvanostatic cell cycling, cyclic voltammetry, and electrochemical impedance spectroscopy (EIS). The morphology of the MnO2 prepared under acidic condition is urchin-like, while the one prepared under neutral condition is caddice-clew-like. The identical crystalline phase of MnO2 crystals is essential to evaluate the relationship between electrochemical performances and morphologies for lithium-ion battery application.