A green and facile hydrothermal synthesis of γ-MnOOH nanowires as a prospective anode material for high power Li-ion batteries

In the present work, an oxidation-crystallization-reduction route in the hydrothermal systems has been demonstrated to be facile and feasible in the large-scale production of gamma-MnOOH nanowires. The whole is green and cheap only using Mn2+ and polyvinylpyrrolidone without adding any oxide agent or template. The structure and morphology of the as-synthesized samples are characterized by X-ray diffraction, scanning electron microscopy, Transmission electron microscopy, Infrared active spectrum, Raman spectrum, thermogravimetry, cyclic voltammetry, galvanostatic charge/discharge, and electrochemical impedance spectroscopy. As anode of lithium-half cells, gamma-MnOOH nanowires exhibit enhanced cycling performance and rate capacity in comparison with the previous reports. A high capacity of up to 393.9 mAh g(-1) with a Coulombic efficiency of nearly 100% is obtained at 0.1C after 100 cycles, which presents a promising application as anode materials for lithium power batteries. (C) 2019 Elsevier B.V. All rights reserved.