title: Facile controlled synthesis of MnO2 nanostructures of novel shapes and their application in batteries.
abstract: In this paper, MnO2 nanomaterials of different crystallographic types and crystal morphologies have been selectively synthesized via a facile hydrothermal route and electrochemically investigated as the cathode active materials of primary and rechargeable batteries. Beta-MnO2 nano/microstructures, including one-dimensional (1-D) nanowires, nanorods, and nanoneedles, as well as 2-D hexagramlike and dendritelike hierarchical forms, were obtained by simple hydrothermal decomposition of an Mn(NO3)2 solution under controlled reaction conditions. Alpha- and gamma-MnO2 nanowires and nanorods were also prepared on the basis of previous literature. The as-synthesized samples were characterized by instrumental analyses such as XRD, SEM, TEM, and HRTEM. Furthermore, the obtained 1-D alpha- and gamma-MnO2 nanostructures were found to exhibit favorable discharge performance in both primary alkaline Zn-MnO2 cells and rechargeable Li-MnO2 cells, showing their potential applications in high-energy batteries.
authors.affiliation: Institute of New Energy Material Chemistry, Nankai University, Tianjin 300071, PR China.
authors.forename: Fangyi
authors.initials: F
authors.lastname: Cheng
authors.forename: Jianzhi
authors.initials: J
authors.lastname: Zhao
authors.forename: Wene
authors.initials: W
authors.lastname: Song
authors.forename: Chunsheng
authors.initials: C
authors.lastname: Li
authors.forename: Hua
authors.initials: H
authors.lastname: Ma
authors.forename: Jun
authors.initials: J
authors.lastname: Chen
authors.forename: Panwen
authors.initials: P
authors.lastname: Shen