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  • Title: Controllable synthesis of hollow bipyramid β-MnO(2) and its high electrochemical performance for lithium storage.
    Author: Chen WM, Qie L, Shao QG, Yuan LX, Zhang WX, Huang YH.
    Journal: ACS Appl Mater Interfaces; 2012 Jun 27; 4(6):3047-53. PubMed ID: 22658801.
    Abstract:
    Three types of MnO2 nanostructures, viz., α-MnO2 nanotubes, hollow β-MnO2 bipyramids, and solid β-MnO2 bipyramids, have been synthesized via a simple template-free hydrothermal method. Cyclic voltammetry and galvanostatic charge/discharge measurements demonstrate that the hollow β-MnO2 bipyramids exhibit the highest specific capacity and the best cyclability; the capacity retains 213 mAh g(-1) at a current density of 100 mA g(-1) after 150 cycles. XRD patterns of the lithiated β-MnO2 electrodes clearly show the expansion of lattice volume caused by lithiation, but the structure keeps stable during lithium insertion/extraction process. We suggest that the excellent performance for β-MnO2 can be attributed to its unique electrochemical reaction, compact tunnel-structure and hollow architecture. The hollow architecture can accommodate the volume change during charge/discharge process and improve effective diffusion paths for both lithium ions and electrons.
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