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Indexed by:期刊论文

Date of Publication:2015-01-01

Journal:CRYSTENGCOMM

Included Journals:SCIE、Scopus

Volume:17

Issue:27

Page Number:5094-5100

ISSN No.:1466-8033

Abstract:MnCO3 precursors with different morphologies were crystallized using three kinds of surfactants as soft templates, i.e., cation surfactant cetyl trimethyl ammonium bromide (CTAB), anion surfactant sodium dodecyl sulfate (SDS) and neutral poly(vinyl pyrrolidone) (PVP). When PVP was used, the reaction manner was changed from only stirring at room temperature to a hydrothermal route. Under hydrothermal conditions, different ethanol/water ratios and sources of CO32- (NaHCO3 and urea) were used. Porous cubic, regular spherical and nut-like spherical Mn2O3 samples can be obtained by a simple post-annealing process. The correlation between the morphology of Mn2O3 and its performance as an anode material for Li-ion batteries was evaluated. The nut-like spherical Mn2O3 sample has the best cycling performance, with a specific discharge capacity of 925 mA h g(-1) at a current density of 100 mA g(-1) after 180 cycles. The sample composed of cubes and spheres has superior rate performance. The specific discharge capacity decreases with increasing current density from similar to 872 mA h g(-1) at 100 mA g(-1) to similar to 361 mA h g(-1) at 2000 mA g(-1).