Catalog Home Page

The effect of B4C addition to MnO2 in a cathode material for battery applications

Minakshi, M., Blackford, M.G., Thorogood, G.J. and Issa, T.B. (2010) The effect of B4C addition to MnO2 in a cathode material for battery applications. Electrochimica Acta, 55 (3). pp. 1028-1033.

[img]
Preview
PDF - Authors' Version
Download (497kB) | Preview
    Link to Published Version: http://dx.doi.org/10.1016/j.electacta.2009.09.062
    *Subscription may be required

    Abstract

    Boron carbide (B4C) added manganese dioxide (MnO2) used as a cathode material for a Zn–MnO2 battery using aqueous lithium hydroxide (LiOH) as the electrolyte is known to have higher discharge capacity but with a lower average discharge voltage than pure MnO2 (additive free). The performance is reversed when using potassium hydroxide (KOH) as the electrolyte. Herein, the MnO2 was mixed with 0, 5, 7 and 10 wt.% of boron carbide during the electrode preparation. The discharge performance of the Zn|LiOH|MnO2 battery was improved by the addition of 5–7 wt.% boron carbide in MnO2 cathode as compared with the pure MnO2. However, increasing the additive to 10 wt.% causes a decrease in the discharge capacity. The performance of the Zn|KOH|MnO2 battery was retarded by the boron carbide additive. Transmission electron microscopy (TEM), and energy dispersive X-ray spectroscopy analysis (EDS) results show evidence of crystalline MnO2 particles during discharging in LiOH electrolyte, whereas, manganese oxide particles with different oxygen and manganese counts leading to mixture of phases is observed for KOH electrolyte which is in agreement with X-ray diffraction (XRD) data. The enhanced discharge capacity indicates that boron atoms promote lithium intercalation during the electrochemical process and improved the performance of the Zn|LiOH|MnO2 battery. This observed improvement may be a consequence of B4C suppressing the formation of undesirable Mn(III) phases, which in turn leads to enhanced lithium intercalation. Too much boron carbide hinders the charge carrier which inhibits the discharge capacity.

    Publication Type: Journal Article
    Murdoch Affiliation: School of Chemical and Mathematical Science
    Publisher: Elsevier
    Copyright: © 2009 Elsevier Ltd
    URI: http://researchrepository.murdoch.edu.au/id/eprint/4419
    Item Control Page

    Downloads

    Downloads per month over past year