Manganese oxide octahedral molecular sieves as insertion electrodes for rechargeable Mg batteries

Abstract
Magnesium has been inserted electrochemically into manganese oxide octahedral molecular sieves (OMS-5 MnO2) at room temperature. Discharge/charge profiles show that a large amount of Mg, i.e., 0.37 Mg/Mn can be inserted electrochemically using 1 M Mg(ClO4)2/AN electrolyte when OMS-5 is prepared in presence of acetylene black. X-ray diffraction analysis and discharge/charge profiles verify that a solid state solution reaction takes place upon Mg insertion into the host lattice with concurrent reduction of Mn4+ to Mn2+. However, upon each reduction of Mn by Mg insertion and resultant dissolution into electrolyte, decrease in the active compound occurs consequently. A low intrinsic electronic conductivity of OMS-5 was suggested to play a vital role in Mg insertion into the host. © 2013 Elsevier Ltd.

Citation
Rasul, S., Suzuki, S., Yamaguchi, S., & Miyayama, M. (2013). Manganese oxide octahedral molecular sieves as insertion electrodes for rechargeable Mg batteries. Electrochimica Acta, 110, 247–252. doi:10.1016/j.electacta.2013.06.094

Publisher
Elsevier BV

Journal
Electrochimica Acta

DOI
10.1016/j.electacta.2013.06.094

Permanent link to this record