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

• DOI: 10.1016/j.electacta.2013.06.094
• Publication Date: 2013-07-02T12:03:29Z
• Authors: Shahid Rasul; Shinya Suzuki; Shu Yamaguchi; Masaru Miyayama
• Keywords: Acetylene black composite; Li ion batteries; Mg ion batteries; 02 engineering and technology; Octahedral molecular sieves (OMS); 0210 nano-technology; Insertion electrodes

Abstract Magnesium has been inserted electrochemically into manganese oxide octahedral molecular sieves (OMS-5 MnO 2 ) 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(ClO 4 ) 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 Mn 4+ to Mn 2+ . 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.