High Interfacial Charge Storage Capability of Carbonaceous Cathodes for Mg Batteries
By Wang, Lu; Jiang, Bo; Vullum, Per Erik; Svensson, Ann Mari; Erbe, Andreas; Selbach, Sverre M.; Xu, Huailiang; Vullum-Bruer, Fride
Published in ACS Nano
2018
Abstract
A rechargeable Mg battery where the capacity mainly originates from reversible reactions occurring at the electrode/electrolyte interface efficiently avoids the challenge of sluggish Mg intercalation encountered in conventional Mg batteries. The interfacial reactions in a cell based on microwave-exfoliated graphite oxide (MEGO) as the cathode and all phenyl complex (APC) as electrolyte are identified by quantitative kinetics analysis as a combination of diffusion-controlled reactions involving ether solvents (esols) and capacitive processes. During magnesiation, esols in APC electrolytes can significantly affect the electrochemical reactions and charge transfer resistances at the electrode/electrolyte interface and thus govern the charge storage properties of the MEGO cathode. In APC