"We need electrolytes that are compatible with both the cathode and anode materials because the ionic liquid used in this work passivates the Mg-metal anode," said Shimokawa. Such a high cyclability could be attributed to the following points: high structural reversibility of the liquid state active material, low solubility of polysulfides into the ionic liquid electrolyte, and high utilization ratio of sulfur due to its adhesion to conductive sulfide particles that form a porous morphology during the synthesis of the composite materials.ĭespite the researchers' progress, several problems remain. This material allowed for a stable cathode performance at 150 for more than 50 cycles. In addition, they revealed that the discharge potential was enhanced by utilizing non-equilibrium sulfur formed by fast charging processes. The researchers achieved the discharge capacity of ~900 mAh/g at a high current density of 1246 mA/g based on the mass of active sulfur. The composite material showed high performance in capacity, potential, cyclability, and rate capability. The liquid-sulfur/sulfide composite materials can be spontaneously fabricated by electrochemically oxidizing metal sulfides, such as iron sulfide, in an ionic liquid electrolyte at 150. Their paper has been published in the Journal of Materials Chemistry A. Shimokawa and Professor Ichitsubo has developed liquid-sulfur/sulfide composite cathodes enabling high-rate magnesium batteries. Now, a research team that included Tohoku University's Dr. But sulfur-based cathodes for MRBs have severe limitations: low electronic conductivity, sluggish Mg diffusion in solid Mg-S compounds, and dissolubility of polysulfides into electrolytes, which results in low-rate capability and poor cyclability. To overcome this, some researchers have explored sulfur-based materials. Yet the slow diffusion of Mg ions inside the oxides poses a serious problem. Like their lithium-ion counterparts, transition metal oxides are the staple cathode materials in MRBs.
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