Anode Material Associated with Polymeric Networking of Triflate Ions Formed on Mg

We have examined anode materials with anions as an ion transport species to solve metal deposition in rechargeable batteries intrinsically. Mg deposition-dissolution tests were conducted using some ionic liquid electrolytes at 60 °C, and a new electrochemical reaction was observed in addition to Mg deposition and dissolution in an electrolyte of Mg­(CF₃SO₃)₂ and <i>N</i>-methyl-N-propylpiperidinium bis­(trifluoromethane sulfonyl)­amide. The reaction was determined to be based on the formation and release of a polymeric network of triflate ions (CF₃SO₃^–) on the Mg metal surface, which suggests a novel anode material with anion carriers. An anion battery is also demonstrated using this phenomenon and incorporating an acrylate polymer with 2,2,6,6-tetramethylpiperidine-oxyl side units in the cathode to provide evidence of the rechargeability by the intermediary anion carrier

Catalytic Cycle Employing a TEMPO–Anion Complex to Obtain a Secondary Mg–O₂ Battery

Nonaqueous Mg–O₂ batteries are suitable only as primary cells because MgO precipitates formed during discharging are not decomposed electrochemically at ambient temperatures. To address this problem, the present study examined the ability of the 2,2,6,6-tetramethylpiperidine-oxyl (TEMPO)–anion complex to catalyze the decomposition of MgO. It was determined that this complex was capable of chemically decomposing MgO at 60 °C. A catalytic cycle for the realization of a rechargeable Mg–O₂ electrode was designed by combining the decomposition of MgO via the TEMPO–anion complex and the TEMPO–redox couple. This work also demonstrates that a nonaqueous Mg–O₂ battery incorporating acrylate polymer having TEMPO side units in the cathode shows evidence of being rechargeable