Catalytic
Cycle Employing a TEMPO–Anion Complex
to Obtain a Secondary Mg–O<sub>2</sub> Battery
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Abstract
Nonaqueous Mg–O<sub>2</sub> 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–O<sub>2</sub> 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–O<sub>2</sub> battery incorporating acrylate polymer having TEMPO side
units in the cathode shows evidence of being rechargeable