Electrochemical Properties of Lithium Air Secondary Batteries Incorporating Manganese Salen Complex as Soluble Catalyst for Nonaqueous Electrolyte Solutions

抄録

Manganese-containing salen-type complexes of (R,R)-(−)-N,N′-Bis(3,5-di-tert-butylsalicylidene)-1,2-cyclohexanediaminomanganese(III) chloride (MnSl) were examined as a novel soluble catalyst in nonaqueous electrolyte solutions for lithium air secondary batteries (LABs). The LAB cells with MnSl exhibited a larger first discharge capacity and better cycle performance (893 mAh g⁻¹, 738 mAh g⁻¹ up to 10 cycles) than those without MnSl. Attenuated total reflection Fourier transform infrared spectroscopy (ATR-FTIR) conducted during the discharge/charge cycle showed deposition and decomposition of the discharge product, Li₂O₂, on the surface of the air electrode. Cyclic voltammetry results suggested that MnSl promotes the oxygen reduction reaction and oxygen evolution reaction because of its high reactivity with O₂.