Heat-Treated Metal Phthalocyanine Complex as an Oxygen Reduction Catalyst for Non-Aqueous Electrolyte Li/air Batteries

摘要

In this work we study heat-treated FeCu-phthalocyanine (FeCuPc) complexes as the catalyst for oxygen reduction in non-aqueous electrolyte Li/air cells by supporting the catalyst on a high surface area Ketjenblack EC- 600JD carbon black. It is shown that the resultant FeCu/C catalyst not only accelerates the two-electron reduction of oxygen as 'O2 + 2Li+ +2e Li2O2' but also catalyzes the chemical disproportionation of Li2O2 as '2Li2O2 2Li2O+O2' In Li/air cells, the catalyst reduces polarization on discharge while simultaneously reducing the fraction of Li2O2 in the final discharged products. In a 0.2 mol LiSO3CF3 7:3 (wt.) propylene carbonate (PC)/tris(2,2,2- trifluoroethyl) phosphate (TFP) electrolyte, the Li/air cells with FeCu/C show at least 0.2V higher discharge voltage at 0.2 8722 than those with pristine carbon.