Electrode preparation Li-O2 cell assembly and cycling of ATO


ATO-based electrodes are prepared by ultrasonication of 300 mg ATO in isopropanol and subsequent addition of PTFE binder (PTFE micro powder, 3M, USA) with a binder-to-active material ratio of 5/95. The ink is mixed in a planetary orbital mixer (Thinky, USA) for 5 min at 2000 rpm. The solvent is evaporated at room temperature, and the obtained viscous paste is pressed into pre-punched SS meshes of 15 mm Ø using a spatula (SS mesh with quadratic windows of 190 μm edge length and wires of 65 μm diameter, Spörl OHG, Germany). The mesh serves as both a conductive grid and mechanical support. Vulcan carbon-based electrodes are prepared analogously, with a binder-to-active material ratio of 10/90. Coated mesh electrodes with ATO loadings of 23 ± 5 mg/cm2 and carbon loadings of 2.7 ± 0.5 mg/cm2 are dried at 120°C for 12 h in a vacuum glass oven (Büchi, Switzerland) and directly transferred to an Ar-filled glove box (H2O < 0.1 ppm, O2 < 0.1 ppm, Braun, Germany). Li-O2 cells are assembled inside the glove box using an ATO-based cathode (Ø 15 mm), a Li anode (Ø 17 mm), two Celgard C480 separators (Ø 28 mm), and 120 μL of electrolyte. The electrolyte consists of 0.5 M LiTFSI (lithium bis-(trifluoromethane sulfonyl)-imide, Sigma Aldrich, 99.95% metal basis, vacuum dried at 150°C for 24 hours before use) in diglyme (diethylene glycol dimethyl ether, 99.5%, Sigma Aldrich, purified by fractional distillation over metallic sodium, dried over Sylobead MS 564C zeolites (3 Å, Grace Division) and verified to contain < 5 ppm water as determined by Karl Fischer titration (Titroline KF, Schott Instruments, Germany)). Cells are purged with O2 for 60 s and cycled at a rate normalized to the active material's surface area of 0.086 μA/cm2BET. In the case of the formation of a surface film consisting of electrically insulating discharge products, as expected for Li-air cells, the surface accessible to the electrolyte is the capacity-controlling parameter. If you are looking for high quality, high purity, and cost-effective ATO, or if you require the latest price of ATO, please feel free to email contact mis-asia.

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