Lithium Powder Electrode As Anode in Lithium-Oxygen Batteries
The Li powder was made by droplet emulsion technique (D.E.T) (the diameter of lithium powder is 10μm). A Li powder was revealed effective to reduce dendrite growing by the previous study of our group. To make the LPE, we loaded 20mg Li powder on the 15 Φ Sus-mesh and pressed 20kgcm-2. To compose the O2 cathode, Poly (vinylidene fluoride) (PVdF), Ketjen black (KB) carbon and MnO2 catalysts were mixed by 2: 4: 4 wt. %. The current collector of O2cathode was Ni foam and punched 14 Φ. The electrolyte was used by a 1M LiTFSI in TEGDME. The morphology of electrode was pictured by field emission scanning electron microscope (FE-SEM).
To estimate the galvanostatically electrochemical properties we analyze the impedance data, voltage profile and cycle data. The rate of current is 100mAg-1 and limited the time at 10 hours in charge and discharge respectively. In voltage profile we check there a stable cycle process until 40cycles. Li powder has much stable interface reaction than Li metal, it can possible to reduce the over potential at the charge/discharge and make good cycle ability. To analyze the morphology and chemical reaction after cycle was estimated by the FE-SEM, TEM, XPS and FT-IR.
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