Nano-sized La0.8Sr0.2MnO3 as oxygen reduction catalyst in nonaqueous Li/O2 batteries
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Nano-sized La0.8Sr0.2MnO3 prepared by the polyethylene glycol assisting sol–gel method was applied as oxygen reduction catalyst in nonaqueous Li/O2 batteries. The as-synthesized La0.8Sr0.2MnO3 was characterized by X-ray diffraction (XRD), scanning electron microscopy, and Brunauer–Emmet–Teller measurements. The XRD results indicate that the sample possesses a pure perovskite-type crystal structure, even sintered at a temperature as low as 600 °C, whereas for solid-state reaction method it can only be synthesized above 1,200 °C. The as-prepared nano-sized La0.8Sr0.2MnO3 has a specific surface area of 32 m2 g−1, which is much larger than the solid-state one (1 m2 g−1), and smaller particle size of about 100 nm. Electrochemical results show that the nano-sized La0.8Sr0.2MnO3 has better catalytic activity for oxygen reduction, higher discharge plateau and specific capacity.