Journal
JOURNAL OF SOLID STATE ELECTROCHEMISTRY
Volume 16, Issue 4, Pages 1447-1452Publisher
SPRINGER
DOI: 10.1007/s10008-011-1467-8
Keywords
Sol-gel; Solid-state reaction; Li/O-2; Catalytic activity
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Funding
- Natural Science Foundation of China [20873032]
- Science and Technology Commission of Shanghai Municipality [08DZ2270500]
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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/O-2 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 A degrees C, whereas for solid-state reaction method it can only be synthesized above 1,200 A degrees C. The as-prepared nano-sized La0.8Sr0.2MnO3 has a specific surface area of 32 m(2) g(-1), which is much larger than the solid-state one (1 m(2) 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.
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