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Researchers detail impact of humidity on Li-air battery performance

Researchers at Fudan University (Shanghai, China) report that while humidity is a strong capacity enhancer for Li–O2 batteries, it limits the cyclic ability and rate performance. A paper on their work appears in the Journal of Power Sources.

In their study, they compared the performance of Li–O2 batteries in pure/dry O2; pure O2 with a relative humidity (RH) of 15%; and ambient air with an RH of 50%, and then analyzed the ambient humidity effect on the reactions in the carbon-based catalytic electrode.

Electrochemical investigation indicates that discharge capacities of Li–O2 batteries increased with growth of RH value, but cyclic ability and rate performance are influenced in an opposite way. Ex-situ X-ray diffraction (XRD), Fourier transform-infrared spectrophotometer (FT-IR) and scanning electron microscope (SEM) investigations suggest that ambient humidity affects not only the Li2O2/O2 conversion, LiCO3/CO2 conversion and LiOH formation but also the morphology of discharge products in porous catalytic electrode over charge/discharge cycle. These results may be important for developing Li–air battery.

—Guo et al.


  • Ziyang Guo, Xiaoli Dong, Shouyi Yuan, Yonggang Wang, Yongyao Xia (2014) “Humidity effect on electrochemical performance of Li–O2 batteries” Journal of Power Sources, Volume 264, Pages 1-7, doi: 10.1016/j.jpowsour.2014.04.079



This is typical studies done by dangeurous madscientists paid by goverments. Please stop subsidizing batteries, there is no more improvements to be have. Start the hydrogen infrastructure now with hydrogen been done by efficient water electrolysis. Im sick and tired of repeating it everyday. It should have been done 10 years ago, since that time I lost many tousands of dollars on costly polluting gasoline. Imagine then the folks that have f-150 or other suv and that drive fast and far from where they live.

Pollution is not a statistic, it is cumulative and only trees depollute the air. If ever we stop pollution with one miracle then it will take 50+ years before seeing the results. Only hydrogen can provide heat and transport in a sustainable way for the future. Batteries, even with an increase in capacity cannot provide transportation because of long recharge time and more then 50% of the peoples don't have a dedicated parking spot to recharge so even these lithium air batteries are a no go.

Roger Pham

Lithium-air has a long way to go, while H2-FC is already here!

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