H111 リチウム空気電池多孔質電極内の固相析出・溶解in-situ三次元可視化

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  • H111 In-situ 3D visualization of precipitation/dissolution phenomena in a porous electrode of Lithium-air battery

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The great advantage of the aqueous Li-air battery is that the discharge reaction product LiOH is soluble in H_2O; however, LiOHH2_O precipitates in the air-electrode when concentration excesses the solubility. It is considered to cause cell performance degradation, and its mechanism needs to be clarified. In this study, we succeeded to observe precipitation of solid phase on carbon fibers after discharge process and charge/discharge cycle by using a soft X-ray inclined CT. Then, the charge/discharge characteristics suggested that the solid phases degraded cell performance due to the concentration overpotential of O_2. The solid phases did not disappear despite charging because OFT was provided from the bulk before they dissolved.

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