The University of Science and Technology of China is located in China.
Li-O 2 batteries have a high energy density. The performance of the Li-O 2 battery can be affected by the generation and disintegration of the discharged product. Questions regarding the trend and contributing factor of internal Li 2 O 2's change in form and size have not been answered by previous research.
A team led by Prof. Tan Peng from the University of Science and Technology of China designed a carbon-coated anodic aluminum oxide (C-AAO) air electrode with a highly ordered, array-like structure. The team gained new information about Li-O 2 batteries. It was published in a journal.
A special C-AAO electrode was designed by the research team that breaks easily yet preserves the distribution of products. The contributing factor to sudden voltage drop and death was determined using theEIS.
At small currents, the growth of toroidal Li 2 O 2 is restricted due to channel diameter. The sudden death in voltage is caused by a large charge transfer impedance. The sudden death is caused by the less significant charge transfer impedance and concentration polarization.
In order to find the mechanism of such reactions, the research team carried out detailed analysis on the growth model of Li 2 O 2 on the end surfaces. The end surfaces have Li 2 O 2 on them.
An incomplete ring is formed when the most common one growshugging the wall. The rest can either be grown on the surface or in the form of a nucleus. As current density increases, toroidal Li 2 O 2 inside the electrode is likely to be covered by its Flocculated counterparts, indicating that Li 2 O 2 is produced along the surfaces of the electrode.
The team proposed a new growth route for toroidal Li 2 O 2, in which Li 2 O 2 formed at the Li 2 O 2 interface during early growth is related to the surface route.
The answers to long-standing questions regarding the mechanism of Li-O 2 batteries were given by this research.
More information: Zhuojun Zhang et al, Reacquainting the Sudden-Death and Reaction Routes of Li–O2 Batteries by Ex Situ Observation of Li2O2 Distribution Inside a Highly Ordered Air Electrode, Nano Letters (2022). DOI: 10.1021/acs.nanolett.2c02516 Journal information: Nano Letters Provided by University of Science and Technology of China
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