The reporter learned from the University of Science and Technology of China that Prof. Ma Cheng ’s group at the school directly observed a peculiar aperiodic structure using spherical aberration corrected transmission electron microscopy. Although the structure is only one atom thick, it can produce lithium Significantly affected, thus becoming another type of non-periodic structure that needs to be closely watched by researchers of solid-state lithium batteries in addition to grain boundaries and point defects. The research results have recently been published in the international academic journal Nature.
All-solid-state lithium batteries have become the focus of current battery research because of their safety and high energy density. The key to successfully constructing this battery is to find a suitable solid electrolyte. In order to design a solid electrolyte with high ionic conductivity in a targeted manner, it is necessary to fully understand the lithium ion transport mechanism.
The researchers observed the classic solid-state electrolysis by spherical aberration corrected transmission electron microscopy. The researchers found a large number of monoatomic layer defects, and these defects formed a closed loop with each other. Comprehensive analysis shows that although these defects are only one atomic layer thick, its special atomic configuration can completely prevent lithium ions from passing through. When these defects combine with each other to form a closed loop, the lithium ions in the enclosed volume will not be able to escape, and the lithium ions outside it will not be able to enter, making this part of the material essentially unable to participate in ion transport. Electron microscopy observations have confirmed that this phenomenon exists in a large amount in the sample, and the ionic conductivity of this solid electrolyte will therefore decrease by about 1-2 orders of magnitude. The researchers named this unique non-periodic structure "single-wall lithium well". If the formation of single-wall lithium traps can be reduced or even avoided, the ionic conductivity will be significantly improved. (Reporter Wu Changfeng)
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