期刊
NANO LETTERS
卷 14, 期 3, 页码 1164-1171出版社
AMER CHEMICAL SOC
DOI: 10.1021/nl4038592
关键词
N-doped graphene; lithium storage; atomistic origins; high rate capability; high capacity
类别
资金
- International Center for Young Scientists (ICYS), World Premier International (WPI) Research Center on Materials Nanoarchitectonics (MANA), MEXT, Japan
- Grants-in-Aid for Scientific Research [25820336] Funding Source: KAKEN
Distinct from pure graphene, N-doped graphene (GN) has been found to possess high rate capability and capacity for lithium storage. However, there has still been a lack of direct experimental evidence and fundamental understanding of the storage mechanisms at the atomic scale, which may shed a new light on the reasons of the ultrafast lithium storage property and high capacity for GN. Here we report on the atomistic insights of the GN energy storage as revealed by in situ transmission electron microscopy (TEM). The lithiation process on edges and basal planes is directly visualized, the pyrrolic N hole defect and the perturbed solid-electrolyte-interface configurations are observed, and charge transfer states for three N-existing forms are also investigated. In situ high-resolution TEM experiments together with theoretical calculations provide a solid evidence that enlarged edge {0002} spacings and surface hole defects result in improved surface capacitive effects and thus high rate capability and the high capacity are owing to short-distance orderings at the edges during discharging and numerous surface defects; the phenomena cannot be understood previously by standard electron or X-ray diffraction analyses.
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