Operando Measurement of Layer Breathing Modes in Lithiated Graphite
| Autor: | Mohamed A. Koronfel, Carla Molteni, Peter D. Haynes, Kang Wang, Mary P. Ryan, Daisy B. Thornton, Ifan E. L. Stephens, Hossein Yadegari |
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| Přispěvatelé: | Royal Academy Of Engineering |
| Rok vydání: | 2021 |
| Předmět: |
Materials science
Renewable Energy Sustainability and the Environment Intercalation (chemistry) Energy Engineering and Power Technology 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Fuel Technology Chemistry (miscellaneous) Materials Chemistry Breathing Graphite Composite material 0210 nano-technology Layer (electronics) |
| Zdroj: | ACS Energy Letters. :1633-1638 |
| ISSN: | 2380-8195 |
| Popis: | Despite their ubiquitous usage and increasing societal dependence on Li-ion batteries, there remains a lack of detailed empirical evidence of Li intercalation/deintercalation into graphite even though this process dictates the performance, longevity, and safety of the system. Here, we report direct detection and dissociation of specific crystallographic phases in the lithiated graphite, which form through a stepwise staging process. Using operando measurements, LiC18, LiC12, and LiC6 phases are observed via distinct low-frequency Raman features, which are the result of displacement of the graphite lattice by induced local strain. Density functional theory calculations confirm the nature of the Raman-active vibrational modes, to the layer breathing modes (LBMs) of the lithiated graphite. The new findings indicate graphene-like characteristics in the lithiated graphite under the deep charged condition due to the imposed strain by the inserted Li. Moreover, our approach also provides a simple experimental tool to measure induced strain in the graphite structure under full intercalation conditions. |
| Databáze: | OpenAIRE |
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