Irreversible lithium storage during lithiation of amorphous silicon thin film electrodes studied by in-situ neutron reflectometry
| Autor: | Michael Horisberger, Harald Schmidt, Jochen Stahn, Erwin Hüger, Bujar Jerliu |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Amorphous silicon
In situ Materials science Renewable Energy Sustainability and the Environment Analytical chemistry Energy Engineering and Power Technology chemistry.chemical_element 02 engineering and technology Neutron scattering 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Anode chemistry.chemical_compound chemistry Electrode Thin film electrode Lithium Neutron reflectometry Electrical and Electronic Engineering Physical and Theoretical Chemistry Composite material 0210 nano-technology |
| Zdroj: | Journal of Power Sources. 359:415-421 |
| ISSN: | 0378-7753 |
| DOI: | 10.1016/j.jpowsour.2017.05.095 |
| Popis: | Amorphous silicon is a promising high-capacity anode material for application in lithium-ion batteries. However, a huge drawback of the material is that the large capacity losses taking place during cycling lead to an unstable performance. In this study we investigate the capacity losses occurring during galvanostatic lithiation of amorphous silicon thin film electrodes by in-situ neutron reflectometry experiments for the first ten cycles. As determined from the analysis of the neutron scattering length density and of the film thickness, the capacity losses are due to irreversible storage of lithium in the electrode. The amount of stored lithium increases during cycling to 20% of the maximum theoretical capacity after the 10th cycle. Possible explanations are discussed. |
| Databáze: | OpenAIRE |
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