Post-annealing effects on the electrochemical performance of a Si/TiSi2 heteronanostructured anode material prepared by mechanical alloying
Autor: | Taeg-Woo Lee, Sung-Hwan Lim, Sung-Man Lee, Min-Seon Shin, Jung-Bae Park |
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Rok vydání: | 2017 |
Předmět: |
Materials science
Renewable Energy Sustainability and the Environment Annealing (metallurgy) 020209 energy Metallurgy Energy Engineering and Power Technology 02 engineering and technology 021001 nanoscience & nanotechnology Microstructure Nanocrystalline material Anode Amorphous solid Crystal chemistry.chemical_compound chemistry Transmission electron microscopy Silicide 0202 electrical engineering electronic engineering information engineering Electrical and Electronic Engineering Physical and Theoretical Chemistry Composite material 0210 nano-technology |
Zdroj: | Journal of Power Sources. 344:152-159 |
ISSN: | 0378-7753 |
DOI: | 10.1016/j.jpowsour.2017.01.128 |
Popis: | A change in the microstructure of Ti-Si alloys synthesized by high-energy mechanical milling through post-annealing significantly enhances their electrochemical performances as anode materials for lithium-ion batteries (LIBs). The microstructures of ball-milled and post-annealed powders are investigated using high-resolution transmission electron microscopy (HR-TEM). The Si phase is uniformly distributed on the silicide (TiSi2) matrix. The individual Si domains of the mechanical alloying (MA) sample consist of amorphous and crystalline regions with a diffuse interface between the two phases. When MA powder is annealed at 600 °C, the Si phase has a well-developed nanocrystalline microstructure: a multi-grain structure with random orientation of nanometric crystal domains. Annealing at 600 °C causes a significant improvement in electrochemical performance parameters like cycling stability and rate capability. However, when annealed at 800 °C, the electrochemical performances deteriorate due to an increase in the size of Si domains. |
Databáze: | OpenAIRE |
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