Synthesis and electrochemical performance of lithium silicide based alloy anodes for Li–ion oxygen batteries
| Autor: | Mustafa Anik, Ersu Lökçü |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Materials science
Renewable Energy Sustainability and the Environment Alloy Energy Engineering and Power Technology chemistry.chemical_element 02 engineering and technology Electrolyte engineering.material 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics Electrochemistry 01 natural sciences 0104 chemical sciences Anode chemistry.chemical_compound Fuel Technology chemistry Chemical engineering Silicide engineering Lithium 0210 nano-technology Polarization (electrochemistry) Faraday efficiency |
| Zdroj: | International Journal of Hydrogen Energy. 46:10624-10631 |
| ISSN: | 0360-3199 |
| DOI: | 10.1016/j.ijhydene.2020.12.179 |
| Popis: | Li–air batteries receive significant attention due to their theoretical energy density values. However, the large implementation of the Li–air batteries is hindered by the use of metallic Li anode which leads to the low coulombic efficiency and safety problems. Therefore, finding alternatives to the metallic Li anodes is extremely important to realize the high energy density Li–air batteries. In this study, Li22Si5 and Li13Si4 alloys are synthesized by the mechanical alloying and their electrochemical performances as the anode material are observed in 1 M LiTFSI-DME:EC (95:5 vol%) electrolyte. XRD analyses following the discharge/charge measurements show that the formation of the charge products (LixSiy phases) is directly affected by the initial alloy anode stoichiometry. The approximate specific energy density of the assembled Li–ion oxygen batteries, which is alternative description of the Li–air batteries when the metallic Li anode is replaced by the alloy anode, is 1840 W h kg−1 under fixed capacity condition (800 mA h g−1) at 100 mA g−1 current density. The working voltage of the cell is at around 2.3 V. This study indicates that the lithium silicide alloy anodes, as the alternatives to the metallic Li anodes, are highly promising to develop Li-ion oxygen batteries with higher coulombic efficiency and lower polarization values. |
| Databáze: | OpenAIRE |
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