Nanocrystalline silicon embedded in an alloy matrix as an anode material for high energy density lithium-ion batteries
| Autor: | Cheol-Ho Park, Dae Hee Lee, Dong-Won Kim, Sang-Hyung Kim |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Materials science
Silicon Renewable Energy Sustainability and the Environment Alloy Nanocrystalline silicon Energy Engineering and Power Technology Nanoparticle chemistry.chemical_element 02 engineering and technology engineering.material 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Lithium-ion battery 0104 chemical sciences Anode chemistry engineering Lithium Electrical and Electronic Engineering Physical and Theoretical Chemistry Composite material 0210 nano-technology Current density |
| Zdroj: | Journal of Power Sources. 395:328-335 |
| ISSN: | 0378-7753 |
| DOI: | 10.1016/j.jpowsour.2018.05.087 |
| Popis: | The development of electrode materials with high capacity and good cycling stability is a challenging prerequisite for improving the energy density of lithium-ion batteries. In this work, we synthesize silicon nanoparticles embedded in the inactive Al4Cu9, AlFe and TiFeSi2 matrix phases, as an anode material. The silicon alloy material exhibits good high rate performance and delivers a high initial discharge capacity of 1459.3 mAh g−1 with capacity retention of 85.7% after 200 cycles at a current density of 300 mA g−1. The superior cycling performance of the silicon alloy compared to that of micro-sized pure silicon can be attributed to the unique structure of the alloy material. Here, the nano-sized silicon particles reduce the ionic diffusion path length and minimize volume expansion during lithiation, while the inactive matrix phases accommodate volume changes during repeated cycling and provide a continuous electronic conduction pathway to the silicon nanoparticles. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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