Abstract
A high yield and low-cost high-energy wet ball milling method is used for producing nano-flake Si@SiO2 as an anode material for Li-ion batteries. After a two-step ball milling (coarse milling and fine milling) process, the irregular plate-like micrometric Si (average particle size is 27.4 μm) is fractured into nano-flake Si@SiO2 (average particle size is 154.8 nm) with small crystalline grains and abundant grain boundaries. Due to the significant changes of the prepared nano-flake Si@SiO2 in the surface composition, particle size and crystal structure, the ball milled Si shows better electrochemical performance compared with the as-received micrometric Si. And the fine milled Si shows the best electrochemical properties with a high initial coulombic efficiency of 84.6% and a specific capacity of 1920.4 mA h g-1 at a current density of 100 mA g-1 after 100 cycles.
Original language | English |
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Pages (from-to) | 27-35 |
Number of pages | 9 |
Journal | Journal of Alloys and Compounds |
Volume | 639 |
DOIs | |
State | Published - 17 Jun 2015 |
Keywords
- Anode
- Crystal structure
- High-energy wet ball milling
- Lithium-ion batteries
- Silicon
- Silicon dioxide