Journal
NANO ENERGY
Volume 50, Issue -, Pages 589-597Publisher
ELSEVIER
DOI: 10.1016/j.nanoen.2018.05.048
Keywords
Silicon; Anode; Porous structure; Nano pores; Micrometer-sized silicon; Li ion batteries
Categories
Funding
- Office of Vehicle Technologies of the U.S. Department of Energy [DEAC02-05CH11231, DEAC02-98CH10886]
- Department of Energy's Office of Biological and Environmental Research
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Porous structured silicon (p-Si) has been recognized as one of the most promising anodes for Li-ion batteries. However, many available methods to synthesize p-Si are difficult to scale up due to their high production cost. Here we introduce a new approach to obtain spherical micrometer-sized silicon with unique porous structure by using a microemulsion of the cost-effective of silica nanoparticles and magnesiothermic reduction method. The spherical micron-sized p-Si particles prepared by this approach consist of highly aligned nano-sized silicon and exhibit a tap density close to that of bulk Si particles. They have demonstrated significantly improved electrochemical stability compared to nano-Si. Well controlled void space and a highly graphitic carbon coating on the p-Si particles enable good stability of the structure and low overall resistance, thus resulting in a Si-based anode with high capacity (similar to 1467 mAh g(-1) at 2.6 A g(-1)), enhanced cycle life (370 cycles with 83% capacity retention), and high rate capability (similar to 650 mAh g(-1) at 11A g(-1)). This approach may also be generalized to prepare other hierarchical structured high capacity anode materials for constructing high energy density lithium ion batteries.
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