کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
6466030 | 1422958 | 2017 | 8 صفحه PDF | دانلود رایگان |
- The Bi-NS@C composite has been synthesized via a molten salt method.
- Bi nanoparticles are well-dispersed and incorporated into the carbon matrix.
- The composite boosts the electric conductivity and mass transport of Na+.
- The composite delivers excellent cycle performance for sodium ion battery.
Sodium ion batteries (SIBs) have been considered as a promising cost-effective alternative for grid energy storage for renewable energy sources such as wind- and solar power. In this work, a bismuth nano-spheres and porous carbon composite (Bi-NS@C) is developed via an oleate-oriented dual-phase interfacial reaction and a molten salt calcination process. Materials characterizations suggest that the Bi-NS with a size of 20-30 nm are uniformly distributed in the sponge-like porous carbon network. Such a structure could enable a conductive network, prevent particle aggregation, shorten the ions transportation pathways, accommodate volume change and prevent the collapse of the electrode. As a result, this anode delivers a reversible discharge capacity of 106 mAh gâ1 after even 1000 cycles at 0.2 A gâ1. Even at 2 A gâ1, the specific capacity of the electrode can still retain at â¼110 mAh gâ1. The remarkable electrochemical performance of the Bi-NS@C composite suggests that the as-prepared nanocomposite can simultaneously enhance the Na+ ion conductivity and electronic conductivity in the charge/discharge processes, which offer guidance in anode materials design and synthesis in SIBs.
Journal: Chemical Engineering Journal - Volume 320, 15 July 2017, Pages 300-307