Highly porous coral-like silicon particles synthesized by an ultra-simple thermal-reduction method
- Authors
- Duc Tung Ngo; Le, Hang T. T.; Xuan-Manh Pham; Jung, Ji-Won; Ngoc Hung Vu; Fisher, John G.; Im, Won Bin; Kim, Il-Doo; Park, Chan-Jin
- Issue Date
- Feb-2018
- Publisher
- ROYAL SOC CHEMISTRY
- Citation
- JOURNAL OF MATERIALS CHEMISTRY A, v.6, no.6, pp.2834 - 2846
- Indexed
- SCIE
SCOPUS
- Journal Title
- JOURNAL OF MATERIALS CHEMISTRY A
- Volume
- 6
- Number
- 6
- Start Page
- 2834
- End Page
- 2846
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/17767
- DOI
- 10.1039/c7ta09042k
- ISSN
- 2050-7488
- Abstract
- Porous Si is considered a potential anode material for next-generation Li-ion batteries (LIBs) because of its high specific capacity, low lithiation/delithiation potential, low cost, and environmental friendliness. In this work, we introduce a simplified Mg-thermal-reduction method for the production of mass-scalable corallike bulk-Si powder with a high surface area (38 m(2) g(-1)), broad pore-size distribution (2-200 nm), and 3-dimensionally (3D) interconnected Si structure for application in LIBs. The porous, coral-like Si electrode delivered a high reversible capacity of 2451 mA h g(-1), corresponding to similar to 70% of the theoretical capacity of Si, at a rate of C/10. After 100 cycles, the porous, coral-like Si electrode maintained a capacity of 1956 mA h g(-1), corresponding to 79.8% of the initial reversible capacity. Importantly, a reasonably high reversible capacity of 614 mA h g(-1) was achieved even at a high rate of 10C. These outstanding results demonstrate that the 3D-networked, porous, coral-like Si powder, synthesized via a NaCl-assisted Mg-thermal-reduction process on a stainless-steel plate over a period of one minute, can be employed as a promising anode material for the next generation of high-energy LIBs.
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