Oct, 2016
Bio-inspired 2-line ferrihydrite as a high-capacity and high-rate-capability anode material for lithium-ion batteries
JOURNAL OF POWER SOURCES
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- Volume
- 328
- Number
- First page
- 503
- Last page
- 509
- Language
- English
- Publishing type
- DOI
- 10.1016/j.jpowsour.2016.08.037
- Publisher
- ELSEVIER SCIENCE BV
A high-capacity and high-rate-capability anode material for lithium-ion batteries, silicon-doped iron oxyhydroxide or 2-line ferrihydrite (2Fh), was prepared by mixing iron nitrate powder, tetraethyl orthosilicate, 2-propanol, and ammonium hydrogen carbonate powder at room temperature. The design of this material was inspired by a bacteriogenic product, a nanometric amorphous iron-based oxide material containing small amounts of structural Si. The atomistic structure of the prepared Si-doped 2Fh was strongly affected by the Si molar ratio [x = Si/(Fe + Si)]. Its crystallinity gradually decreased as the Si molar ratio increased, with a structural variation from nanocrystalline to amorphous at x = 0.25. The sample with x = 0.20 demonstrated the best Li storage performance. The developed material exhibited a high capacity of similar to 400 mAh g(-1) at the 25th cycle in the voltage range of 0.3-3.0 V and at a current rate of 9 A g(-1), which was three times greater than that of the Si-free 2Fh. This indicates that Si-doping into the 2Fh structure realizes good rate capability, which are presumably because of the specific nanocomposite structure of iron-based electrochemical centers embedded in the Si-based amorphous matrix, generated by reversible Li insertion/deinsertion process. (C) 2016 Elsevier B.V. All rights reserved.
- Link information
- ID information
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- DOI : 10.1016/j.jpowsour.2016.08.037
- ISSN : 0378-7753
- eISSN : 1873-2755
- Web of Science ID : WOS:000383293400055