High-capacity CVD-grown Ge nanowire anodes for lithium-ion batteries: simple chemical etching approach for oxide removal
- Authors
- Kim, Pangil; Chen, Tao; Song, Seunghyun; Jevasuwan, W.; Lee, Churl Seung; Fukata, N.; Bae, Joonho
- Issue Date
- Jan-2021
- Publisher
- Springer
- Citation
- Journal of Materials Science: Materials in Electronics, v.32, no.2, pp.2103 - 2112
- Journal Title
- Journal of Materials Science: Materials in Electronics
- Volume
- 32
- Number
- 2
- Start Page
- 2103
- End Page
- 2112
- URI
- https://scholarworks.bwise.kr/gachon/handle/2020.sw.gachon/80039
- DOI
- 10.1007/s10854-020-04976-2
- ISSN
- 0957-4522
- Abstract
- We demonstrated high-performance Ge nanowire (NWs) anodes for rechargeable lithium-ion batteries with high-capacity and high coulombic efficiency. The NWs were prepared using a simple chemical vapor deposition (CVD) method, which is favorable for the mass production of electrodes. The unstable oxides of Ge deteriorate the electrochemical characteristics of the batteries made from Ge-based anodes. To resolve the issue of the oxides and enhance the electrochemical performance, the oxides of the NWs were removed efficiently by a simple wet chemical etching method via a 10% HCl (aq) treatment. Transmission electron microscopy and energy-dispersive X-ray spectroscopy elemental mapping verified the removal of oxides. Charge and discharge capacity of the pristine NWs were 833.803 mAhg−1 and 650.63 mAhg−1 at first cycle. In comparison, the charge and discharge capacities after oxide removal were 1064.1 mAhg−1 and 905.6 mAhg−1 under the same conditions. The discharge capacity and coulombic efficiency of the oxide-removed NWs were 39.2% and 7.1% higher than those achieved without oxide removal. The coulombic efficiency of the oxide-removed NWs was higher than that of the pristine NWs (7.1% increase). The NWs were stable over 25 cycles at different C-rates. This approach provides an efficient and practical way to resolve the oxide issue of Ge-based anodes, and high-performance lithium-ion batteries were demonstrated using the oxide-removed NW anodes. This study presents an advance towards the realization of the commercial batteries based on Ge as an active electrode material. © 2021, The Author(s), under exclusive licence to Springer Science+Business Media, LLC part of Springer Nature.
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