High-performance carbon by amorphization and prepotassiation for potassium-ion battery anodes
- Authors
- Nam, Ki-Hun; Ganesan, Vinoth; Chae, Keun Hwa; Park, Cheol-Min
- Issue Date
- 2021-08-30
- Publisher
- PERGAMON-ELSEVIER SCIENCE LTD
- Citation
- CARBON, v.181, pp.290 - 299
- Abstract
- Rechargeable K-ion batteries (KIBs) have attracted tremendous attention as a replacement for Li-ion batteries because potassium is earth-abundant and inexpensive. Although the formation of K-ion intercalated graphite compounds gives graphite a reasonable capacity, its capacity is insufficient, and its initial Coulombic efficiency (ICE) is low because of the slow kinetics of the large K ion. In this study, to address the shortcomings of graphite anodes for KIBs, we obtained a high-performance C-based anode by a simple, scalable two-step approach of amorphization and prepotassiation of carbon black (CB). CB was amorphized to provide numerous K-ion insertion sites and thus improve the K storage properties. However, the ICE and reversible capacity (RC) remained low. Therefore, to enhance the electrochemical performance, the amorphized CB (a-CB) was prepotassiated. The prepotassiated/amorphized CB showed a high RC (>300 mAh g(-1)) with an extraordinarily high ICE (>100%), high rate capability (255 mAh g(-1) at 1C, 210 mAh g(-1) at 2C), and remarkable cycling stability after 300 cycles at a high rate of 1C. Its electrochemical performance is among the best reported for C-based anode materials for KIBs, which suggests that it is a promising material for next-generation KIB anodes. (C) 2021 Elsevier Ltd. All rights reserved.
- Keywords
- EXPANDED GRAPHITE; COMPOSITE ANODES; RATE CAPABILITY; POROUS CARBON; HARD CARBON; BLACK; LITHIUM; ELECTRODE; STORAGE; PRELITHIATION; EXPANDED GRAPHITE; COMPOSITE ANODES; RATE CAPABILITY; POROUS CARBON; HARD CARBON; BLACK; LITHIUM; ELECTRODE; STORAGE; PRELITHIATION; Potassium-ion batteries; Anode materials; Carbon-based anodes; Amorphization; Prepotassiation
- ISSN
- 0008-6223
- URI
- https://pubs.kist.re.kr/handle/201004/116575
- DOI
- 10.1016/j.carbon.2021.05.041
- Appears in Collections:
- KIST Article > 2021
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