High-performance carbon by amorphization and prepotassiation for potassium-ion battery anodes

Authors
Nam, Ki-HunGanesan, VinothChae, Keun HwaPark, 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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