期刊
CARBON
卷 175, 期 -, 页码 585-593出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.carbon.2021.01.006
关键词
Na-ion battery; Anode material; Graphite; Expanded graphite; Interlayer space control; Metallic pillar
资金
- National Research Foundation (NRF) of Korea - Korean government (MSIT) [2019R1C1C1007886, 2019M3D1A2104105, 2018R1A5A1025224]
- Korea Evaluation Institute of Industrial Technology (KEIT) - Korean government (MOTIE) [10077594]
- Korea Evaluation Institute of Industrial Technology (KEIT) [10077594] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
This study presents a synthetic strategy to increase the interlayer distance of graphite by embedding metallic pillars between graphene layers, facilitating Na+ ion intercalation and enhancing battery performance. The reconstructed W-rGO anodes exhibit high capacity and excellent performance, showing great potential for the realization of Na-ion battery technology.
Despite the economic viability and promising potential of Na-ion batteries, their commercialization remains unrealized because of the limited intercalation of Na+ ions into graphite anodes due to the large ionic radius of Na and instability of Na+ ions on the interstitial sites, which result in a poor cell performance. Herein, we report a synthetic strategy for increasing the graphite interlayer distance along c-axis to facilitate the intercalation of Na+ ions by embedding Group VI W metallic pillars between the graphene layers. The strong electrostatic attraction between the positively charged W6+ ions and the negatively charged graphene oxide (GO) layers enables the assembly of the expanded graphite layers by W pillars (W-rGO) via a subsequent chemical reduction. The interlayer spacing of the reconstructed W-rGO increased to 11.1 angstrom, which is three-fold larger than that of graphite (3.34 angstrom). Consequently, the W-rGO anodes delivered an exceptionally high capacity of 678 mAh g(-1) for a Na-ion battery compared with that of a pristine rGO anode (240 mAh g(-1)). Further, we elucidate the structural characteristics and electrochemical reaction mechanisms of the W-rGO anodes. This work presents a simple and effective strategy for developing high-performance carbon-based anode materials for the realization of Na-ion battery technology. (C) 2021 Elsevier Ltd. All rights reserved.
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