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Title: | Synergistic PF6− and FSI− intercalation enables stable graphite cathode for potassium-based dual ion battery | Authors: | Tan, H Zhai, D Kang, F Zhang, B |
Issue Date: | 30-Jun-2021 | Source: | Carbon, 30 June 2021, v. 178, p. 363-370 | Abstract: | Potassium-based dual ion batteries have emerged as promising alternatives to the prevailing lithium-ion batteries due to the advantages in cost and sustainability. Single-anion intercalation into graphite takes place on the cathode side, but it usually delivers a low capacity with poor Coulombic efficiency in potassium-based systems. We demonstrate the performance could be significantly boosted through synergistic dual-anion intercalation of FSI− and PF6−. The presence of PF6− helps the formation of an effective cathode electrolyte interface to allow high anionic stability up to 5.5 V, while FSI− intercalation brings about superior rate capability and long-term cyclic stability. Concurrent intercalation of FSI− and PF6− is tracked by in-situ Raman spectroscopy and ex-situ XRD. It reveals the formation of stage I graphite intercalation compounds (GICs) upon charging, leading to a reversible capacity of over 100 mAh g−1 with an average potential of 4.65 V (vs. K+/K). Furthermore, the graphite-potassium cell delivers an exceptional capacity of 94 mAh g−1 at 0.3 A g−1 and shows capacity retention of 96% after 250 cycles. The strategy provides a novel avenue toward stable dual-ion battery via intercalation chemistry regulation. | Keywords: | Anion intercalation Dual ion batteries Graphite cathode In-situ Raman |
Publisher: | Pergamon Press | Journal: | Carbon | ISSN: | 0008-6223 | EISSN: | 1873-3891 | DOI: | 10.1016/j.carbon.2021.03.027 | Rights: | © 2021 Elsevier Ltd. All rights reserved. © 2021. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/. The following publication Tan, H., Zhai, D., Kang, F., & Zhang, B. (2021). Synergistic PF6− and FSI− intercalation enables stable graphite cathode for potassium-based dual ion battery. Carbon, 178, 363-370 is available at https://doi.org/10.1016/j.carbon.2021.03.027. |
Appears in Collections: | Journal/Magazine Article |
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