Highly promoted solvent-co-intercalation process in pencil graphite anode and Na 3 V 2 (PO 4 ) 3 cathode in full-cell Na-ion battery.

Autor: Subramanyan K; Department of Chemistry, Indian Institute of Science Education and Research (IISER), Tirupati 517507, India., Lee YS; School of Chemical Engineering, Chonnam National University, Gwang-ju 61186, Republic of Korea. Electronic address: leeys@chonnam.ac.kr., Aravindan V; Department of Chemistry, Indian Institute of Science Education and Research (IISER), Tirupati 517507, India. Electronic address: aravind_van@yahoo.com.
Jazyk: angličtina
Zdroj: Journal of colloid and interface science [J Colloid Interface Sci] 2023 Feb 15; Vol. 632 (Pt B), pp. 326-334. Date of Electronic Publication: 2022 Nov 19.
DOI: 10.1016/j.jcis.2022.11.053
Abstrakt: The electrochemical performance of graphite recovered from 6H-pencil with the highest content of SiO 2 is evaluated in both Na-ion half and full-cell assemblies. The concept of sodium co-intercalation into graphite is exploited by fabricating cells with electrolytes based on tetraethylene glycol dimethyl ether (G4) and diethylene glycol dimethyl ether (G2). The capacity at high current rates is maximum when the G2-based electrolyte is used, both in half and full cells, while the capacity retention after high current rates is better in a G4-based system. Upon calculating the capacity contribution, the G2-based system shows prominent capacitance-based charge storage, whereas the G4-based system has a higher contribution from the Faradaic mechanism. The former also shows a faster diffusion mechanism. While G2 based system has higher capacity retention in half-cell, G4 based system has higher capacity retention in full-cell. When G2 is used as the electrolyte solvent, the irreversibility during cycling is high, affecting cell performance. The full cells with G4 and G2 electrolytes show maximum energy/power densities of 33 Wh kg -1 /2.7 kW kg -1 and 23 Wh kg -1 /1.4 kW kg -1 , respectively. Our study shows that the charge storage mechanism can be varied by tuning the electrolyte solvent. This study is the first to explore pencil graphite for sodium-ion storage.
Competing Interests: Declaration of Competing Interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
(Copyright © 2022 Elsevier Inc. All rights reserved.)
Databáze: MEDLINE
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