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Jezowski, P., Fic, K., Crosnier, O., Brousse, T. & Beguin, F. (2016) Lithium rhenium(VII) oxide as a novel material for graphite pre-lithiation in high performance lithiumion capacitors. J. Mater. Chem. A, 4 12609–12615.
Added by: Richard Baschera (2016-10-06 14:25:36) Last edited by: Richard Baschera (2016-10-07 09:25:14) |
| Type de référence: Article DOI: 10.1039/c6ta03810g Numéro d'identification (ISBN etc.): 2050-7488 Clé BibTeX: Jezowski2016a Voir tous les détails bibliographiques  |
Catégories: INTERNATIONAL, ST2E Mots-clés: Anode, batteries, cell, devices, electrolyte, hybrid electrochemical capacitor, ion capacitors, principles, Supercapacitor Créateurs: Beguin, Brousse, Crosnier, Fic, Jezowski Collection: J. Mater. Chem. A |
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The electrochemical reversibility of lithium extraction from lithium rhenium oxide (Li5ReO6, LReO) has been studied using standard 1 mol L-1 LiPF6 in EC/DMC electrolyte. An irreversible capacity of 410 mA h g(-1) was observed below 4.3 V vs. Li/Li+ (close to the total theoretical capacity of 423 mA h g(-1)). Owing to this huge irreversible capacity, LReO could be included as a sacrificial material in the positive activated carbon electrode of a lithium-ion capacitor (LIC) to be used for pre-lithiating the graphite negative electrode. After the pre-lithiation step, the hybrid lithium-ion capacitor constituted of Li doped graphite and activated carbon as negative and positive electrodes, respectively, was cycled at current densities from 0.25 A g(-1) to 0.65 A g(-1). The LIC system demonstrated excellent capacitance stability up to 5000 cycles in the voltage range 2.2-4.1 V. The energy and power densities calculated per total mass of both electrodes reached 40 W h kg(-1) and 0.5 kW kg(-1), respectively. Hence, by using LReO, the prelithiation of graphite can be considerably simplified in comparison to traditional LIC systems, while enabling safer operating conditions owing to the absence of metallic lithium.
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