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Hanna, O., Malka, D., Luski, S., Brousse, T. & Aurbach, D. (2019) Aqueous Energy Storage Device Based on LiMn2O4 (Spinel) Positive Electrode and Anthraquinone-Modified Carbon-Negative Electrode. Energy Technology, UNSP 1900589.
Added by: Richard Baschera (2019-09-17 13:40:35) Last edited by: Richard Baschera (2019-09-17 13:50:28) |
| Type de référence: Article DOI: 10.1002/ente.201900589 Clé BibTeX: Hanna2019 Voir tous les détails bibliographiques  |
Catégories: INTERNATIONAL, ST2E Créateurs: Aurbach, Brousse, Hanna, Luski, Malka Collection: Energy Technology |
Consultations : 1/368
Indice de consultation : 4% Indice de popularité : 1% |
| Résumé |
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This article describes the design and tests of aqueous hybrid energy-storage devices based on activated carbon-negative electrode and LiMn2O4 (spinel) positive electrode. For this study, activated carbons from two different sources are selected and are further improved by grafting with electroactive anthraquinone molecules. The electrolyte solution is aqueous 1 m Li2SO4 with pH = 7.5. The performances of balanced hybrid devices are characterized by cyclic voltammetry and galvanostatic measurements. It is possible to charge the hybrid cells up to 1.5 V and cycle them with current densities of 40 mA g(-1) (mass of positive electrode). These fully balanced cells can achieve thousands of cycles with capacities up to 75 mAh g(-1). Preliminary calculations predict that such devices may reach energy density approaching 35 Wh kg(-1) (total mass of active materials in both electrodes). Herein, a model of "rocking chair"-type hybrid systems, comprising carbon anodes with amplified capacity, in which the electrolyte solution can serve as a thin layer of ion carrier, is presented. It is believed that the concept may be extended to the more important Na ions hybrid cells. Such systems may be suitable for load-leveling applications and large stationary energy-storage devices operating with very safe aqueous electrolyte solutions.
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