Geles Poliméricos como Electrolitos en Baterías Recargables de Aluminio

  1. Álvaro Miguel
  2. Jesús L. Pablos
  3. Teresa Corrales
  4. Ana López-Cudero 1
  5. Gary Ellis
  6. Víctor Gregorio
  7. Nuria García
  8. Pilar Tiemblo
  1. 1 Instituto de Ciencia y Tecnología de Polímeros
    info

    Instituto de Ciencia y Tecnología de Polímeros

    Madrid, España

    ROR https://ror.org/00bzgd159

Journal:
Revista de plásticos modernos: Ciencia y tecnología de polímeros

ISSN: 0034-8708

Year of publication: 2021

Volume: 122

Issue: 769

Type: Article

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Abstract

In the search for solid, and thus safer, electrolytes for aluminium rechargeable batteries, a variety of polymers that allow the preparation of gel-like electrolytes from the deep eutectic solvent (DES) AlCl3:urea at a composition of 1.5:1 (uralumina 150) is studied. The polymers evaluated, with molecular weights of around 100.000 g mol-1 for comparative purposes, were: polyethylene oxide (PEO), poly(ε-caprolactone) (PCL), poly (dimethyl siloxane) (PDMS), poly(vinyl pyrrolidone) (PVP), polyformal (PVF), thermoplastic polyurethanes (TPU), polymethacrylates (PMMA, P(BM-co-MMA)), polyacetates (PVAc) and the elastomer poly(styrene-ethylene-butylene-styrene) (SEBS). Firstly, the gel-like electrolytes were prepared by direct dissolution of each of the polymers in uralumina. Subsequently, the relationship between the chain molecular structure, thermal properties and aggregation state at the mixing temperature of 70 oC, was evaluated and related with the capacity of the polymers to dissolve an gelify in uralumina 150. The electrochemical properties of the electrolytes were evaluated by both cyclic voltammetry and electrochemical impedance spectroscopy. Among all the polymers tested, only PEO, PCL and PDMS can be effectively dissolved in uralumina 150. Among these, only PEO and PDMS, at concentrations below 5 wt%, present both mechanical and electrochemical suitability for the application. . Finally, the molecular structure of uralumina 150 and the polymeric ionogels was described using vibrational spectroscopy together with computational simulations by density functional theory (DFT) calculations

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