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Magnesium Polymer Electrolytes Based on the Polycarbonate Poly(2-butyl-2-ethyltrimethylene-carbonate)

[Image: see text] Magnesium electrolytes based on a polycarbonate with either magnesium tetrakis(hexafluoroisopropyloxy) borate (Mg(B(HFIP)(4))(2)) or magnesium bis(trifluoromethanesulfonyl)imide (Mg(TFSI)(2)) for magnesium batteries were prepared and characterized. The side-chain-containing polycar...

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Detalles Bibliográficos
Autores principales: Sundermann, David A., Park, Bumjun, Hirschberg, Valerian, Schaefer, Jennifer L., Théato, Patrick
Formato: Online Artículo Texto
Lenguaje:English
Publicado: American Chemical Society 2023
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10324081/
https://www.ncbi.nlm.nih.gov/pubmed/37426254
http://dx.doi.org/10.1021/acsomega.3c00761
Descripción
Sumario:[Image: see text] Magnesium electrolytes based on a polycarbonate with either magnesium tetrakis(hexafluoroisopropyloxy) borate (Mg(B(HFIP)(4))(2)) or magnesium bis(trifluoromethanesulfonyl)imide (Mg(TFSI)(2)) for magnesium batteries were prepared and characterized. The side-chain-containing polycarbonate, poly(2-butyl-2-ethyltrimethylene carbonate) (P(BEC)), was synthesized by ring opening polymerization (ROP) of 5-ethyl-5-butylpropane oxirane ether carbonate (BEC) and mixed with Mg(B(HFIP)(4))(2) or Mg(TFSI)(2) to form low- and high-salt-concentration polymer electrolytes (PEs). The PEs were characterized by impedance spectroscopy, differential scanning calorimetry (DSC), rheology, linear sweep voltammetry, cyclic voltammetry, and Raman spectroscopy. A transition from classical salt-in-polymer electrolytes to polymer-in-salt electrolytes was indicated by a significant change in glass transition temperature as well as storage and loss moduli. Ionic conductivity measurements indicated the formation of polymer-in-salt electrolytes for the PEs with 40 mol % Mg(B(HFIP)(4))(2) (HFIP40). In contrast, the 40 mol % Mg(TFSI)(2) PEs showed mainly the classical behavior. HFIP40 was further found to have an oxidative stability window greater than 6 V vs Mg/Mg(2+), but showed no reversible stripping-plating behavior in an Mg||SS cell.