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Structure and Ionic Conductivity of Polystyrene-block-poly(ethylene oxide) Electrolytes in the High Salt Concentration Limit

Chintapalli, Mahati ; Le, Thao N. P ; Venkatesan, Naveen R ; Mackay, Nikolaus G ; Rojas, Adriana A ; Thelen, Jacob L ; Chen, X. Chelsea ; Devaux, Didier ; Balsara, Nitash P

Macromolecules, 2016-03, Vol.49 (5), p.1770-1780 [Periódico revisado por pares]

United States: American Chemical Society

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  • Título:
    Structure and Ionic Conductivity of Polystyrene-block-poly(ethylene oxide) Electrolytes in the High Salt Concentration Limit
  • Autor: Chintapalli, Mahati ; Le, Thao N. P ; Venkatesan, Naveen R ; Mackay, Nikolaus G ; Rojas, Adriana A ; Thelen, Jacob L ; Chen, X. Chelsea ; Devaux, Didier ; Balsara, Nitash P
  • Assuntos: Chemical Sciences ; Material chemistry ; MATERIALS SCIENCE ; Polymers
  • É parte de: Macromolecules, 2016-03, Vol.49 (5), p.1770-1780
  • Notas: AC02-05CH11231
    USDOE Office of Science (SC)
  • Descrição: We explore the relationship between the morphology and ionic conductivity of block copolymer electrolytes over a wide range of salt concentrations for the system polystyrene-block-poly­(ethylene oxide) (PS-b-PEO, SEO) mixed with lithium bis­(trifluoro­methane­sulfonyl)­imide salt (LiTFSI). Two SEO polymers were studied, SEO(16–16) and SEO(4.9–5.5), over the salt concentration range r = 0.03–0.55. The numbers x and y in SEO­(x–y) are the molecular weights of the blocks in kg mol–1, and the r value is the molar ratio of salt to ethylene oxide moieties. Small-angle X-ray scattering was used to characterize morphology and grain size at 120 °C, differential scanning calorimetry was used to study the crystallinity and the glass transition temperature of the PEO-rich microphase, and ac impedance spectroscopy was used to measure ionic conductivity as a function of temperature. The most surprising observation of our study is that ionic conductivity in the concentration regime 0.11 ≤ r ≤ 0.21 increases in SEO electrolytes but decreases in PEO electrolytes. The maximum in ionic conductivity with salt concentration occurs at about twice the salt concentration in SEO (r = 0.21) as in PEO (r = 0.11). We propose that these observations are due to the effect of salt concentration on the grain structure in SEO electrolytes.
  • Editor: United States: American Chemical Society
  • Idioma: Inglês
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