Ion diffusion across a disorder-to-order phase transition in a poly(ethylene oxide)-b-poly(silsesquioxane) block copolymer electrolyte

Timachova, Ksenia; Sethi, Gurmukh K.; Bhattacharya, Rajashree; Villaluenga, Irune; Balsara, Nitash P.

doi:10.1039/c8me00077h

Title: Ion diffusion across a disorder-to-order phase transition in a poly(ethylene oxide)-b-poly(silsesquioxane) block copolymer electrolyte

Journal Article · 21 February 2019 · Molecular Systems Design & Engineering

DOI: https://doi.org/10.1039/c8me00077h · OSTI ID:1604678

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Univ. of California, Berkeley, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Univ. of California, Berkeley, CA (United States)
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)

Nanostructured block copolymer electrolytes composed of organic and inorganic moieties have the potential to enable solid-state batteries. Practical uses of these materials, however, require an understanding of the microscopic and macroscopic ion transport properties across the microphase-separated systems. The self-diffusion of salt ions across a disorder-lamellar phase transition in a nanostructured poly(ethylene oxide)-b-poly(silsesquioxane) copolymer was studied using pulsed-field gradient NMR (PFG-NMR) and changes in the morphology were studied using small-angle X-ray scattering. The diffusion of the salt is isotropic when the polymer electrolyte is disordered and locally anisotropic when the polymer is microphase separated. The difference between the diffusion coefficient parallel to the lamellae, D_∥, and the diffusion coefficient perpendicular to the lamellae, D_⊥, measured using PFG-NMR, increases with increasing segregation strength. Finally, the anisotropy of diffusion parallels changes in the morphology measured by small-angle X-ray scattering.

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Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)

Grant/Contract Number:: AC02-05CH11231; AC02-06CH11357

OSTI ID:: 1604678

Journal Information:: Molecular Systems Design & Engineering, Journal Name: Molecular Systems Design & Engineering Journal Issue: 2 Vol. 4; ISSN 2058-9689; ISSN MSDEBG

Publisher:: Royal Society of ChemistryCopyright Statement

Country of Publication:: United States

Language:: English

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