Reversible Changes in the Grain Structure and Conductivity in a Block Copolymer Electrolyte

Chakraborty, Saheli; Jiang, Xi; Hoffman, Zach J.; Sethi, Gurmukh K.; Zhu, Chenhui; Balsara, Nitash P.; Villaluenga, Irune

doi:10.1021/acs.macromol.0c00466

Reversible Changes in the Grain Structure and Conductivity in a Block Copolymer Electrolyte

Journal Article · Thu Jul 02 00:00:00 EDT 2020 · Macromolecules

DOI:https://doi.org/10.1021/acs.macromol.0c00466· OSTI ID:1775397

^[1]; ^[2]; Hoffman, Zach J. ^[3]; ^[4]; Zhu, Chenhui ^[5]; ^[6]; ^[7]

Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Energy Storage & Distributed Resources Division
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Materials Sciences Division
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Joint Center for Energy Storage Research (JCESR); Univ. of California, Berkeley, CA (United States)
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Materials Sciences Division; Univ. of California, Berkeley, CA (United States)
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Energy Storage & Distributed Resources Division and Joint Center for Energy Storage Research (JCESR); Univ. of California, Berkeley, CA (United States)
Univ. of California, Berkeley, CA (United States)

Here, we study the phase behavior of a triblock organic–inorganic hybrid copolymer, poly(polyhedral oligomeric silsesquioxane)-b-poly(ethylene oxide)-b-poly(polyhedral oligomeric silsesquioxane) (POSS-PEO-POSS)/lithium bis(trifluoromethanesulfonyl)imide (LiTFSI) salt mixture, as a function of temperature. The polymer exhibits a lamellar morphology both in the neat state and in the presence of salt. However, the average grain size increases substantially when the electrolyte is heated above 113 °C. The grain structure of this sample changes reversibly with temperature, that is, smaller grains reappear when the electrolyte is cooled below 113 °C. While annealing block copolymers at high temperatures often leads to an increase in the grain size, this change is generally irreversible. The reason for the reversible change in the grain structure of the POSS-PEO-POSS/LiTFSI electrolyte is discussed. The ionic conductivity of the electrolyte also exhibits reversible changes in this temperature window. Knowledge of the grain structure is crucial for understanding ion transport in nanostructured electrolytes.

View Accepted Manuscript (DOE)

Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS); SLAC National Accelerator Laboratory, Menlo Park, CA (United States). Stanford Synchrotron Radiation Lightsource (SSRL)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE), Transportation Office. Vehicle Technologies Office; USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities Division

Grant/Contract Number:: AC02-05CH11231; AC02-76SF00515

OSTI ID:: 1775397

Journal Information:: Macromolecules, Journal Name: Macromolecules Journal Issue: 13 Vol. 53; ISSN 0024-9297

Publisher:: American Chemical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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