Structural Dynamics of Strongly Segregated Block Copolymer
Electrolytes
Version 2 2018-03-27, 14:33
Version 1 2018-03-23, 20:04
Posted on 2018-03-27 - 14:33
Polymer
electrolytes are promising materials for high energy density
rechargeable batteries. However, they have low ion transport rates
and gradually lose electrode adhesion during cycling. These effects
are dependent on polymer structure and dynamics. This motivates an
investigation of diblock copolymer electrolyte dynamics. Structural
and stress relaxations have been measured with X-ray photon correlation
spectroscopy (XPCS) and rheology, respectively, as a function of salt
concentration and temperature. The polymer electrolyte studied in
this work is a mixture of poly(styrene-b-ethylene
oxide), SEO, and lithium bistrifluoromethanesulfonimide (LiTFSI).
Results from XPCS experiments showed hyperdiffusive motion for various
lithium salt concentrations and at varying temperatures, which is
indicative of soft glassy materials. This behavior is attributed to
cooperative dynamics. The decay time was a weak, nonmonotonic function
of salt concentration and decreased with increasing temperature, in
an Arrhenius fashion. In contrast, the shear modulus decreased with
increasing salt concentration and increasing temperature. The entanglement
relaxation from rheological measurements followed Vogel–Fulcher–Tammann
behavior. The structural decay time was slower than the entanglement
relaxation time at temperatures above the glass transition temperature,
but they were approximately equal at Tg regardless of salt concentration. This may indicate a fundamental
connection between cooperative structural motion and polymer chain
motion in this material.
CITE THIS COLLECTION
DataCite
3 Biotech
3D Printing in Medicine
3D Research
3D-Printed Materials and Systems
4OR
AAPG Bulletin
AAPS Open
AAPS PharmSciTech
Abhandlungen aus dem Mathematischen Seminar der Universität Hamburg
ABI Technik (German)
Academic Medicine
Academic Pediatrics
Academic Psychiatry
Academic Questions
Academy of Management Discoveries
Academy of Management Journal
Academy of Management Learning and Education
Academy of Management Perspectives
Academy of Management Proceedings
Academy of Management Review
Oparaji, Onyekachi; Narayanan, Suresh; Sandy, Alec; Ramakrishnan, Subramanian; Hallinan, Daniel (2018). Structural Dynamics of Strongly Segregated Block Copolymer
Electrolytes. ACS Publications. Collection. https://doi.org/10.1021/acs.macromol.7b01803
or
Select your citation style and then place your mouse over the citation text to select it.
SHARE
Usage metrics
Read the peer-reviewed publication
AUTHORS (5)
OO
Onyekachi Oparaji
SN
Suresh Narayanan
AS
Alec Sandy
SR
Subramanian Ramakrishnan
DH
Daniel Hallinan
KEYWORDS
lithium salt concentrationsmaterialentanglement relaxation timeX-ray photon correlation spectroscopyion transport ratesdecay timeglass transition temperatureSEOdiblock copolymer electrolyte dynamicspolymer chain motionsalt concentrationSegregated Block Copolymer Electrolytes Polymer electrolytesXPCS