Segmental Dynamics Measured by Quasi-Elastic Neutron Scattering and Ion Transport in Chemically Distinct Polymer Electrolytes

被引：21

作者：

Mongcopa, Katrina Irene S. ^{[1
]}

Gribble, Daniel A. ^{[1
]}

Loo, Whitney S. ^{[1
]}

Tyagi, Madhusudan ^{[4
,5
]}

Mullin, Scott A. ^{[6
]}

Balsara, Nitash P. ^{[1
,2
,3
]}

机构：

[1] Univ Calif Berkeley, Dept Chem & Biomol Engn, Berkeley, CA 94720 USA

[2] Lawrence Berkeley Natl Lab, Mat Sci Div, Berkeley, CA 94720 USA

[3] Lawrence Berkeley Natl Lab, Joint Ctr Energy Storage Res, Berkeley, CA 94720 USA

[4] NIST, Ctr Neutron Res, Gaithersburg, MD 20899 USA

[5] Univ Maryland, Dept Mat Sci & Engn, College Pk, MD 20742 USA

[6] Seeo Inc, Hayward, CA 94545 USA

来源：

MACROMOLECULES | 2020年 / 53卷 / 07期

基金：

美国国家科学基金会;

关键词：

MOLECULAR-WEIGHT; SPIN-ECHO; CONDUCTIVITY; CHAIN; SALT; RELAXATION; DIFFUSION; COMPLEXES; MECHANISM; MOBILITY;

D O I：

10.1021/acs.macromol.0c00091

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

We investigate the segmental dynamics and ion transport in two chemically distinct polymer electrolytes, poly(2-cyanoethyl acrylate) (PCEA) and poly(ethylene oxide) (PEO), and their mixtures with lithium bis(trifluoromethane)sulfonimide (LiTFSI) salt. Quasi-elastic neutron scattering experiments reveal slow dynamics in PCEA/LiTFSI relative to that in PEO/LiTFSI, translating to monomeric friction coefficients that are orders of magnitude different. In spite of the enhanced salt dissociation in PCEA due to the presence of polar groups, ion transport is largely dominated by the effect of increased monomeric friction in the pure polymer. Conductivity in these systems is quantified through a simple expression combining salt dissociation, the monomeric friction in the pure polymer, and the effect of added salt on the monomeric friction.

引用

页码：2406 / 2411

页数：6

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