TY  - JOUR
AU  - Dörr, Tobias S.
AU  - Pelz, Alexander
AU  - Zhang, Peng
AU  - Kraus, Tobias
AU  - Winter, Martin
AU  - Wiemhöfer, Hans-Dieter
TI  - An Ambient Temperature Electrolyte with Superior Lithium Ion Conductivity based on a Self-Assembled Block Copolymer
JO  - Chemistry - a European journal
VL  - 24
IS  - 32
SN  - 0947-6539
CY  - Weinheim
PB  - Wiley-VCH
M1  - FZJ-2021-03365
SP  - 8061 - 8065
PY  - 2018
AB  - In searching for polymer-based electrolytes with improved performance for lithium ion and lithium metal batteries, we studied block copolymer electrolytes with high amounts of bis(trifluoromethane)sulfonimide lithium obtained by macromolecular co-assembly of a poly(isoprene)-block-poly(styrene)-block-poly(ethylene oxide) and the salt from tetrahydrofuran. Particularly, an ultra-short poly(ethylene oxide) block of 2100 g mol−1 was applied, giving rise to 2D continuous lamellar microstructures. The macroscopic stability was ensured with major blocks from poly(isoprene) and poly(styrene), which separated the ionic conductive PEO/salt lamellae. Thermal annealing led to high ionic conductivities of 1.4 mS cm−1 at 20 °C with low activation energy and a superior lithium ion transference number of 0.7, accompanied by an improved mechanical stability (storage modulus of up to 107 Pa). With high Li:O ratios >1, we show a viable concept to achieve fast Li+ transport in block copolymers (BCP), decoupled from slow polymer relaxation.
LB  - PUB:(DE-HGF)16
C6  - pmid:29626360
UR  - <Go to ISI:>//WOS:000437268400006
DO  - DOI:10.1002/chem.201801521
UR  - https://juser.fz-juelich.de/record/894713
ER  -