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Electrospun Li(TFSI)@Polyethylene Oxide Membranes as Solid Electrolytes
Author(s) -
Walke Patrick,
Freitag Katharina M.,
Kirchhain Holger,
Kaiser Matthias,
van Wüllen Leo,
Nilges Tom
Publication year - 2018
Publication title -
zeitschrift für anorganische und allgemeine chemie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.354
H-Index - 66
eISSN - 1521-3749
pISSN - 0044-2313
DOI - 10.1002/zaac.201800370
Subject(s) - membrane , materials science , chemical engineering , electrolyte , plasticizer , amorphous solid , dielectric spectroscopy , lithium (medication) , oxide , ethylene oxide , conductivity , polymer chemistry , electrochemistry , polymer , chemistry , organic chemistry , composite material , electrode , medicine , biochemistry , copolymer , engineering , metallurgy , endocrinology
Thin membranes of lithium‐bis(trifluoromethan)sulfonimide@poly (ethylene oxide) (or Li(TFSI)@PEO) were fabricated by electrospinning from acetonitrile solutions of the starting materials at room temperature. Membranes were tested with and without succinonitrile (SN), acting as a plasticizer to enhance the ion mobility in the systems. Our experiments substantiate, that SN does influence the electrochemical performance and physical properties of the membranes. Homogeneous amorphous membranes were only realized for SN‐containing samples, while phase segregation and crystallization occurred for SN‐free representatives. Membranes of different compositions were tested and the optimum molar mixture of PEO:SN:Li(TFSI), in terms of membrane conductivity, was identified as 36:8:1. Conductivities up to up to 2.8 × 10 –4 S · cm –1 were determined by impedance spectroscopy for this membrane. Used as solid electrolytes without the aid of any additional electrolyte in symmetric Li vs. Li cells, a reasonable stability upon Li cycling could be observed. Here we illustrate that electrospun plasticizer‐modified Li(TFSI)@PEO membranes show high conductivities at very low conductive salt concentrations, compared with solution casted or hot pressed representatives. This feature renders these materials as potential candidates for separators in all solid‐state batteries or related energy storage applications.