Abstract
Various overoxidized poly(1H-pyrrole) (PPy), poly(N-methylpyrrole) (PMePy) or poly(3,4-ethylenedioxythiophene) (PEDOT) membranes incorporated into an acrylate-based solid polymer electrolyte matrix (SPE) were directly electrosynthesized by a two-step in situ procedure. The aim was to extend and improve fundamental properties of pure SPE materials. The polymer matrix is based on the cross-linking of glycerol propoxylate (1PO/OH) triacrylate (GPTA) with poly(ethylene glycol) diacrylate (PEGDA) and lithium bis(trifluoromethanesulfonyl)imide (LiTFSI) as a conducting salt. A self-standing and flexible polymer electrolyte film is formed during the UV-induced photopolymerization of the acrylate precursors, followed by an electrochemical polymerization of the conducting polymers to form a 3D-IPN. The electrical conductivity of the conducting polymer is destroyed by electrochemical overoxidation in order to convert the conducting polymer into an ion-exchange membrane by introduction of electron-rich groups onto polymer units. The resulting polymer films were characterized by scanning electron microscopy, cyclic voltammetry, electrochemical impedance spectroscopy, differential scanning calorimetry, thermal analysis and infrared spectroscopy. The results of this study show that the combination of a polyacrylate-matrix with ion selective properties of overoxidized CPs leads to new 3D materials with higher ionic conductivity than SPEs and separator or selective ion-exchange membrane properties with good stability by facile fabrication.
Highlights
The release of the lithium-ion battery (LIB) in 1991 by the Sony Corporation marked an important milestone towards the development of energy storage systems, especially rechargeable batteries.[1,2] Vast progress has been made since on the improvement of materials and properties that enabled the implementation of the LIB in different markets.[3,4] more and more products from different elds of technology tend to have nowadays LIBs as power sources, for example small portable electronic devices or plug-in electric vehicles, which gained an increase in popularity due to recent climate changes and government incentives.[5,6] The call for environment-friendly power sources is more topical than ever.[7]
We report the preparation of an interpenetrating polymer network via combined in situ UV- and electropolymerization
The experimental results show that the electron-rich groups are introduced onto conducting polymer units during overoxidation treatment and that the conducting polymer was converted into an ion-exchange membrane
Summary
The release of the lithium-ion battery (LIB) in 1991 by the Sony Corporation marked an important milestone towards the development of energy storage systems, especially rechargeable batteries.[1,2] Vast progress has been made since on the improvement of materials and properties that enabled the implementation of the LIB in different markets.[3,4] more and more products from different elds of technology tend to have nowadays LIBs as power sources, for example small portable electronic devices or plug-in electric vehicles (e.g. cars, scooters, buses), which gained an increase in popularity due to recent climate changes and government incentives.[5,6] The call for environment-friendly power sources is more topical than ever.[7] One major criteria is the safety of the integrated battery and its components.[8] The conventional LIB with liquid electrolytes provides a high lithium ion conductivity, but suffers from safety issues that are related to the ammability of organic solvents and decomposition products.[9,10] alternative electrolytes based on polymer matrices without organic
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