Thin film energy storage systems offer the possibility of roll-to-roll processing on flexible substrates by use of different printing techniques, which enables cost-efficient large scale production. By the use of organic radical compounds as electrodes, such devices are able to combine a favorable environmental impact, since they do not rely on rare materials, with superior charging times and discharging power. Furthermore, an all-solid state device architecture is desirable for such devices, since that potentially increases safety and long-life operation significantly – leakage of liquid electrolytes is disabled by design a priori. Approaches for solid state electrolytes include different types of polymer electrolytes, such as dry polymer electrolytes, plasticized polymer salt complexes, gel polymer electrolytes, polymer-in-salt electrolytes and ceramic polymer electrolytes.
In this work we present an all-solid state thin film battery with electrodes based on polymers of organic radicals, such as TEMPO (2,2,6,6-tetramethyl-4-piperidinyl-N-oxyl radical)  and TCAQ (tetracyano-9,10-anthraquinonedimethane) , and an ionic liquid gel electrolyte based on 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide in a PMMA network [3, 4]. Electrodes and electrolyte were deposited out of liquid phase and dried thereafter resulting in a layer stack thickness in total of approximately 1 µm, including the charge collectors. Results on energy and power density as well as charging and discharging behavior will be presented.
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