![]() As a result, the batteries which were generally used in applications where their rigidity and their volume were of little importance, are no longer suitable for wearable technologies which will favor their compactness and their flexibility. Indeed, the proliferation of wearable electronic products has highlighted the need for a technological adaptation by the power sources. Indeed, such batteries are seen to be at the heart of the development of portable and flexible electronic systems, renewable energy storage as well as biomedical technologies requiring a source of energy that can adapt and take various forms 2. Among these, a growing interest has been developed in bendable batteries. Research and industry have put a great deal of effort into the development, elaboration and production of new types of batteries with better performance and with specific properties 1. Optimization of the air–cathode could even lead to higher power applications. Together with the reusability of the air–cathode, the battery is a promising route towards a low-cost viable way for wearable power supply for monitoring medical devices with long lifetimes and high specific energies. Mechanical tests revealed a sufficient stretchability of the air–cathode, even after battery discharge, implying an acceptable degree of wearability. The batteries showed high specific energies up to about 3140 Wh kg −1. At a current density of 2.8 mA cm −2, the operating voltage and lifetime dropped considerably, explained by approaching the limiting current density of about 3 mA cm −2, as evidenced by linear sweep voltammetry. Several discharge tests with current densities from 0.25 up to 2.5 mA cm −2 have presented operating lifetimes from 10 h up until over a day. Discharge tests showed operating voltages up to 0.65 V, whereas two batteries in series could deliver up to 1.3 V at a current density of 0.9 mA cm −2 for almost a day, sufficient for monitoring and medical devices. The anode has an acceptable purity and was found to be resistant against self-corrosion. Characterisation tests showed that the ionic liquid did not change the air–cathode chemically, while the electric conductivity increased considerably. It contains an aluminium anode, an electrolyte made of cellulose paper imbibed with an aqueous sodium chloride solution and the PEDOT:PSS air–cathode. Moreover, in view of wearable batteries, these air-cathodes are implemented within a flexible aluminium-air battery. This work presents the development of the air–cathode and the characterization of its physical, chemical and mechanical properties. A hydrogel film, poly-3,4-ethylenedioxythiophene (PEDOT):polystyrenesulfonate (PSS), containing an ionic liquid, is used as an air–cathode for a metal-air battery and its performance is investigated.
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