Influence of Separator and Electrode Thickness on Cell Resistance in Energy Storage Devices based on Polypyrrole-Cellulose Composites
2014 (English)In: MRS Spring meeting April 21-25, 2014 - San Francisco, California, 2014Conference paper, Poster (Other academic)
At present there is a strong need for the development of inexpensive, flexible, light-weight and environmentally friendly energy storage devices . In this process, research is carried out to develop new versatile and flexible electrode materials as a complement to the materials used in contemporary batteries and supercapacitors. These activities have resulted in an increased interest in electronically conducting polymers (e.g. polyaniline, polypyrrole, and polythiophene) as it is known since more than two decades [2, 3] that these materials can be used to manufacture all-polymer-based batteries and supercapacitors. However, the latter devices generally suffer from problems due to low capacities, slow charging rates, poor cycling stabilities and high self-discharge rates . Possible approaches to circumvent at least some of these problems involve the use of conducting polymers with carbon nanotubes  or cellulose .
We have recently shown , that flexible composites, made of cellulose and polypyrrole, by chemical polymerization of pyrrole on a cellulose substrate derived from the Cladophora sp. algae, can be used as paper-based electrode materials for environmental friendly charge storage devices. The device, which has been referred to as the “Salt and Paper Battery” , was found to exhibit good cycling stability even at high charging and discharging rates. The latter results open up to exciting possibilities for the development of green and foldable devices as well as for a range of new applications, incompatible with conventional batteries and supercapacitors.
The poster will focus on the results of our recent and ongoing research concerning polypyrrole and cellulose composite charge storage devices. It will be shown how the total cell resistances in the devices are influenced by thickness of the polypyrrole and cellulose composite, the thickness of the separator, and additives in the composite. Furthermore, the influence of the porosity of the separator, and the contact resistances between current collectors and the composite will be briefly discussed. It will be shown that a cheap all organic energy storage device can be assembled with promising performance.
Place, publisher, year, edition, pages
Research subject Engineering Science with specialization in Nanotechnology and Functional Materials
IdentifiersURN: urn:nbn:se:uu:diva-237232OAI: oai:DiVA.org:uu-237232DiVA: diva2:767246
MRS Spring meeting April 21-25, 2014 - San Francisco, California