Scientists at RISE (research institutes of Sweden) have developed a paper battery that in the future can be used to store renewable energy. The battery, which can be built into walls, can potentially make buildings self-sufficient in energy, as well as be used as insulation.
The cellulose-based paper battery or supercapacitor consists of sheets of paper barely one millimetre thick. In order for the paper to be able to store energy, cellulose fibres are mixed with an electroactive material, such as bio-based carbon and an electrically conductive polymer.
Several different layers are screen-printed on aluminium-coated paper, which both acts as electricity and as a barrier against moisture, oxygen and heat. The printed electronic units can be arranged individually. It could also be connected in series or parallel to obtain greater force, such as high voltage or capacitance.