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A “doubting Thomas”
I found that the New University in Lisbon, Portugal had done a great deal of research and development of paper thin-film batteries constructed on cellulose paper used simultaneously as an electrolyte, separating electrodes, and a physical support of a rechargeable battery. As a matter of fact, a 3 V prototype was able to control the on/Off state of a paper transistor.
Then Purdue University, in 2013, created Lithium-ion batteries using flexible paper-based current collectors. The current collectors were fabricated from wood microfibers coated with carbon nanotubes (CNT) through an electrostatic layer-by-layer nanoassembly process.
So, OK—it can be done. Now I was interested in The Paper Battery Company’s design.
The Paper Battery Company process
The company’s PowerPatch™ product line consists of ultrathin, patternable ultracapacitor devices with interconnects and packaging designed to make compact energy modules with operating voltages ranging from 2V – 7.8V depending on the desired life time.
This first generation product implements a limited subset of the PowerWrapper™ technology platform and highlights the packaging innovation developed by the company for this next generation of ultrathin, patternable, ultracapacitors.
As a bonus, this design is an environmentally friendly product: Ultracapacitor technology uses electrodes composed of high surface area activated carbon, carbon nanotubes or graphene. Paper or other porous polymer separators hold the electrolyte and separate the electrodes. Current collectors, usually aluminum foil, attach to the electrodes and carry the charges in and out. The PowerPatch™ products do not have the often-toxic heavy metals typically found in batteries and are RoHS compliant.
