Caging Silicon Anodes with Graphene

Dean Sigler Announcements, Batteries, Sustainable Aviation 0 Comments

Dr. Yi Cui of Stanford University has expanded the idea of “battery” to include conductive ink on paper, fruit-like clusters of energy-storing capsules, and now, nano-sized graphene cages in which the energy can romp like a hamster in a plastic ball.  He will be on hand at this year’s Sustainable Aviation Symposium on May 6, at the Sofitel San Francisco Bay hotel. His pioneering work with silicon as an electrode material goes back at least ten years, and has focused on overcoming silicon’s two major problems in battery use.  Silicon expands and begins breaking down during repeated charge-discharge cycles.  It reacts with battery electrolyte to form a coating that progressively destroys performance.  The combination of crumbling and coating finally makes the …

Taking Paper Batteries to the Next Level – Origami

Dean Sigler Electric Powerplants, Sustainable Aviation 0 Comments

Almost four years ago, this blog reported on Dr. Yi Cui’s “painted battery,” a method of coating even paper with carbon nanotubes and silver nanowires, with the coated paper being able to store energy. Adding origami to the concept, Arizona State University researchers have folded a paper-based lithium-ion battery and managed to demonstrate a 14-fold increase in areal energy, or energy density per unit of area.  This has serious implications for batteries that can be printed on roll paper and which have the requisite flexibility.  More rigid batteries might crack under the strain, for instance, and achieve negative results from being folded. “’Foldable batteries may be useful for powering devices that have limited space on board,’ coauthor Candace Chan, Assistant …